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internal/fuzz: many data races when fuzzing trivial string input #48307

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bcmills opened this issue Sep 10, 2021 · 2 comments
Closed

internal/fuzz: many data races when fuzzing trivial string input #48307

bcmills opened this issue Sep 10, 2021 · 2 comments
Labels
FrozenDueToAge fuzz Issues related to native fuzzing support NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. release-blocker
Milestone
Go1.18

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@bcmills
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bcmills commented Sep 10, 2021 •
edited

What version of Go are you using (go version)?

$ gotip version
go version devel go1.18-7c648e2ac Thu Sep 9 17:28:03 2021 +0000 linux/amd64

Does this issue reproduce with the latest release?

N/A

What operating system and processor architecture are you using (go env)?

go env Output
$ gotip env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/usr/local/google/home/bcmills/.cache/go-build"
GOENV="/usr/local/google/home/bcmills/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/tmp/tmp.kTefRYzwUx/.gopath/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/tmp/tmp.kTefRYzwUx/.gopath"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/google/home/bcmills/sdk/gotip"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/google/home/bcmills/sdk/gotip/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="devel go1.18-7c648e2ac Thu Sep 9 17:28:03 2021 +0000"
GCCGO="/usr/local/google/home/bcmills/bin/gccgo"
AR="ar"
CC="gcc"
CXX="c++"
CGO_ENABLED="1"
GOMOD="/tmp/tmp.kTefRYzwUx/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build988364609=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Fuzz the following program using gotip test -race -fuzztime=1us -fuzz=.:

package main

import (
	"testing"
)

func FuzzFuzzer(f *testing.F) {
	f.Fuzz(func(t *testing.T, in string) {
	})
}

What did you expect to see?

Ideally, the fuzzer getting cantankerous about how my function doesn't do anything. 😅

But I'd settle for lobbing billions of arbitrary strings at my no-op function without crashing.

What did you see instead?

==================
WARNING: DATA RACE
Read at 0x00000126f97b by goroutine 13:
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:195 +0x38
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f97b by goroutine 12:
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:195 +0x4f
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 13 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f981 by goroutine 13:
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:248 +0x22f
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f981 by goroutine 12:
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:248 +0x246
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 13 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f595 by goroutine 13:
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:88 +0x32
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f595 by goroutine 12:
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:88 +0x49
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 13 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f648 by goroutine 13:
  internal/poll.(*fdMutex).increfAndClose()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:63 +0x32
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:94 +0x64
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f648 by goroutine 12:
  internal/poll.(*fdMutex).increfAndClose()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:63 +0x49
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:94 +0x64
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 13 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f97d by goroutine 14:
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:245 +0x79
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f97d by goroutine 12:
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:245 +0x90
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 14 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f51e by goroutine 14:
  internal/poll.(*fdMutex).increfAndClose()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:74 +0xf6
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:94 +0x64
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f51e by goroutine 12:
  internal/poll.(*fdMutex).increfAndClose()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:74 +0x10d
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:94 +0x64
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 14 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f521 by goroutine 14:
  internal/poll.(*fdMutex).increfAndClose()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:84 +0x1ba
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:94 +0x64
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f521 by goroutine 12:
  internal/poll.(*fdMutex).increfAndClose()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:84 +0x1d1
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:94 +0x64
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 14 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f59a by goroutine 14:
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:94 +0x78
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f59a by goroutine 12:
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:94 +0x8f
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 14 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f59b by goroutine 14:
  internal/poll.(*pollDesc).evict()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_poll_runtime.go:58 +0xda
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:103 +0x100
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f59b by goroutine 12:
  internal/poll.(*pollDesc).evict()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_poll_runtime.go:58 +0xf1
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:103 +0x100
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 14 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f54d by goroutine 14:
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:205 +0x32
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f54d by goroutine 12:
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:205 +0x49
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 14 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f51c by goroutine 13:
  internal/poll.(*fdMutex).increfAndClose()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:72 +0x94
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:94 +0x64
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f51c by goroutine 12:
  internal/poll.(*fdMutex).increfAndClose()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:72 +0xab
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:94 +0x64
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 13 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f526 by goroutine 14:
  internal/poll.(*fdMutex).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:84 +0x32
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:212 +0x64
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f526 by goroutine 12:
  internal/poll.(*fdMutex).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:84 +0x49
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:212 +0x64
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 14 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f520 by goroutine 13:
  internal/poll.(*fdMutex).increfAndClose()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:79 +0x15e
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:94 +0x64
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f520 by goroutine 14:
  internal/poll.(*fdMutex).increfAndClose()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:79 +0x175
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:94 +0x64
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 13 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 14 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f527 by goroutine 15:
  internal/poll.(*fdMutex).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:103 +0x94
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:212 +0x64
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f527 by goroutine 12:
  internal/poll.(*fdMutex).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:103 +0xab
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:212 +0x64
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 15 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f52a by goroutine 13:
  internal/poll.(*fdMutex).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:109 +0x153
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:212 +0x64
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f52a by goroutine 12:
  internal/poll.(*fdMutex).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:109 +0x16a
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:212 +0x64
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 13 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f593 by goroutine 13:
  internal/poll.(*pollDesc).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_poll_runtime.go:49 +0x9a
  internal/poll.(*FD).destroy()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:77 +0x57
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:213 +0xa4
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f593 by goroutine 12:
  internal/poll.(*pollDesc).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_poll_runtime.go:49 +0xb1
  internal/poll.(*FD).destroy()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:77 +0x57
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:213 +0xa4
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 13 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f54e by goroutine 15:
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:212 +0x74
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f54e by goroutine 12:
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:212 +0x8b
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 15 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f592 by goroutine 16:
  internal/poll.(*FD).destroy()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:69 +0x32
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:213 +0xa4
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f592 by goroutine 12:
  internal/poll.(*FD).destroy()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:69 +0x49
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:213 +0xa4
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 16 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f59e by goroutine 13:
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:115 +0x1d8
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f59e by goroutine 12:
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:115 +0x1ef
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 13 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f985 by goroutine 15:
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x484
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f985 by goroutine 12:
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x49b
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 15 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f98b by goroutine 17:
  os.Remove()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:291 +0x3a
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:41 +0x28b
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f98b by goroutine 12:
  os.Remove()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:291 +0x51
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:41 +0x28b
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 17 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f529 by goroutine 14:
  internal/poll.(*fdMutex).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:105 +0xfe
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:212 +0x64
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f529 by goroutine 12:
  internal/poll.(*fdMutex).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:105 +0x115
  internal/poll.(*FD).decref()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_mutex.go:212 +0x64
  internal/poll.(*FD).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/poll/fd_unix.go:107 +0x153
  os.(*file).close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:253 +0x264
  os.(*File).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:26 +0xeb
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:39 +0xb5
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 14 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f98c by goroutine 16:
  os.ignoringEINTR()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:245 +0x9d
  os.Remove()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:301 +0x5f
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:41 +0x28b
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f98c by goroutine 12:
  os.ignoringEINTR()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:245 +0xb4
  os.Remove()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:301 +0x5f
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:41 +0x28b
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 16 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f98f by goroutine 15:
  os.Remove()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:304 +0x1b1
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:41 +0x28b
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f98f by goroutine 12:
  os.Remove()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:304 +0x1c8
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:41 +0x28b
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 15 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
==================
WARNING: DATA RACE
Read at 0x00000126f98d by goroutine 13:
  os.ignoringEINTR()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:247 +0x144
  os.Remove()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:301 +0x5f
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:41 +0x28b
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Previous write at 0x00000126f98d by goroutine 12:
  os.ignoringEINTR()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_posix.go:247 +0x15b
  os.Remove()
      /usr/local/google/home/bcmills/sdk/gotip/src/os/file_unix.go:301 +0x5f
  internal/fuzz.(*sharedMem).Close()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/sys_posix.go:41 +0x28b
  internal/fuzz.(*worker).cleanup()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/worker.go:87 +0x135
  internal/fuzz.CoordinateFuzzing.func3()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:178 +0x10d

Goroutine 13 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47

Goroutine 12 (running) created at:
  internal/fuzz.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/internal/fuzz/fuzz.go:173 +0x83c
  testing/internal/testdeps.TestDeps.CoordinateFuzzing()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/internal/testdeps/deps.go:151 +0x2f3
  testing/internal/testdeps.(*TestDeps).CoordinateFuzzing()
      <autogenerated>:1 +0x12f
  testing.testDeps.CoordinateFuzzing-fm()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/testing.go:1528 +0x14a
  testing.(*F).Fuzz()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:406 +0xa17
  example.FuzzFuzzer()
      /tmp/tmp.kTefRYzwUx/main_test.go:8 +0x6c
  testing.fRunner()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:738 +0x17a
  testing.runFuzzing.func1()
      /usr/local/google/home/bcmills/sdk/gotip/src/testing/fuzz.go:633 +0x47
==================
gathering baseline coverage, elapsed: 0.0s, workers: 12, left: 1
--- FAIL: FuzzFuzzer (0.01s)
PASS
Found 25 data race(s)
exit status 66
FAIL	example	0.042s

CC @jayconrod @katiehockman
@bcmills bcmills changed the title [dev.fuzz] internal/fuzz: many data races when fuzzing with race dete [dev.fuzz] internal/fuzz: many data races when fuzzing trivial string input Sep 10, 2021
@seankhliao seankhliao added fuzz Issues related to native fuzzing support NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels Sep 10, 2021
@katiehockman katiehockman added this to the Go1.18 milestone Sep 14, 2021
@rolandshoemaker rolandshoemaker self-assigned this Sep 15, 2021
@gopherbot
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Change https://golang.org/cl/350369 mentions this issue: [dev.fuzz] internal/fuzz,cmd/compile: don't add race instrumentation to counters

@rsc rsc changed the title [dev.fuzz] internal/fuzz: many data races when fuzzing trivial string input internal/fuzz: many data races when fuzzing trivial string input Sep 21, 2021
@gopherbot
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Change https://golang.org/cl/351453 mentions this issue: internal/fuzz,cmd/compile: don't add race instrumentation to counters

@golang golang locked and limited conversation to collaborators Jun 23, 2023
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FrozenDueToAge fuzz Issues related to native fuzzing support NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. release-blocker
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@rolandshoemaker @bcmills @gopherbot @seankhliao @katiehockman