cmd/compile: intermittently crash:unexpected fault address 0xc000c060a0

[andycook-bcs]

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

From the golang:1.12.6 Docker container.

$ go version go1.12.6 linux/amd64

Does this issue reproduce with the latest release?

Unknown if in 1.13.x

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

go env Output

GOARCH="amd64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/go"
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
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-build824262995=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Compiling a a moderately large project like normal. However we upgraded from GO 1.10.2 -> 1.12.6 it occasionally panic during compilation (1 out ~50) times?

• No specific code to demonstrate problem.

What did you expect to see?

A successful compile with no panic.

What did you see instead?

This panic.

# strconv
unexpected fault address 0xc000c060a0
fatal error: fault
[signal SIGBUS: bus error code=0x2 addr=0xc000c060a0 pc=0xc7a2e0]

goroutine 33 [running]:
runtime.throw(0xe4eb44, 0x5)
	/usr/local/go/src/runtime/panic.go:617 +0x72 fp=0xc0009d98f8 sp=0xc0009d98c8 pc=0x42cbe2
runtime.sigpanic()
	/usr/local/go/src/runtime/signal_unix.go:387 +0x47e fp=0xc0009d9928 sp=0xc0009d98f8 pc=0x441aae
cmd/compile/internal/gc.newliveness(0xc0002c9b80, 0xc000900000, 0xc00064d100, 0x4, 0x4, 0xc00089f350, 0x0, 0x0)
	/usr/local/go/src/cmd/compile/internal/gc/plive.go:507 +0x2e0 fp=0xc0009d9a20 sp=0xc0009d9928 pc=0xc7a2e0
cmd/compile/internal/gc.liveness(0xc00070a030, 0xc000900000, 0xc000a8a310, 0x0, 0x0, 0x0)
	/usr/local/go/src/cmd/compile/internal/gc/plive.go:1394 +0x95 fp=0xc0009d9ab8 sp=0xc0009d9a20 pc=0xc81115
cmd/compile/internal/gc.genssa(0xc000900000, 0xc000a8a310)
	/usr/local/go/src/cmd/compile/internal/gc/ssa.go:5097 +0x93 fp=0xc0009d9ee8 sp=0xc0009d9ab8 pc=0xcd19e3
cmd/compile/internal/gc.compileSSA(0xc0002c9b80, 0x1)
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:309 +0x350 fp=0xc0009d9f98 sp=0xc0009d9ee8 pc=0xc71b20
cmd/compile/internal/gc.compileFunctions.func2(0xc0003ba0c0, 0xc0003edab0, 0x1)
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:364 +0x49 fp=0xc0009d9fc8 sp=0xc0009d9f98 pc=0xd35859
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc0009d9fd0 sp=0xc0009d9fc8 pc=0x45ae81
created by cmd/compile/internal/gc.compileFunctions
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:362 +0x129

goroutine 1 [chan send]:
cmd/compile/internal/gc.compileFunctions()
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:370 +0x17d
cmd/compile/internal/gc.Main(0xe767c8)
	/usr/local/go/src/cmd/compile/internal/gc/main.go:675 +0x3172
main.main()
	/usr/local/go/src/cmd/compile/main.go:51 +0xad

goroutine 16 [runnable]:
cmd/internal/obj.pctopcdata(0xc0000c8500, 0xc0008755e0, 0xc000000000, 0xc0000e6fd0, 0x0, 0xdc2660, 0xc0003a1b30, 0x0)
	/usr/local/go/src/cmd/internal/obj/pcln.go:287 +0x182
cmd/internal/obj.funcpctab(0xc0000c8500, 0xc000086ad0, 0xc0008755e0, 0xe5558c, 0xa, 0xe77028, 0xdc2660, 0xc0003a1b30)
	/usr/local/go/src/cmd/internal/obj/pcln.go:59 +0x13a
cmd/internal/obj.linkpcln(0xc0000c8500, 0xc0008755e0)
	/usr/local/go/src/cmd/internal/obj/pcln.go:370 +0x82e
cmd/internal/obj.Flushplist(0xc0000c8500, 0xc0009b7ec0, 0xc0008ec8e0, 0x7fff38385aa4, 0x7)
	/usr/local/go/src/cmd/internal/obj/plist.go:108 +0x749
cmd/compile/internal/gc.(*Progs).Flush(0xc00094bf80)
	/usr/local/go/src/cmd/compile/internal/gc/gsubr.go:93 +0xbc
cmd/compile/internal/gc.compileSSA(0xc0002c98c0, 0x0)
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:324 +0x5d4
cmd/compile/internal/gc.compileFunctions.func2(0xc0003ba0c0, 0xc0003edab0, 0x0)
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:364 +0x49
created by cmd/compile/internal/gc.compileFunctions
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:362 +0x129

goroutine 34 [runnable]:
cmd/compile/internal/gc.(*ssafn).AllocFrame(0xc000397f50, 0xc000451ce0)
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:153 +0x26c
cmd/compile/internal/ssa.stackframe(0xc000451ce0)
	/usr/local/go/src/cmd/compile/internal/ssa/stackframe.go:9 +0x39
cmd/compile/internal/ssa.Compile(0xc000451ce0)
	/usr/local/go/src/cmd/compile/internal/ssa/compile.go:90 +0x479
cmd/compile/internal/gc.buildssa(0xc0004091e0, 0x2, 0x0)
	/usr/local/go/src/cmd/compile/internal/gc/ssa.go:233 +0xbfd
cmd/compile/internal/gc.compileSSA(0xc0004091e0, 0x2)
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:299 +0x4d
cmd/compile/internal/gc.compileFunctions.func2(0xc0003ba0c0, 0xc0003edab0, 0x2)
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:364 +0x49
created by cmd/compile/internal/gc.compileFunctions
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:362 +0x129

goroutine 35 [runnable]:
cmd/compile/internal/ssa.(*sparseSet).addAll(0xc000547ad0, 0xc00095d000, 0x4, 0x40)
	/usr/local/go/src/cmd/compile/internal/ssa/sparseset.go:43 +0x153
cmd/compile/internal/ssa.(*stackAllocState).computeLive(0xc0000d42c0, 0xc000bf6d80, 0x2c, 0x2c)
	/usr/local/go/src/cmd/compile/internal/ssa/stackalloc.go:317 +0x9ec
cmd/compile/internal/ssa.(*stackAllocState).init(0xc0000d42c0, 0xc00054e2c0, 0xc000bf6d80, 0x2c, 0x2c)
	/usr/local/go/src/cmd/compile/internal/ssa/stackalloc.go:125 +0x41b
cmd/compile/internal/ssa.stackalloc(0xc00054e2c0, 0xc000bf6d80, 0x2c, 0x2c, 0x0, 0x0, 0x0)
	/usr/local/go/src/cmd/compile/internal/ssa/stackalloc.go:87 +0xb0
cmd/compile/internal/ssa.(*regAllocState).regalloc(0xc000355b00, 0xc00054e2c0)
	/usr/local/go/src/cmd/compile/internal/ssa/regalloc.go:1644 +0x6d27
cmd/compile/internal/ssa.regalloc(0xc00054e2c0)
	/usr/local/go/src/cmd/compile/internal/ssa/regalloc.go:146 +0x62
cmd/compile/internal/ssa.Compile(0xc00054e2c0)
	/usr/local/go/src/cmd/compile/internal/ssa/compile.go:90 +0x479
cmd/compile/internal/gc.buildssa(0xc0004089a0, 0x3, 0x0)
	/usr/local/go/src/cmd/compile/internal/gc/ssa.go:233 +0xbfd
cmd/compile/internal/gc.compileSSA(0xc0004089a0, 0x3)
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:299 +0x4d
cmd/compile/internal/gc.compileFunctions.func2(0xc0003ba0c0, 0xc0003edab0, 0x3)
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:364 +0x49
created by cmd/compile/internal/gc.compileFunctions
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:362 +0x129

[agnivade]

Just to confirm - you are seeing this with 1.12.6 right ? Your Go version shows 1.10.2.

Could you also try with tip and see if you are experiencing the same issue -

$ go get golang.org/dl/gotip
$ gotip download

@randall77

[andycook-bcs]

Just to confirm - you are seeing this with 1.12.6 right ? Your Go version shows 1.10.2.

Yes, sorry. Copy/Pasted from wrong window. This is definitely new from the 1.12.6 docker container.

I will try from tip soon. Might take a while to collect data since this is an intermittent bug.

[odeke-em]

Hello there @andycook-bcs, thank you for filing this issue and welcome to the Go project!
It has been a couple of months and Go1.14 is in the works. Might you be able to try again with Go1.13 but also to perhaps provide a minimal reproduction? Thank you.

[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.)