cmd/link: panic in deadcode flood

[wangkechun]

Please answer these questions before submitting your issue. Thanks!

1. What version of Go are you using (go version)?
   go version go1.7 darwin/amd64
2. What operating system and processor architecture are you using (go env)?
   GOARCH="amd64"
   GOBIN=""
   GOEXE=""
   GOHOSTARCH="amd64"
   GOHOSTOS="darwin"
   GOOS="darwin"
   GOPATH="/Users/wkc"
   GORACE=""
   GOROOT="/Users/wkc/local/go"
   GOTOOLDIR="/Users/wkc/local/go/pkg/tool/darwin_amd64"
   CC="clang"
   GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/xw/mx32d21j5hd_1gyxv14c77m00000gn/T/go-build713088348=/tmp/go-build -gno-record-gcc-switches -fno-common"
   CXX="clang++"
   CGO_ENABLED="1"
3. 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.

go install my-package
panic: runtime error: index out of range

goroutine 1 [running]:
panic(0x19fa40, 0xc420012190)
        /usr/local/go/src/runtime/panic.go:500 +0x1a1
cmd/link/internal/ld.(*deadcodepass).flood(0xc420069cd0)
        /usr/local/go/src/cmd/link/internal/ld/deadcode.go:279 +0xe88
cmd/link/internal/ld.deadcode(0xc4204a2000)
        /usr/local/go/src/cmd/link/internal/ld/deadcode.go:100 +0x498
cmd/link/internal/ld.Ldmain()
        /usr/local/go/src/cmd/link/internal/ld/pobj.go:192 +0x1089
cmd/link/internal/amd64.Main()
        /usr/local/go/src/cmd/link/internal/amd64/obj.go:45 +0x19
main.main()
        /usr/local/go/src/cmd/link/main.go:28 +0x27d

1. What did you expect to see?
2. What did you see instead?

[davecheney]

Is the source of the code you are compiling available so I can try to
reproduce this bug?

On Fri, Aug 26, 2016 at 3:15 PM, wangkechun notifications@github.com
wrote:

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?
go version go1.7 darwin/amd64
2.

What operating system and processor architecture are you using (go env
)?
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/wkc"
GORACE=""
GOROOT="/Users/wkc/local/go"
GOTOOLDIR="/Users/wkc/local/go/pkg/tool/darwin_amd64"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics
-Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/
folders/xw/mx32d21j5hd_1gyxv14c77m00000gn/T/go-build713088348=/tmp/go-build
-gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"
3.

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.

go install my package
panic: runtime error: index out of range

goroutine 1 [running]:
panic(0x19fa40, 0xc420012190)
/usr/local/go/src/runtime/panic.go:500 +0x1a1
cmd/link/internal/ld.(*deadcodepass).flood(0xc420069cd0)
/usr/local/go/src/cmd/link/internal/ld/deadcode.go:279 +0xe88
cmd/link/internal/ld.deadcode(0xc4204a2000)
/usr/local/go/src/cmd/link/internal/ld/deadcode.go:100 +0x498
cmd/link/internal/ld.Ldmain()
/usr/local/go/src/cmd/link/internal/ld/pobj.go:192 +0x1089
cmd/link/internal/amd64.Main()
/usr/local/go/src/cmd/link/internal/amd64/obj.go:45 +0x19
main.main()
/usr/local/go/src/cmd/link/main.go:28 +0x27d

What did you expect to see?
2.

What did you see instead?

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[josharian]

cc @crawshaw -- the panic is probably from decodetypeKind in this line:

            if decodetypeKind(s)&kindMask == kindInterface {

[mandeepbrar]

+1. Same error. Trying to build an otherwise working program with go:binary-only-package in official docker.

go version go1.7.1 linux/amd64

go env.

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/go"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build035439187=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"

[crawshaw]

@mandeepbrar want to try out https://golang.org/cl/29692? It's designed to fix #17140 but the diagnostics change may mean you get further into linking before an error.

[mandeepbrar]

@crawshaw Seems to go a little further, but an error again

`
panic: runtime error: index out of range

goroutine 1 [running]:
panic(0x59f780, 0x690520)
/home/mandeep/test/go/src/runtime/panic.go:496 +0x1a0
cmd/link/internal/ld.newtype(0xc420494000, 0xc4224ad118, 0xc42ebc3770)
/home/mandeep/test/go/src/cmd/link/internal/ld/dwarf.go:379 +0x3701
cmd/link/internal/ld.defgotype(0xc420494000, 0xc4224ad118, 0x592ac0)
/home/mandeep/test/go/src/cmd/link/internal/ld/dwarf.go:374 +0x1f1
cmd/link/internal/ld.newtype(0xc420494000, 0xc42249ad48, 0xc42eb64700)
/home/mandeep/test/go/src/cmd/link/internal/ld/dwarf.go:425 +0x2e77
cmd/link/internal/ld.defgotype(0xc420494000, 0xc42249ad48, 0x592ac0)
/home/mandeep/test/go/src/cmd/link/internal/ld/dwarf.go:374 +0x1f1
cmd/link/internal/ld.defdwsymb(0xc420494000, 0xc42249ae30, 0xc4224fac00, 0x2f, 0xc42b5ac944, 0x2a76e0, 0xc42249ad48)
/home/mandeep/test/go/src/cmd/link/internal/ld/dwarf.go:846 +0x1ba
cmd/link/internal/ld.genasmsym(0xc420494000, 0x5d87d0)
/home/mandeep/test/go/src/cmd/link/internal/ld/lib.go:1892 +0x643
cmd/link/internal/ld.dwarfgeneratedebugsyms(0xc420494000)
/home/mandeep/test/go/src/cmd/link/internal/ld/dwarf.go:1453 +0x8c1
cmd/link/internal/ld.(*Link).dodata(0xc420494000)
/home/mandeep/test/go/src/cmd/link/internal/ld/data.go:1752 +0x2f4b
cmd/link/internal/ld.Main()
/home/mandeep/test/go/src/cmd/link/internal/ld/main.go:204 +0x907
main.main()
/home/mandeep/test/go/src/cmd/link/main.go:55 +0x139

`

[bradfitz]

Does anybody have a repro here?

I'm going to kick to Go1.10 since we don't have one yet.

[gopherbot]

Timed out in state WaitingForInfo. Closing.

(I am just a bot, though. Please speak up if this is a mistake or you have the requested information.)