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cmd/cgo: segfault compiling github.com/jeffjen/datefmt #18126

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petermattis opened this issue Nov 30, 2016 · 4 comments
Closed

cmd/cgo: segfault compiling github.com/jeffjen/datefmt #18126

petermattis opened this issue Nov 30, 2016 · 4 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
Milestone
Go1.8

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@petermattis
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Please answer these questions before submitting your issue. Thanks!

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

~/Development/go/src/github.com/jeffjen/datefmt master ~/Development/go-1.8/bin/go version
go version devel +5d1b53a Wed Nov 30 19:46:00 2016 +0000 darwin/amd64

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

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/pmattis/Development/go"
GORACE=""
GOROOT="/Users/pmattis/Development/go-1.8"
GOTOOLDIR="/Users/pmattis/Development/go-1.8/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/qc/fpqpgdqd167c70dtc6840xxh0000gn/T/go-build720217539=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"

What did you do?

If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.

~/Development/go/src/github.com/jeffjen/datefmt master git rev-parse HEAD
6688647cfa0439b86e09b097cac96ed328d5fa34
~/Development/go/src/github.com/jeffjen/datefmt master ~/Development/go-1.8/bin/go install .
# github.com/jeffjen/datefmt
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0x112be4f]

goroutine 1 [running]:
main.(*Package).rewriteCall(0xc42008c1c0, 0xc4200aa000, 0xc4200bc1b0, 0xc420090b80, 0xc420075350)
	/Users/pmattis/Development/go-1.8/src/cmd/cgo/gcc.go:757 +0x11df
main.(*Package).rewriteCalls(0xc42008c1c0, 0xc4200aa000, 0xc420176000)
	/Users/pmattis/Development/go-1.8/src/cmd/cgo/gcc.go:612 +0x183
main.(*Package).Translate(0xc42008c1c0, 0xc4200aa000)
	/Users/pmattis/Development/go-1.8/src/cmd/cgo/gcc.go:170 +0x146
main.main()
	/Users/pmattis/Development/go-1.8/src/cmd/cgo/main.go:297 +0x868

What did you expect to see?

Success.

What did you see instead?

Failure.

Note this library compiles on go1.7.3.
@bradfitz bradfitz added this to the Go1.8 milestone Nov 30, 2016
@bradfitz bradfitz added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Nov 30, 2016
@bradfitz
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@mdempsky, you like cgo. Can you look?

Or @ianlancetaylor, but I bug Ian a lot.

@ianlancetaylor
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I'm already looking at it. I see the problem.

@gopherbot
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CL https://golang.org/cl/33750 mentions this issue.

@gopherbot
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CL https://golang.org/cl/33752 mentions this issue.

@golang golang locked and limited conversation to collaborators Dec 1, 2017
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@bradfitz @mdempsky @ianlancetaylor @petermattis @gopherbot