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runtime: fatal error: self deadlock (webassembly) #35256

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eliasnaur opened this issue Oct 30, 2019 · 1 comment · Fixed by sthagen/golang-go#48
Closed

runtime: fatal error: self deadlock (webassembly) #35256

eliasnaur opened this issue Oct 30, 2019 · 1 comment · Fixed by sthagen/golang-go#48
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arch-wasm WebAssembly issues FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.

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

$ go version
go version devel +5d000a8b62 Sat Oct 26 08:29:23 2019 +0000 linux/amd64

Does this issue reproduce with the latest release?

Yes

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

go env Output
$ go env
GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/elias/.cache/go-build"
GOENV="/home/elias/.config/go/env"
GOEXE=""
GOFLAGS="-mod=readonly"
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/elias/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/home/elias/dev/go-tip"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/home/elias/dev/go-tip/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/var/home/elias/scratch/wasm-deadlock/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-build150620092=/tmp/go-build -gno-record-gcc-switches"
GOROOT/bin/go version: go version devel +5d000a8b62 Sat Oct 26 08:29:23 2019 +0000 linux/amd64
GOROOT/bin/go tool compile -V: compile version devel +5d000a8b62 Sat Oct 26 08:29:23 2019 +0000
uname -sr: Linux 5.3.7-200.fc30.x86_64
/lib64/libc.so.6: GNU C Library (GNU libc) stable release version 2.29.
gdb --version: GNU gdb (GDB) Fedora 8.3-6.fc30

What did you do?

$ cd $(mktmp -d)
$ go mod init deadlock
$ cat > deadlock.go
package main

import (
	"fmt"
	"log"

	"gioui.org/app"
	"gioui.org/io/system"
	"gioui.org/op"
)

func main() {
	go func() {
		w := app.NewWindow()
		if err := loop(w); err != nil {
			log.Fatal(err)
		}
	}()
	app.Main()
}

func loop(w *app.Window) error {
	first := true
	ops := new(op.Ops)
	for {
		e := <-w.Events()
		switch e := e.(type) {
		case system.DestroyEvent:
			return e.Err
		case system.FrameEvent:
			ops.Reset()
			e.Frame(ops)
			fmt.Println("drawing a frame")
			if first {
				w.Invalidate()
				first = false
			}
		}
	}
}
$ go run gioui.org/cmd/gogio -target js -o=out .
$ go run github.com/shurcooL/goexec 'http.ListenAndServe(`:8080`, http.FileServer(http.Dir(`out`)))'

Then, open a browser at http://localhost:8080

What did you expect to see?

No crash on the browser console.

What did you see instead?

On my browser (Firefox):

drawing a frame 2 wasm_exec.js:47:14
fatal error: self deadlock wasm_exec.js:47:14

runtime stack: wasm_exec.js:47:14
runtime: unexpected return pc for syscall.fsCall called from 0x0 wasm_exec.js:47:14
stack: frame={sp:0x1c6b10, fp:0x1c6ba8} stack=[0x1c5038,0x1c6c38) wasm_exec.js:47:14
00000000001c6a10:  00000000001c6a20  0000000011c20007 <runtime.throw+7> wasm_exec.js:47:14
00000000001c6a20:  00000000001c6a28  0000000013450000 <runtime.throw.func1+0> wasm_exec.js:47:14
00000000001c6a30:  00000000000498a9  000000000000000d wasm_exec.js:47:14
00000000001c6a40:  00000000108b000b <runtime.lock+11>  00000000000498a9 wasm_exec.js:47:14
00000000001c6a50:  000000000000000d  00000000105a0008 <runtime.chanrecv+8> wasm_exec.js:47:14
00000000001c6a60:  0000000000410058  0000000000000006 wasm_exec.js:47:14
00000000001c6a70:  0000000000410de0  0000000000400f00 wasm_exec.js:47:14
00000000001c6a80:  000000001092000c <runtime.beforeIdle+12>  0000000000000000 wasm_exec.js:47:14
00000000001c6a90:  00000000004105d8  0000000012140060 <runtime.findrunnable+96> wasm_exec.js:47:14
00000000001c6aa0:  ffffffffffffffff  0000000000000001 wasm_exec.js:47:14
00000000001c6ab0:  0000000000000001  0000000000000000 wasm_exec.js:47:14
00000000001c6ac0:  0000000000000000  0000000000410058 wasm_exec.js:47:14
00000000001c6ad0:  0000000000000000  0000000000000001 wasm_exec.js:47:14
00000000001c6ae0:  0000000010580002 <runtime.chanrecv1+2>  0000000000410000 wasm_exec.js:47:14
00000000001c6af0:  00000000001c6b88  0000000000000001 wasm_exec.js:47:14
00000000001c6b00:  00000000001d2401  000000001681000d <syscall.fsCall+13> wasm_exec.js:47:14
00000000001c6b10: <0000000000410000  00000000001c6b88 wasm_exec.js:47:14
00000000001c6b20:  0000000011f60010 <runtime.casgstatus+16>  0000000100000001 wasm_exec.js:47:14
00000000001c6b30:  0000000100000000  0000000100000001 wasm_exec.js:47:14
00000000001c6b40:  0000000000000000  00000000004105d8 wasm_exec.js:47:14
00000000001c6b50:  0000000000000006  0000000000410000 wasm_exec.js:47:14
00000000001c6b60:  0000000000400f00  00000000001a9c00 wasm_exec.js:47:14
00000000001c6b70:  0000000000000000  0000000000410000 wasm_exec.js:47:14
00000000001c6b80:  000000001218005e <runtime.schedule+94>  0000000000000000 wasm_exec.js:47:14
00000000001c6b90:  0000000000000000  0000000000000000 wasm_exec.js:47:14
00000000001c6ba0: !0000000000000000 >0000000010940000 <runtime.handleAsyncEvent+0> wasm_exec.js:47:14
00000000001c6bb0:  0000000000192b60  0000000012ff0004 <runtime.isSystemGoroutine+4> wasm_exec.js:47:14
00000000001c6bc0:  0000000010940000 <runtime.handleAsyncEvent+0>  00000000001a9c00 wasm_exec.js:47:14
00000000001c6bd0:  0000000000400f90  0000000000000006 wasm_exec.js:47:14
00000000001c6be0:  000000001221002b <runtime.goexit0+43>  0000000000410000 wasm_exec.js:47:14
00000000001c6bf0:  0000000000400f00  0000000000400a00 wasm_exec.js:47:14
00000000001c6c00:  0000000000000000  0000000000000000 wasm_exec.js:47:14
00000000001c6c10:  00000000001a9c00  00000000135f0001 <runtime.mcall+1> wasm_exec.js:47:14
00000000001c6c20:  0000000000400f00  00000000001c6c60 wasm_exec.js:47:14
00000000001c6c30:  0100000000000000 wasm_exec.js:47:14
syscall.fsCall(0x10940000, 0x192b60, 0x12ff0004, 0x10940000, 0x1a9c00, 0x400f90, 0x6, 0x1221002b) wasm_exec.js:47:14
	/home/elias/dev/go-tip/src/syscall/fs_js.go:513 +0xd wasm_exec.js:47:14
wasm_exec.js:47:14
goroutine 1 [chan receive]: wasm_exec.js:47:14
gioui.org/app/internal/window.Main(...) wasm_exec.js:47:14
	/home/elias/proj/gio/app/internal/window/os_js.go:381 wasm_exec.js:47:14
gioui.org/app.Main(...) wasm_exec.js:47:14
	/home/elias/proj/gio/app/app.go:52 wasm_exec.js:47:14
main.main() wasm_exec.js:47:14
	/var/home/elias/scratch/wasm-deadlock/deadlock.go:19 +0x6 wasm_exec.js:47:14
wasm_exec.js:47:14
goroutine 6 [waiting]: wasm_exec.js:47:14
syscall/js.Value.Call(0x7ff800000000000a, 0x48067, 0x5, 0x47e140, 0x6, 0xa, 0x5) wasm_exec.js:47:14
	/home/elias/dev/go-tip/src/syscall/js/js.go:326 +0x3 wasm_exec.js:47:14
syscall.fsCall(0x48067, 0x5, 0x439cf8, 0x5, 0x5, 0x4030000000000001, 0x430b60, 0x41f600) wasm_exec.js:47:14
	/home/elias/dev/go-tip/src/syscall/fs_js.go:496 +0xc wasm_exec.js:47:14
syscall.Write(0x1, 0x41f600, 0x10, 0x10, 0x11e20002, 0x439d80, 0x134b0000) wasm_exec.js:47:14
	/home/elias/dev/go-tip/src/syscall/fs_js.go:417 +0x11 wasm_exec.js:47:14
internal/poll.(*FD).Write(0x42c120, 0x41f600, 0x10, 0x10, 0x0, 0x0, 0x0) wasm_exec.js:47:14
	/home/elias/dev/go-tip/src/internal/poll/fd_unix.go:268 +0x22 wasm_exec.js:47:14
os.(*File).write(...) wasm_exec.js:47:14
	/home/elias/dev/go-tip/src/os/file_unix.go:276 wasm_exec.js:47:14
os.(*File).Write(0x40c020, 0x41f600, 0x10, 0x10, 0x1, 0x18960006, 0x10580001) wasm_exec.js:47:14
	/home/elias/dev/go-tip/src/os/file.go:153 +0xf wasm_exec.js:47:14
fmt.Fprintln(0x6c080, 0x40c020, 0x439ee0, 0x1, 0x1, 0x10, 0x0, 0x0) wasm_exec.js:47:14
	/home/elias/dev/go-tip/src/fmt/print.go:265 +0x8 wasm_exec.js:47:14
fmt.Println(...) wasm_exec.js:47:14
	/home/elias/dev/go-tip/src/fmt/print.go:274 wasm_exec.js:47:14
main.loop(0x450000, 0x0, 0x0) wasm_exec.js:47:14
	/var/home/elias/scratch/wasm-deadlock/deadlock.go:33 +0x18 wasm_exec.js:47:14
main.main.func1() wasm_exec.js:47:14
	/var/home/elias/scratch/wasm-deadlock/deadlock.go:15 +0x3 wasm_exec.js:47:14
created by main.main wasm_exec.js:47:14
	/var/home/elias/scratch/wasm-deadlock/deadlock.go:13 +0x2 wasm_exec.js:47:14
wasm_exec.js:47:14
goroutine 7 [select]: wasm_exec.js:47:14
gioui.org/app.(*Window).run(0x450000, 0x40a080) wasm_exec.js:47:14
	/home/elias/proj/gio/app/window.go:230 +0x8 wasm_exec.js:47:14
created by gioui.org/app.NewWindow wasm_exec.js:47:14
	/home/elias/proj/gio/app/window.go:99 +0x12 wasm_exec.js:47:14
wasm_exec.js:47:14
goroutine 8 [select (no cases)]: wasm_exec.js:47:14
gioui.org/app/internal/window.NewWindow.func2(0x448090) wasm_exec.js:47:14
	/home/elias/proj/gio/app/internal/window/os_js.go:59 +0x10 wasm_exec.js:47:14
created by gioui.org/app/internal/window.NewWindow wasm_exec.js:47:14
	/home/elias/proj/gio/app/internal/window/os_js.go:54 +0x14 wasm_exec.js:47:14
wasm_exec.js:47:14
goroutine 9 [chan send]: wasm_exec.js:47:14
gioui.org/app/internal/gpu.(*GPU).renderLoop.func1(0x460000, 0x6dda0, 0x40a0e0, 0x42e540) wasm_exec.js:47:14
	/home/elias/proj/gio/app/internal/gpu/gpu.go:350 +0xad wasm_exec.js:47:14
created by gioui.org/app/internal/gpu.(*GPU).renderLoop wasm_exec.js:47:14
	/home/elias/proj/gio/app/internal/gpu/gpu.go:259 +0x3
@eliasnaur eliasnaur added the arch-wasm WebAssembly issues label Oct 30, 2019
@mvdan mvdan added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Oct 30, 2019
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Change https://golang.org/cl/204662 mentions this issue: syscall/js: handle interleaved functions correctly

@sthagen sthagen mentioned this issue Nov 23, 2019
Merged
@guregu guregu mentioned this issue Mar 11, 2020
Open
@markus-wa markus-wa mentioned this issue Mar 28, 2020
Closed
@golang golang locked and limited conversation to collaborators Nov 22, 2020
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syscall/js: handle interleaved functions correctly golang/go
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@eliasnaur @mvdan @gopherbot