runtime: signal 28 received on thread with no signal stack

[jimrobinson]

Please answer these questions before submitting your issue. Thanks!

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

go version go1.8.3 darwin/amd64

Note this seems to be the same as Closed bug #16468 from v1.6.

Does this issue reproduce with the latest release?

could not reproduce even w/o changing anything else

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

MacOS 10.12.6 (16G29)

$ go env
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/jimr/Library/gocode:/Users/jimr/proj/github:/Users/jimr/proj/code/gocode/trunk"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/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/jz/618480gn79q0flkfzpspqs8h0000gn/T/go-build442434706=/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?

ran "go build" and immediately started to resize the terminal window, at which point the stack was dumped by go build. I can't tell if the resize and dump were cause and effect, but I haven't been able to reproduce the problem.

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

What did you expect to see?

go build should have completed w/o panic

What did you see instead?

$ go build
signal 28 received on thread with no signal stack
fatal error: non-Go code disabled sigaltstack

runtime stack:
runtime.throw(0x149aa79, 0x20)
	/usr/local/go/src/runtime/panic.go:596 +0x95
runtime.noSignalStack(0x1c)
	/usr/local/go/src/runtime/signal_unix.go:455 +0x94
runtime.sigtrampgo(0x657669740000001c, 0xc420506d10, 0xc420506d78)
	/usr/local/go/src/runtime/signal_unix.go:238 +0x2d8
runtime.sigtramp(0x2065726120657365, 0x63696e756d6d6f63, 0x2079622064657461, 0x200000200000085, 0xc4202300f0, 0x10a4c, 0xc420128000, 0xc420506e30, 0x1, 0x0, ...)
	/usr/local/go/src/runtime/sys_darwin_amd64.s:240 +0x28

goroutine 17 [syscall, locked to thread]:
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:2197 +0x1 fp=0xc42003efe8 sp=0xc42003efe0

goroutine 1 [semacquire]:
sync.runtime_Semacquire(0xc42025437c)
	/usr/local/go/src/runtime/sema.go:47 +0x34
sync.(*WaitGroup).Wait(0xc420254370)
	/usr/local/go/src/sync/waitgroup.go:131 +0x7a
main.(*builder).do(0xc420136380, 0xc4202dad00)
	/usr/local/go/src/cmd/go/build.go:1370 +0x4be
main.runBuild(0x168d5e0, 0xc42000c270, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:526 +0x32b
main.main()
	/usr/local/go/src/cmd/go/main.go:184 +0x69d

goroutine 5 [syscall]:
os/signal.signal_recv(0x0)
	/usr/local/go/src/runtime/sigqueue.go:116 +0xff
os/signal.loop()
	/usr/local/go/src/os/signal/signal_unix.go:22 +0x22
created by os/signal.init.1
	/usr/local/go/src/os/signal/signal_unix.go:28 +0x41

goroutine 82 [syscall]:
syscall.Syscall(0x3, 0x8, 0xc42020e200, 0x200, 0xc42020e200, 0x200, 0x1474640)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0x8, 0xc42020e200, 0x200, 0x200, 0xc420262000, 0x1766960, 0x0)
	/usr/local/go/src/syscall/zsyscall_darwin_amd64.go:973 +0x55
syscall.Read(0x8, 0xc42020e200, 0x200, 0x200, 0x102990f, 0x14b3ed8, 0xc42002e5c0)
	/usr/local/go/src/syscall/syscall_unix.go:162 +0x49
os.(*File).read(0xc420124048, 0xc42020e200, 0x200, 0x200, 0x10676ab, 0x13fd9a0, 0x200)
	/usr/local/go/src/os/file_unix.go:165 +0x6a
os.(*File).Read(0xc420124048, 0xc42020e200, 0x200, 0x200, 0x148fa66, 0x9, 0xc42002e660)
	/usr/local/go/src/os/file.go:101 +0x76
bytes.(*Buffer).ReadFrom(0xc4200b65b0, 0x165cc00, 0xc420124048, 0x1a40028, 0xc4200b65b0, 0x1050001)
	/usr/local/go/src/bytes/buffer.go:179 +0x160
io.copyBuffer(0x165bbc0, 0xc4200b65b0, 0x165cc00, 0xc420124048, 0x0, 0x0, 0x0, 0xc4200984e0, 0xc42002e7a0, 0x100644c)
	/usr/local/go/src/io/io.go:384 +0x2cb
io.Copy(0x165bbc0, 0xc4200b65b0, 0x165cc00, 0xc420124048, 0x80, 0xc42002e7a0, 0x0)
	/usr/local/go/src/io/io.go:360 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0x0, 0xc42002e7c8)
	/usr/local/go/src/os/exec/exec.go:254 +0x4d
os/exec.(*Cmd).Start.func1(0xc4201e62c0, 0xc4200fccc0)
	/usr/local/go/src/os/exec/exec.go:371 +0x27
created by os/exec.(*Cmd).Start
	/usr/local/go/src/os/exec/exec.go:372 +0x4e4

goroutine 34 [syscall]:
syscall.Syscall6(0xad, 0x1, 0x10a45, 0xc420503118, 0x24, 0x0, 0x0, 0x17664b0, 0x0, 0xc4200fcc80)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
os.(*Process).blockUntilWaitable(0xc4204565a0, 0xc4201e62c0, 0xc4200fccc0, 0x16)
	/usr/local/go/src/os/wait_waitid.go:28 +0xa5
os.(*Process).wait(0xc4204565a0, 0xc4203c2800, 0xc420124060, 0xc4201e6160)
	/usr/local/go/src/os/exec_unix.go:22 +0x4d
os.(*Process).Wait(0xc4204565a0, 0x0, 0x0, 0x14b4810)
	/usr/local/go/src/os/exec.go:115 +0x2b
os/exec.(*Cmd).Wait(0xc4201e62c0, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:435 +0x62
os/exec.(*Cmd).Run(0xc4201e62c0, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:280 +0x5c
main.(*builder).runOut(0xc420136380, 0xc42024c0c0, 0x56, 0xc4201cd6c0, 0x3a, 0x0, 0x0, 0x0, 0xc4201e6000, 0x13, ...)
	/usr/local/go/src/cmd/go/build.go:2141 +0x42b
main.gcToolchain.gc(0xc420136380, 0xc4203ccd80, 0xc420115900, 0x7f, 0xc420446360, 0x83, 0xc4201fd401, 0xc4200fca60, 0x2, 0x2, ...)
	/usr/local/go/src/cmd/go/build.go:2401 +0xfc1
main.(*gcToolchain).gc(0x16b1380, 0xc420136380, 0xc4203ccd80, 0xc420115900, 0x7f, 0xc420446360, 0x83, 0x1, 0xc4200fca60, 0x2, ...)
	<autogenerated>:5 +0x105
main.(*builder).build(0xc420136380, 0xc42031e9c0, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:1537 +0xadc
main.(*builder).do.func1(0xc42031e9c0)
	/usr/local/go/src/cmd/go/build.go:1302 +0x7d
main.(*builder).do.func2(0xc420254370, 0xc420136380, 0xc42013df20)
	/usr/local/go/src/cmd/go/build.go:1361 +0x145
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 35 [syscall]:
syscall.Syscall6(0xad, 0x1, 0x10a49, 0xc420523118, 0x24, 0x0, 0x0, 0x17664b0, 0x0, 0xc4202061c0)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
os.(*Process).blockUntilWaitable(0xc4204565d0, 0xc420430160, 0xc420206200, 0x12)
	/usr/local/go/src/os/wait_waitid.go:28 +0xa5
os.(*Process).wait(0xc4204565d0, 0xc4204dac00, 0xc420454030, 0xc4201fa000)
	/usr/local/go/src/os/exec_unix.go:22 +0x4d
os.(*Process).Wait(0xc4204565d0, 0x0, 0x0, 0x14b4810)
	/usr/local/go/src/os/exec.go:115 +0x2b
os/exec.(*Cmd).Wait(0xc420430160, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:435 +0x62
os/exec.(*Cmd).Run(0xc420430160, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:280 +0x5c
main.(*builder).runOut(0xc420136380, 0xc4202f7e00, 0x56, 0xc42013fa00, 0x3a, 0x0, 0x0, 0x0, 0xc420430000, 0xe, ...)
	/usr/local/go/src/cmd/go/build.go:2141 +0x42b
main.gcToolchain.gc(0xc420136380, 0xc4204b4d80, 0xc420115a00, 0x7f, 0xc420446630, 0x83, 0xc4201fd400, 0xc420206040, 0x2, 0x2, ...)
	/usr/local/go/src/cmd/go/build.go:2401 +0xfc1
main.(*gcToolchain).gc(0x16b1380, 0xc420136380, 0xc4204b4d80, 0xc420115a00, 0x7f, 0xc420446630, 0x83, 0x0, 0xc420206040, 0x2, ...)
	<autogenerated>:5 +0x105
main.(*builder).build(0xc420136380, 0xc42031ed00, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:1537 +0xadc
main.(*builder).do.func1(0xc42031ed00)
	/usr/local/go/src/cmd/go/build.go:1302 +0x7d
main.(*builder).do.func2(0xc420254370, 0xc420136380, 0xc42013df20)
	/usr/local/go/src/cmd/go/build.go:1361 +0x145
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 36 [syscall]:
syscall.Syscall6(0xad, 0x1, 0x10a47, 0xc420513118, 0x24, 0x0, 0x0, 0x1766000, 0x0, 0xc42035e5e0)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
os.(*Process).blockUntilWaitable(0xc4204b87b0, 0xc420110160, 0xc42035e620, 0x10)
	/usr/local/go/src/os/wait_waitid.go:28 +0xa5
os.(*Process).wait(0xc4204b87b0, 0xc420484400, 0xc42024a030, 0xc42000aa00)
	/usr/local/go/src/os/exec_unix.go:22 +0x4d
os.(*Process).Wait(0xc4204b87b0, 0x0, 0x0, 0x14b4810)
	/usr/local/go/src/os/exec.go:115 +0x2b
os/exec.(*Cmd).Wait(0xc420110160, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:435 +0x62
os/exec.(*Cmd).Run(0xc420110160, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:280 +0x5c
main.(*builder).runOut(0xc420136380, 0xc42010e620, 0x65, 0xc420123630, 0x49, 0x0, 0x0, 0x0, 0xc420110000, 0xd, ...)
	/usr/local/go/src/cmd/go/build.go:2141 +0x42b
main.gcToolchain.gc(0xc420136380, 0xc4203cc900, 0xc420446240, 0x8e, 0xc420382640, 0x92, 0xc4201fd400, 0xc42035e480, 0x2, 0x2, ...)
	/usr/local/go/src/cmd/go/build.go:2401 +0xfc1
main.(*gcToolchain).gc(0x16b1380, 0xc420136380, 0xc4203cc900, 0xc420446240, 0x8e, 0xc420382640, 0x92, 0x0, 0xc42035e480, 0x2, ...)
	<autogenerated>:5 +0x105
main.(*builder).build(0xc420136380, 0xc42031e8f0, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:1537 +0xadc
main.(*builder).do.func1(0xc42031e8f0)
	/usr/local/go/src/cmd/go/build.go:1302 +0x7d
main.(*builder).do.func2(0xc420254370, 0xc420136380, 0xc42013df20)
	/usr/local/go/src/cmd/go/build.go:1361 +0x145
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 37 [running]:
	goroutine running on other thread; stack unavailable
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 38 [syscall]:
syscall.Syscall6(0xad, 0x1, 0x10a48, 0xc420527118, 0x24, 0x0, 0x0, 0x1767770, 0x0, 0xc4201e41a0)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
os.(*Process).blockUntilWaitable(0xc4203ca8d0, 0xc4202c4160, 0xc4201e4220, 0x12)
	/usr/local/go/src/os/wait_waitid.go:28 +0xa5
os.(*Process).wait(0xc4203ca8d0, 0xc420177000, 0xc4204d4030, 0xc420096240)
	/usr/local/go/src/os/exec_unix.go:22 +0x4d
os.(*Process).Wait(0xc4203ca8d0, 0x0, 0x0, 0x14b4810)
	/usr/local/go/src/os/exec.go:115 +0x2b
os/exec.(*Cmd).Wait(0xc4202c4160, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:435 +0x62
os/exec.(*Cmd).Run(0xc4202c4160, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:280 +0x5c
main.(*builder).runOut(0xc420136380, 0xc4203eddb0, 0x4d, 0xc420120800, 0x31, 0x0, 0x0, 0x0, 0xc4202c4000, 0xe, ...)
	/usr/local/go/src/cmd/go/build.go:2141 +0x42b
main.gcToolchain.gc(0xc420136380, 0xc4204b5680, 0xc420115b80, 0x76, 0xc420115b00, 0x7a, 0xc4201fd400, 0xc4201e4040, 0x2, 0x2, ...)
	/usr/local/go/src/cmd/go/build.go:2401 +0xfc1
main.(*gcToolchain).gc(0x16b1380, 0xc420136380, 0xc4204b5680, 0xc420115b80, 0x76, 0xc420115b00, 0x7a, 0x0, 0xc4201e4040, 0x2, ...)
	<autogenerated>:5 +0x105
main.(*builder).build(0xc420136380, 0xc42031edd0, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:1537 +0xadc
main.(*builder).do.func1(0xc42031edd0)
	/usr/local/go/src/cmd/go/build.go:1302 +0x7d
main.(*builder).do.func2(0xc420254370, 0xc420136380, 0xc42013df20)
	/usr/local/go/src/cmd/go/build.go:1361 +0x145
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 39 [syscall]:
syscall.Syscall6(0xad, 0x1, 0x10a4b, 0xc42052b118, 0x24, 0x0, 0x0, 0x17680d0, 0x0, 0xc4202ba1e0)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
os.(*Process).blockUntilWaitable(0xc42035c3f0, 0xc4203022c0, 0xc4202ba260, 0x1a)
	/usr/local/go/src/os/wait_waitid.go:28 +0xa5
os.(*Process).wait(0xc42035c3f0, 0xc4204dc800, 0xc4202b6030, 0xc4200981a0)
	/usr/local/go/src/os/exec_unix.go:22 +0x4d
os.(*Process).Wait(0xc42035c3f0, 0x0, 0x0, 0x14b4810)
	/usr/local/go/src/os/exec.go:115 +0x2b
os/exec.(*Cmd).Wait(0xc4203022c0, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:435 +0x62
os/exec.(*Cmd).Run(0xc4203022c0, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:280 +0x5c
main.(*builder).runOut(0xc420136380, 0xc420113b00, 0x54, 0xc420247900, 0x38, 0x0, 0x0, 0x0, 0xc4202382c0, 0x17, ...)
	/usr/local/go/src/cmd/go/build.go:2141 +0x42b
main.gcToolchain.gc(0xc420136380, 0xc42027f680, 0xc4201a6000, 0x7d, 0xc420446750, 0x81, 0xc4201fd400, 0xc4202ba020, 0x2, 0x2, ...)
	/usr/local/go/src/cmd/go/build.go:2401 +0xfc1
main.(*gcToolchain).gc(0x16b1380, 0xc420136380, 0xc42027f680, 0xc4201a6000, 0x7d, 0xc420446750, 0x81, 0x0, 0xc4202ba020, 0x2, ...)
	<autogenerated>:5 +0x105
main.(*builder).build(0xc420136380, 0xc42031f040, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:1537 +0xadc
main.(*builder).do.func1(0xc42031f040)
	/usr/local/go/src/cmd/go/build.go:1302 +0x7d
main.(*builder).do.func2(0xc420254370, 0xc420136380, 0xc42013df20)
	/usr/local/go/src/cmd/go/build.go:1361 +0x145
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 40 [running]:
	goroutine running on other thread; stack unavailable
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 41 [syscall]:
syscall.Syscall6(0xad, 0x1, 0x10a46, 0xc420517118, 0x24, 0x0, 0x0, 0x1766e10, 0x0, 0xc42000c520)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
os.(*Process).blockUntilWaitable(0xc420270c60, 0xc420414160, 0xc42000c580, 0x14)
	/usr/local/go/src/os/wait_waitid.go:28 +0xa5
os.(*Process).wait(0xc420270c60, 0xc420469400, 0xc42000e050, 0xc4200ae000)
	/usr/local/go/src/os/exec_unix.go:22 +0x4d
os.(*Process).Wait(0xc420270c60, 0x0, 0x0, 0x14b4810)
	/usr/local/go/src/os/exec.go:115 +0x2b
os/exec.(*Cmd).Wait(0xc420414160, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:435 +0x62
os/exec.(*Cmd).Run(0xc420414160, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:280 +0x5c
main.(*builder).runOut(0xc420136380, 0xc420391b60, 0x5d, 0xc420353680, 0x41, 0x0, 0x0, 0x0, 0xc420414000, 0x10, ...)
	/usr/local/go/src/cmd/go/build.go:2141 +0x42b
main.gcToolchain.gc(0xc420136380, 0xc4203cdb00, 0xc420446510, 0x86, 0xc420446480, 0x8a, 0xc4201fd400, 0xc42000c1e0, 0x2, 0x2, ...)
	/usr/local/go/src/cmd/go/build.go:2401 +0xfc1
main.(*gcToolchain).gc(0x16b1380, 0xc420136380, 0xc4203cdb00, 0xc420446510, 0x86, 0xc420446480, 0x8a, 0x0, 0xc42000c1e0, 0x2, ...)
	<autogenerated>:5 +0x105
main.(*builder).build(0xc420136380, 0xc42031eb60, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:1537 +0xadc
main.(*builder).do.func1(0xc42031eb60)
	/usr/local/go/src/cmd/go/build.go:1302 +0x7d
main.(*builder).do.func2(0xc420254370, 0xc420136380, 0xc42013df20)
	/usr/local/go/src/cmd/go/build.go:1361 +0x145
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 51 [syscall]:
syscall.Syscall(0x3, 0x20, 0xc420406200, 0x200, 0x0, 0x0, 0x0)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0x20, 0xc420406200, 0x200, 0x200, 0xc4204dcc00, 0x17680d0, 0x0)
	/usr/local/go/src/syscall/zsyscall_darwin_amd64.go:973 +0x55
syscall.Read(0x20, 0xc420406200, 0x200, 0x200, 0x102990f, 0x14b3ed8, 0xc4204f3dc0)
	/usr/local/go/src/syscall/syscall_unix.go:162 +0x49
os.(*File).read(0xc4202b6018, 0xc420406200, 0x200, 0x200, 0x10676ab, 0x13fd9a0, 0x200)
	/usr/local/go/src/os/file_unix.go:165 +0x6a
os.(*File).Read(0xc4202b6018, 0xc420406200, 0x200, 0x200, 0x0, 0x0, 0xc4204f3e60)
	/usr/local/go/src/os/file.go:101 +0x76
bytes.(*Buffer).ReadFrom(0xc42020c380, 0x165cc00, 0xc4202b6018, 0x1a40028, 0xc42020c380, 0x1)
	/usr/local/go/src/bytes/buffer.go:179 +0x160
io.copyBuffer(0x165bbc0, 0xc42020c380, 0x165cc00, 0xc4202b6018, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
	/usr/local/go/src/io/io.go:384 +0x2cb
io.Copy(0x165bbc0, 0xc42020c380, 0x165cc00, 0xc4202b6018, 0x0, 0x0, 0x0)
	/usr/local/go/src/io/io.go:360 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:254 +0x4d
os/exec.(*Cmd).Start.func1(0xc4203022c0, 0xc4202ba260)
	/usr/local/go/src/os/exec/exec.go:371 +0x27
created by os/exec.(*Cmd).Start
	/usr/local/go/src/os/exec/exec.go:372 +0x4e4

goroutine 66 [syscall]:
syscall.Syscall(0x3, 0x14, 0xc42027c200, 0x200, 0xc42027c200, 0x200, 0xc42019e56a)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0x14, 0xc42027c200, 0x200, 0x200, 0xc420129000, 0x1766e10, 0x0)
	/usr/local/go/src/syscall/zsyscall_darwin_amd64.go:973 +0x55
syscall.Read(0x14, 0xc42027c200, 0x200, 0x200, 0x102990f, 0x14b3ed8, 0xc4204f95c0)
	/usr/local/go/src/syscall/syscall_unix.go:162 +0x49
os.(*File).read(0xc4204d4018, 0xc42027c200, 0x200, 0x200, 0x10676ab, 0x13fd9a0, 0x200)
	/usr/local/go/src/os/file_unix.go:165 +0x6a
os.(*File).Read(0xc4204d4018, 0xc42027c200, 0x200, 0x200, 0xc420440e00, 0xc4204f9670, 0xc4204f9660)
	/usr/local/go/src/os/file.go:101 +0x76
bytes.(*Buffer).ReadFrom(0xc42016e380, 0x165cc00, 0xc4204d4018, 0x1a40028, 0xc42016e380, 0x1)
	/usr/local/go/src/bytes/buffer.go:179 +0x160
io.copyBuffer(0x165bbc0, 0xc42016e380, 0x165cc00, 0xc4204d4018, 0x0, 0x0, 0x0, 0x1, 0x100000000000000, 0xc42031edd0)
	/usr/local/go/src/io/io.go:384 +0x2cb
io.Copy(0x165bbc0, 0xc42016e380, 0x165cc00, 0xc4204d4018, 0xc42019e4b0, 0x13b2842, 0x200001)
	/usr/local/go/src/io/io.go:360 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0x180001, 0x0)
	/usr/local/go/src/os/exec/exec.go:254 +0x4d
os/exec.(*Cmd).Start.func1(0xc4202c4160, 0xc4201e4220)
	/usr/local/go/src/os/exec/exec.go:371 +0x27
created by os/exec.(*Cmd).Start
	/usr/local/go/src/os/exec/exec.go:372 +0x4e4

goroutine 9 [syscall]:
syscall.Syscall(0x3, 0x10, 0xc4203ba000, 0x200, 0x1766000, 0x19, 0xc4203ba000)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0x10, 0xc4203ba000, 0x200, 0x200, 0xc420484c00, 0x1766000, 0x0)
	/usr/local/go/src/syscall/zsyscall_darwin_amd64.go:973 +0x55
syscall.Read(0x10, 0xc4203ba000, 0x200, 0x200, 0x102990f, 0x14b3ed8, 0xc4204f7dc0)
	/usr/local/go/src/syscall/syscall_unix.go:162 +0x49
os.(*File).read(0xc42024a018, 0xc4203ba000, 0x200, 0x200, 0x10676ab, 0x13fd9a0, 0x200)
	/usr/local/go/src/os/file_unix.go:165 +0x6a
os.(*File).Read(0xc42024a018, 0xc4203ba000, 0x200, 0x200, 0x1051c50, 0xc420001d40, 0xc4204f7e60)
	/usr/local/go/src/os/file.go:101 +0x76
bytes.(*Buffer).ReadFrom(0xc420162230, 0x165cc00, 0xc42024a018, 0x1a40028, 0xc420162230, 0x169e601)
	/usr/local/go/src/bytes/buffer.go:179 +0x160
io.copyBuffer(0x165bbc0, 0xc420162230, 0x165cc00, 0xc42024a018, 0x0, 0x0, 0x0, 0x1, 0x100000000000000, 0xc42031ed00)
	/usr/local/go/src/io/io.go:384 +0x2cb
io.Copy(0x165bbc0, 0xc420162230, 0x165cc00, 0xc42024a018, 0xc42019e4b0, 0x13b2842, 0x200001)
	/usr/local/go/src/io/io.go:360 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0x180001, 0x0)
	/usr/local/go/src/os/exec/exec.go:254 +0x4d
os/exec.(*Cmd).Start.func1(0xc420110160, 0xc42035e620)
	/usr/local/go/src/os/exec/exec.go:371 +0x27
created by os/exec.(*Cmd).Start
	/usr/local/go/src/os/exec/exec.go:372 +0x4e4

goroutine 98 [syscall]:
syscall.Syscall(0x3, 0xc, 0xc4201aa200, 0x200, 0x2, 0x2, 0xc42019e567)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0xc, 0xc4201aa200, 0x200, 0x200, 0xc4204db000, 0x17664b0, 0x0)
	/usr/local/go/src/syscall/zsyscall_darwin_amd64.go:973 +0x55
syscall.Read(0xc, 0xc4201aa200, 0x200, 0x200, 0x102990f, 0x14b3ed8, 0xc42002fdc0)
	/usr/local/go/src/syscall/syscall_unix.go:162 +0x49
os.(*File).read(0xc42000e038, 0xc4201aa200, 0x200, 0x200, 0x10676ab, 0x13fd9a0, 0x200)
	/usr/local/go/src/os/file_unix.go:165 +0x6a
os.(*File).Read(0xc42000e038, 0xc4201aa200, 0x200, 0x200, 0xc420440e00, 0xc42002fe70, 0xc42002fe60)
	/usr/local/go/src/os/file.go:101 +0x76
bytes.(*Buffer).ReadFrom(0xc42010e850, 0x165cc00, 0xc42000e038, 0x1a40028, 0xc42010e850, 0x1)
	/usr/local/go/src/bytes/buffer.go:179 +0x160
io.copyBuffer(0x165bbc0, 0xc42010e850, 0x165cc00, 0xc42000e038, 0x0, 0x0, 0x0, 0x1, 0x100000000000000, 0xc42031eb60)
	/usr/local/go/src/io/io.go:384 +0x2cb
io.Copy(0x165bbc0, 0xc42010e850, 0x165cc00, 0xc42000e038, 0xc42019e4b0, 0x13b2842, 0x200001)
	/usr/local/go/src/io/io.go:360 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0x180001, 0x0)
	/usr/local/go/src/os/exec/exec.go:254 +0x4d
os/exec.(*Cmd).Start.func1(0xc420414160, 0xc42000c580)
	/usr/local/go/src/os/exec/exec.go:371 +0x27
created by os/exec.(*Cmd).Start
	/usr/local/go/src/os/exec/exec.go:372 +0x4e4

goroutine 83 [syscall]:
syscall.Syscall(0x3, 0x18, 0xc42027c400, 0x200, 0xc42027c400, 0x200, 0xc42019e570)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0x18, 0xc42027c400, 0x200, 0x200, 0xc420262400, 0x1766e10, 0x0)
	/usr/local/go/src/syscall/zsyscall_darwin_amd64.go:973 +0x55
syscall.Read(0x18, 0xc42027c400, 0x200, 0x200, 0x102990f, 0x14b3ed8, 0xc4204f9dc0)
	/usr/local/go/src/syscall/syscall_unix.go:162 +0x49
os.(*File).read(0xc420454018, 0xc42027c400, 0x200, 0x200, 0x10676ab, 0x13fd9a0, 0x200)
	/usr/local/go/src/os/file_unix.go:165 +0x6a
os.(*File).Read(0xc420454018, 0xc42027c400, 0x200, 0x200, 0xc420440e00, 0xc4204f9e70, 0xc4204f9e60)
	/usr/local/go/src/os/file.go:101 +0x76
bytes.(*Buffer).ReadFrom(0xc420186460, 0x165cc00, 0xc420454018, 0x1a40028, 0xc420186460, 0x1)
	/usr/local/go/src/bytes/buffer.go:179 +0x160
io.copyBuffer(0x165bbc0, 0xc420186460, 0x165cc00, 0xc420454018, 0x0, 0x0, 0x0, 0x1, 0x100000000000000, 0xc42031f040)
	/usr/local/go/src/io/io.go:384 +0x2cb
io.Copy(0x165bbc0, 0xc420186460, 0x165cc00, 0xc420454018, 0xc42019e4b0, 0x13b2842, 0x200001)
	/usr/local/go/src/io/io.go:360 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0x180001, 0x0)
	/usr/local/go/src/os/exec/exec.go:254 +0x4d
os/exec.(*Cmd).Start.func1(0xc420430160, 0xc420206200)
	/usr/local/go/src/os/exec/exec.go:371 +0x27
created by os/exec.(*Cmd).Start
	/usr/local/go/src/os/exec/exec.go:372 +0x4e4
go build github.com/highwire/binsvc/vendor/github.com/jimrobinson/trace: /usr/local/go/pkg/tool/darwin_amd64/compile: exit status 2
signal 28 received on thread with no signal stack
fatal error: non-Go code disabled sigaltstack

runtime stack:
runtime.throw(0x149aa79, 0x20)
	/usr/local/go/src/runtime/panic.go:596 +0x95
runtime.noSignalStack(0x1c)
	/usr/local/go/src/runtime/signal_unix.go:455 +0x94
runtime.sigtrampgo(0x657669740000001c, 0xc420506d10, 0xc420506d78)
	/usr/local/go/src/runtime/signal_unix.go:238 +0x2d8
runtime.sigtramp(0x2065726120657365, 0x63696e756d6d6f63, 0x2079622064657461, 0x200000200000085, 0xc4202301e0, 0x10a50, 0xc420128000, 0xc420506e30, 0x1, 0x0, ...)
	/usr/local/go/src/runtime/sys_darwin_amd64.s:240 +0x28

goroutine 17 [syscall, locked to thread]:
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:2197 +0x1 fp=0xc42003efe8 sp=0xc42003efe0

goroutine 1 [semacquire]:
sync.runtime_Semacquire(0xc42025437c)
	/usr/local/go/src/runtime/sema.go:47 +0x34
sync.(*WaitGroup).Wait(0xc420254370)
	/usr/local/go/src/sync/waitgroup.go:131 +0x7a
main.(*builder).do(0xc420136380, 0xc4202dad00)
	/usr/local/go/src/cmd/go/build.go:1370 +0x4be
main.runBuild(0x168d5e0, 0xc42000c270, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:526 +0x32b
main.main()
	/usr/local/go/src/cmd/go/main.go:184 +0x69d

goroutine 5 [syscall]:
os/signal.signal_recv(0x0)
	/usr/local/go/src/runtime/sigqueue.go:116 +0xff
os/signal.loop()
	/usr/local/go/src/os/signal/signal_unix.go:22 +0x22
created by os/signal.init.1
	/usr/local/go/src/os/signal/signal_unix.go:28 +0x41

goroutine 82 [syscall]:
syscall.Syscall(0x3, 0x8, 0xc42020e200, 0x200, 0xc42020e200, 0x200, 0x1474640)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0x8, 0xc42020e200, 0x200, 0x200, 0xc420262000, 0x1766960, 0x0)
	/usr/local/go/src/syscall/zsyscall_darwin_amd64.go:973 +0x55
syscall.Read(0x8, 0xc42020e200, 0x200, 0x200, 0x102990f, 0x14b3ed8, 0xc42002e5c0)
	/usr/local/go/src/syscall/syscall_unix.go:162 +0x49
os.(*File).read(0xc420124048, 0xc42020e200, 0x200, 0x200, 0x10676ab, 0x13fd9a0, 0x200)
	/usr/local/go/src/os/file_unix.go:165 +0x6a
os.(*File).Read(0xc420124048, 0xc42020e200, 0x200, 0x200, 0x148fa66, 0x9, 0xc42002e660)
	/usr/local/go/src/os/file.go:101 +0x76
bytes.(*Buffer).ReadFrom(0xc4200b65b0, 0x165cc00, 0xc420124048, 0x1a40028, 0xc4200b65b0, 0x1050001)
	/usr/local/go/src/bytes/buffer.go:179 +0x160
io.copyBuffer(0x165bbc0, 0xc4200b65b0, 0x165cc00, 0xc420124048, 0x0, 0x0, 0x0, 0xc4200984e0, 0xc42002e7a0, 0x100644c)
	/usr/local/go/src/io/io.go:384 +0x2cb
io.Copy(0x165bbc0, 0xc4200b65b0, 0x165cc00, 0xc420124048, 0x80, 0xc42002e7a0, 0x0)
	/usr/local/go/src/io/io.go:360 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0x0, 0xc42002e7c8)
	/usr/local/go/src/os/exec/exec.go:254 +0x4d
os/exec.(*Cmd).Start.func1(0xc4201e62c0, 0xc4200fccc0)
	/usr/local/go/src/os/exec/exec.go:371 +0x27
created by os/exec.(*Cmd).Start
	/usr/local/go/src/os/exec/exec.go:372 +0x4e4

goroutine 84 [syscall]:
syscall.Syscall(0x3, 0xd, 0xc420441200, 0x200, 0xc420441200, 0x200, 0x0)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0xd, 0xc420441200, 0x200, 0x200, 0xc4203c3c00, 0x17672c0, 0x0)
	/usr/local/go/src/syscall/zsyscall_darwin_amd64.go:973 +0x55
syscall.Read(0xd, 0xc420441200, 0x200, 0x200, 0x102990f, 0x14b3ed8, 0xc42002edc0)
	/usr/local/go/src/syscall/syscall_unix.go:162 +0x49
os.(*File).read(0xc420454030, 0xc420441200, 0x200, 0x200, 0x10676ab, 0x13fd9a0, 0x200)
	/usr/local/go/src/os/file_unix.go:165 +0x6a
os.(*File).Read(0xc420454030, 0xc420441200, 0x200, 0x200, 0x10328be, 0xc4200996c0, 0xc42002ee60)
	/usr/local/go/src/os/file.go:101 +0x76
bytes.(*Buffer).ReadFrom(0xc4202ae770, 0x165cc00, 0xc420454030, 0x1a40028, 0xc4202ae770, 0xc42002ef01)
	/usr/local/go/src/bytes/buffer.go:179 +0x160
io.copyBuffer(0x165bbc0, 0xc4202ae770, 0x165cc00, 0xc420454030, 0x0, 0x0, 0x0, 0xc4204d6178, 0x0, 0x0)
	/usr/local/go/src/io/io.go:384 +0x2cb
io.Copy(0x165bbc0, 0xc4202ae770, 0x165cc00, 0xc420454030, 0x13f9ae0, 0xc4204d6120, 0xc42002efb0)
	/usr/local/go/src/io/io.go:360 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0x13f9ae0, 0xc4204d6120)
	/usr/local/go/src/os/exec/exec.go:254 +0x4d
os/exec.(*Cmd).Start.func1(0xc42037c420, 0xc420206500)
	/usr/local/go/src/os/exec/exec.go:371 +0x27
created by os/exec.(*Cmd).Start
	/usr/local/go/src/os/exec/exec.go:372 +0x4e4

goroutine 34 [syscall]:
syscall.Syscall6(0xad, 0x1, 0x10a45, 0xc420503118, 0x24, 0x0, 0x0, 0x17664b0, 0x0, 0xc4200fcc80)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
os.(*Process).blockUntilWaitable(0xc4204565a0, 0xc4201e62c0, 0xc4200fccc0, 0x16)
	/usr/local/go/src/os/wait_waitid.go:28 +0xa5
os.(*Process).wait(0xc4204565a0, 0xc4203c2800, 0xc420124060, 0xc4201e6160)
	/usr/local/go/src/os/exec_unix.go:22 +0x4d
os.(*Process).Wait(0xc4204565a0, 0x0, 0x0, 0x14b4810)
	/usr/local/go/src/os/exec.go:115 +0x2b
os/exec.(*Cmd).Wait(0xc4201e62c0, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:435 +0x62
os/exec.(*Cmd).Run(0xc4201e62c0, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:280 +0x5c
main.(*builder).runOut(0xc420136380, 0xc42024c0c0, 0x56, 0xc4201cd6c0, 0x3a, 0x0, 0x0, 0x0, 0xc4201e6000, 0x13, ...)
	/usr/local/go/src/cmd/go/build.go:2141 +0x42b
main.gcToolchain.gc(0xc420136380, 0xc4203ccd80, 0xc420115900, 0x7f, 0xc420446360, 0x83, 0xc4201fd401, 0xc4200fca60, 0x2, 0x2, ...)
	/usr/local/go/src/cmd/go/build.go:2401 +0xfc1
main.(*gcToolchain).gc(0x16b1380, 0xc420136380, 0xc4203ccd80, 0xc420115900, 0x7f, 0xc420446360, 0x83, 0x1, 0xc4200fca60, 0x2, ...)
	<autogenerated>:5 +0x105
main.(*builder).build(0xc420136380, 0xc42031e9c0, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:1537 +0xadc
main.(*builder).do.func1(0xc42031e9c0)
	/usr/local/go/src/cmd/go/build.go:1302 +0x7d
main.(*builder).do.func2(0xc420254370, 0xc420136380, 0xc42013df20)
	/usr/local/go/src/cmd/go/build.go:1361 +0x145
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 35 [syscall]:
syscall.Syscall6(0xad, 0x1, 0x10a4e, 0xc420523118, 0x24, 0x0, 0x0, 0x1767c20, 0x0, 0xc4202baa20)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
os.(*Process).blockUntilWaitable(0xc4204329c0, 0xc42037c6e0, 0xc4202baa60, 0x10)
	/usr/local/go/src/os/wait_waitid.go:28 +0xa5
os.(*Process).wait(0xc4204329c0, 0xc420250800, 0xc4202b6078, 0xc4202fce00)
	/usr/local/go/src/os/exec_unix.go:22 +0x4d
os.(*Process).Wait(0xc4204329c0, 0x0, 0x0, 0x14b4810)
	/usr/local/go/src/os/exec.go:115 +0x2b
os/exec.(*Cmd).Wait(0xc42037c6e0, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:435 +0x62
os/exec.(*Cmd).Run(0xc42037c6e0, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:280 +0x5c
main.(*builder).runOut(0xc420136380, 0xc42010fce0, 0x63, 0xc420123900, 0x47, 0x0, 0x0, 0x0, 0xc42037c580, 0xd, ...)
	/usr/local/go/src/cmd/go/build.go:2141 +0x42b
main.gcToolchain.gc(0xc420136380, 0xc420236d80, 0xc420446fc0, 0x8c, 0xc420446f30, 0x90, 0xc4201fd400, 0xc420244580, 0x2, 0x2, ...)
	/usr/local/go/src/cmd/go/build.go:2401 +0xfc1
main.(*gcToolchain).gc(0x16b1380, 0xc420136380, 0xc420236d80, 0xc420446fc0, 0x8c, 0xc420446f30, 0x90, 0x0, 0xc420244580, 0x2, ...)
	<autogenerated>:5 +0x105
main.(*builder).build(0xc420136380, 0xc42031f790, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:1537 +0xadc
main.(*builder).do.func1(0xc42031f790)
	/usr/local/go/src/cmd/go/build.go:1302 +0x7d
main.(*builder).do.func2(0xc420254370, 0xc420136380, 0xc42013df20)
	/usr/local/go/src/cmd/go/build.go:1361 +0x145
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 36 [syscall]:
syscall.Syscall6(0xad, 0x1, 0x10a4f, 0xc420513118, 0x24, 0x0, 0x0, 0x17664b0, 0x0, 0xc4202064c0)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
os.(*Process).blockUntilWaitable(0xc420456840, 0xc42037c420, 0xc420206500, 0x10)
	/usr/local/go/src/os/wait_waitid.go:28 +0xa5
os.(*Process).wait(0xc420456840, 0xc4204b1c00, 0xc420454048, 0xc4202fcc00)
	/usr/local/go/src/os/exec_unix.go:22 +0x4d
os.(*Process).Wait(0xc420456840, 0x0, 0x0, 0x14b4810)
	/usr/local/go/src/os/exec.go:115 +0x2b
os/exec.(*Cmd).Wait(0xc42037c420, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:435 +0x62
os/exec.(*Cmd).Run(0xc42037c420, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:280 +0x5c
main.(*builder).runOut(0xc420136380, 0xc4202f6900, 0x5f, 0xc42042fdb0, 0x43, 0x0, 0x0, 0x0, 0xc42037c2c0, 0xd, ...)
	/usr/local/go/src/cmd/go/build.go:2141 +0x42b
main.gcToolchain.gc(0xc420136380, 0xc42014f200, 0xc420446c60, 0x88, 0xc420446bd0, 0x8c, 0xc4201fd400, 0xc420244440, 0x2, 0x2, ...)
	/usr/local/go/src/cmd/go/build.go:2401 +0xfc1
main.(*gcToolchain).gc(0x16b1380, 0xc420136380, 0xc42014f200, 0xc420446c60, 0x88, 0xc420446bd0, 0x8c, 0x0, 0xc420244440, 0x2, ...)
	<autogenerated>:5 +0x105
main.(*builder).build(0xc420136380, 0xc42031f5f0, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:1537 +0xadc
main.(*builder).do.func1(0xc42031f5f0)
	/usr/local/go/src/cmd/go/build.go:1302 +0x7d
main.(*builder).do.func2(0xc420254370, 0xc420136380, 0xc42013df20)
	/usr/local/go/src/cmd/go/build.go:1361 +0x145
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 37 [syscall]:
syscall.Syscall6(0xad, 0x1, 0x10a4d, 0xc42052f118, 0x24, 0x0, 0x0, 0x17680d0, 0x0, 0xc4202ba740)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
os.(*Process).blockUntilWaitable(0xc42035ca50, 0xc420302580, 0xc4202ba780, 0x12)
	/usr/local/go/src/os/wait_waitid.go:28 +0xa5
os.(*Process).wait(0xc42035ca50, 0xc4204dd800, 0xc4202b6060, 0xc4203be000)
	/usr/local/go/src/os/exec_unix.go:22 +0x4d
os.(*Process).Wait(0xc42035ca50, 0x0, 0x0, 0x14b4810)
	/usr/local/go/src/os/exec.go:115 +0x2b
os/exec.(*Cmd).Wait(0xc420302580, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:435 +0x62
os/exec.(*Cmd).Run(0xc420302580, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:280 +0x5c
main.(*builder).runOut(0xc420136380, 0xc42020c620, 0x63, 0xc42042e3c0, 0x47, 0x0, 0x0, 0x0, 0xc420302420, 0xf, ...)
	/usr/local/go/src/cmd/go/build.go:2141 +0x42b
main.gcToolchain.gc(0xc420136380, 0xc4203cd680, 0xc420446ab0, 0x8c, 0xc420446a20, 0x90, 0xc4201fd400, 0xc4202ba600, 0x2, 0x2, ...)
	/usr/local/go/src/cmd/go/build.go:2401 +0xfc1
main.(*gcToolchain).gc(0x16b1380, 0xc420136380, 0xc4203cd680, 0xc420446ab0, 0x8c, 0xc420446a20, 0x90, 0x0, 0xc4202ba600, 0x2, ...)
	<autogenerated>:5 +0x105
main.(*builder).build(0xc420136380, 0xc42031f450, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:1537 +0xadc
main.(*builder).do.func1(0xc42031f450)
	/usr/local/go/src/cmd/go/build.go:1302 +0x7d
main.(*builder).do.func2(0xc420254370, 0xc420136380, 0xc42013df20)
	/usr/local/go/src/cmd/go/build.go:1361 +0x145
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 38 [syscall]:
syscall.Syscall6(0xad, 0x1, 0x10a48, 0xc420527118, 0x24, 0x0, 0x0, 0x1767770, 0x0, 0xc4201e41a0)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
os.(*Process).blockUntilWaitable(0xc4203ca8d0, 0xc4202c4160, 0xc4201e4220, 0x12)
	/usr/local/go/src/os/wait_waitid.go:28 +0xa5
os.(*Process).wait(0xc4203ca8d0, 0xc420177000, 0xc4204d4030, 0xc420096240)
	/usr/local/go/src/os/exec_unix.go:22 +0x4d
os.(*Process).Wait(0xc4203ca8d0, 0x0, 0x0, 0x14b4810)
	/usr/local/go/src/os/exec.go:115 +0x2b
os/exec.(*Cmd).Wait(0xc4202c4160, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:435 +0x62
os/exec.(*Cmd).Run(0xc4202c4160, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:280 +0x5c
main.(*builder).runOut(0xc420136380, 0xc4203eddb0, 0x4d, 0xc420120800, 0x31, 0x0, 0x0, 0x0, 0xc4202c4000, 0xe, ...)
	/usr/local/go/src/cmd/go/build.go:2141 +0x42b
main.gcToolchain.gc(0xc420136380, 0xc4204b5680, 0xc420115b80, 0x76, 0xc420115b00, 0x7a, 0xc4201fd400, 0xc4201e4040, 0x2, 0x2, ...)
	/usr/local/go/src/cmd/go/build.go:2401 +0xfc1
main.(*gcToolchain).gc(0x16b1380, 0xc420136380, 0xc4204b5680, 0xc420115b80, 0x76, 0xc420115b00, 0x7a, 0x0, 0xc4201e4040, 0x2, ...)
	<autogenerated>:5 +0x105
main.(*builder).build(0xc420136380, 0xc42031edd0, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:1537 +0xadc
main.(*builder).do.func1(0xc42031edd0)
	/usr/local/go/src/cmd/go/build.go:1302 +0x7d
main.(*builder).do.func2(0xc420254370, 0xc420136380, 0xc42013df20)
	/usr/local/go/src/cmd/go/build.go:1361 +0x145
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 39 [syscall]:
syscall.Syscall6(0xad, 0x1, 0x10a4b, 0xc42052b118, 0x24, 0x0, 0x0, 0x17680d0, 0x0, 0xc4202ba1e0)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
os.(*Process).blockUntilWaitable(0xc42035c3f0, 0xc4203022c0, 0xc4202ba260, 0x1a)
	/usr/local/go/src/os/wait_waitid.go:28 +0xa5
os.(*Process).wait(0xc42035c3f0, 0xc4204dc800, 0xc4202b6030, 0xc4200981a0)
	/usr/local/go/src/os/exec_unix.go:22 +0x4d
os.(*Process).Wait(0xc42035c3f0, 0x0, 0x0, 0x14b4810)
	/usr/local/go/src/os/exec.go:115 +0x2b
os/exec.(*Cmd).Wait(0xc4203022c0, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:435 +0x62
os/exec.(*Cmd).Run(0xc4203022c0, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:280 +0x5c
main.(*builder).runOut(0xc420136380, 0xc420113b00, 0x54, 0xc420247900, 0x38, 0x0, 0x0, 0x0, 0xc4202382c0, 0x17, ...)
	/usr/local/go/src/cmd/go/build.go:2141 +0x42b
main.gcToolchain.gc(0xc420136380, 0xc42027f680, 0xc4201a6000, 0x7d, 0xc420446750, 0x81, 0xc4201fd400, 0xc4202ba020, 0x2, 0x2, ...)
	/usr/local/go/src/cmd/go/build.go:2401 +0xfc1
main.(*gcToolchain).gc(0x16b1380, 0xc420136380, 0xc42027f680, 0xc4201a6000, 0x7d, 0xc420446750, 0x81, 0x0, 0xc4202ba020, 0x2, ...)
	<autogenerated>:5 +0x105
main.(*builder).build(0xc420136380, 0xc42031f040, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:1537 +0xadc
main.(*builder).do.func1(0xc42031f040)
	/usr/local/go/src/cmd/go/build.go:1302 +0x7d
main.(*builder).do.func2(0xc420254370, 0xc420136380, 0xc42013df20)
	/usr/local/go/src/cmd/go/build.go:1361 +0x145
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 40 [running]:
	goroutine running on other thread; stack unavailable
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 41 [syscall]:
syscall.Syscall6(0xad, 0x1, 0x10a46, 0xc420517118, 0x24, 0x0, 0x0, 0x1766e10, 0x0, 0xc42000c520)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
os.(*Process).blockUntilWaitable(0xc420270c60, 0xc420414160, 0xc42000c580, 0x14)
	/usr/local/go/src/os/wait_waitid.go:28 +0xa5
os.(*Process).wait(0xc420270c60, 0xc420469400, 0xc42000e050, 0xc4200ae000)
	/usr/local/go/src/os/exec_unix.go:22 +0x4d
os.(*Process).Wait(0xc420270c60, 0x0, 0x0, 0x14b4810)
	/usr/local/go/src/os/exec.go:115 +0x2b
os/exec.(*Cmd).Wait(0xc420414160, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:435 +0x62
os/exec.(*Cmd).Run(0xc420414160, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:280 +0x5c
main.(*builder).runOut(0xc420136380, 0xc420391b60, 0x5d, 0xc420353680, 0x41, 0x0, 0x0, 0x0, 0xc420414000, 0x10, ...)
	/usr/local/go/src/cmd/go/build.go:2141 +0x42b
main.gcToolchain.gc(0xc420136380, 0xc4203cdb00, 0xc420446510, 0x86, 0xc420446480, 0x8a, 0xc4201fd400, 0xc42000c1e0, 0x2, 0x2, ...)
	/usr/local/go/src/cmd/go/build.go:2401 +0xfc1
main.(*gcToolchain).gc(0x16b1380, 0xc420136380, 0xc4203cdb00, 0xc420446510, 0x86, 0xc420446480, 0x8a, 0x0, 0xc42000c1e0, 0x2, ...)
	<autogenerated>:5 +0x105
main.(*builder).build(0xc420136380, 0xc42031eb60, 0x0, 0x0)
	/usr/local/go/src/cmd/go/build.go:1537 +0xadc
main.(*builder).do.func1(0xc42031eb60)
	/usr/local/go/src/cmd/go/build.go:1302 +0x7d
main.(*builder).do.func2(0xc420254370, 0xc420136380, 0xc42013df20)
	/usr/local/go/src/cmd/go/build.go:1361 +0x145
created by main.(*builder).do
	/usr/local/go/src/cmd/go/build.go:1367 +0x495

goroutine 51 [syscall]:
syscall.Syscall(0x3, 0x20, 0xc420406200, 0x200, 0x0, 0x0, 0x0)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0x20, 0xc420406200, 0x200, 0x200, 0xc4204dcc00, 0x17680d0, 0x0)
	/usr/local/go/src/syscall/zsyscall_darwin_amd64.go:973 +0x55
syscall.Read(0x20, 0xc420406200, 0x200, 0x200, 0x102990f, 0x14b3ed8, 0xc4204f3dc0)
	/usr/local/go/src/syscall/syscall_unix.go:162 +0x49
os.(*File).read(0xc4202b6018, 0xc420406200, 0x200, 0x200, 0x10676ab, 0x13fd9a0, 0x200)
	/usr/local/go/src/os/file_unix.go:165 +0x6a
os.(*File).Read(0xc4202b6018, 0xc420406200, 0x200, 0x200, 0x0, 0x0, 0xc4204f3e60)
	/usr/local/go/src/os/file.go:101 +0x76
bytes.(*Buffer).ReadFrom(0xc42020c380, 0x165cc00, 0xc4202b6018, 0x1a40028, 0xc42020c380, 0x1)
	/usr/local/go/src/bytes/buffer.go:179 +0x160
io.copyBuffer(0x165bbc0, 0xc42020c380, 0x165cc00, 0xc4202b6018, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
	/usr/local/go/src/io/io.go:384 +0x2cb
io.Copy(0x165bbc0, 0xc42020c380, 0x165cc00, 0xc4202b6018, 0x0, 0x0, 0x0)
	/usr/local/go/src/io/io.go:360 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:254 +0x4d
os/exec.(*Cmd).Start.func1(0xc4203022c0, 0xc4202ba260)
	/usr/local/go/src/os/exec/exec.go:371 +0x27
created by os/exec.(*Cmd).Start
	/usr/local/go/src/os/exec/exec.go:372 +0x4e4

goroutine 66 [syscall]:
syscall.Syscall(0x3, 0x14, 0xc42027c200, 0x200, 0xc42027c200, 0x200, 0xc42019e56a)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0x14, 0xc42027c200, 0x200, 0x200, 0xc420129000, 0x1766e10, 0x0)
	/usr/local/go/src/syscall/zsyscall_darwin_amd64.go:973 +0x55
syscall.Read(0x14, 0xc42027c200, 0x200, 0x200, 0x102990f, 0x14b3ed8, 0xc4204f95c0)
	/usr/local/go/src/syscall/syscall_unix.go:162 +0x49
os.(*File).read(0xc4204d4018, 0xc42027c200, 0x200, 0x200, 0x10676ab, 0x13fd9a0, 0x200)
	/usr/local/go/src/os/file_unix.go:165 +0x6a
os.(*File).Read(0xc4204d4018, 0xc42027c200, 0x200, 0x200, 0xc420440e00, 0xc4204f9670, 0xc4204f9660)
	/usr/local/go/src/os/file.go:101 +0x76
bytes.(*Buffer).ReadFrom(0xc42016e380, 0x165cc00, 0xc4204d4018, 0x1a40028, 0xc42016e380, 0x1)
	/usr/local/go/src/bytes/buffer.go:179 +0x160
io.copyBuffer(0x165bbc0, 0xc42016e380, 0x165cc00, 0xc4204d4018, 0x0, 0x0, 0x0, 0x1, 0x100000000000000, 0xc42031edd0)
	/usr/local/go/src/io/io.go:384 +0x2cb
io.Copy(0x165bbc0, 0xc42016e380, 0x165cc00, 0xc4204d4018, 0xc42019e4b0, 0x13b2842, 0x200001)
	/usr/local/go/src/io/io.go:360 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0x180001, 0x0)
	/usr/local/go/src/os/exec/exec.go:254 +0x4d
os/exec.(*Cmd).Start.func1(0xc4202c4160, 0xc4201e4220)
	/usr/local/go/src/os/exec/exec.go:371 +0x27
created by os/exec.(*Cmd).Start
	/usr/local/go/src/os/exec/exec.go:372 +0x4e4

goroutine 114 [syscall]:
syscall.Syscall(0x3, 0x11, 0xc42041a200, 0x200, 0xc42041a200, 0x200, 0x0)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0x11, 0xc42041a200, 0x200, 0x200, 0xc420262400, 0x1767770, 0x0)
	/usr/local/go/src/syscall/zsyscall_darwin_amd64.go:973 +0x55
syscall.Read(0x11, 0xc42041a200, 0x200, 0x200, 0x102990f, 0x14b3ed8, 0xc4204f7dc0)
	/usr/local/go/src/syscall/syscall_unix.go:162 +0x49
os.(*File).read(0xc4202b6060, 0xc42041a200, 0x200, 0x200, 0x10676ab, 0x13fd9a0, 0x200)
	/usr/local/go/src/os/file_unix.go:165 +0x6a
os.(*File).Read(0xc4202b6060, 0xc42041a200, 0x200, 0x200, 0x10328be, 0xc42030a000, 0xc4204f7e60)
	/usr/local/go/src/os/file.go:101 +0x76
bytes.(*Buffer).ReadFrom(0xc4202aea10, 0x165cc00, 0xc4202b6060, 0x1a40028, 0xc4202aea10, 0xc4204f7f01)
	/usr/local/go/src/bytes/buffer.go:179 +0x160
io.copyBuffer(0x165bbc0, 0xc4202aea10, 0x165cc00, 0xc4202b6060, 0x0, 0x0, 0x0, 0xc4204d61d8, 0x0, 0x0)
	/usr/local/go/src/io/io.go:384 +0x2cb
io.Copy(0x165bbc0, 0xc4202aea10, 0x165cc00, 0xc4202b6060, 0x13f9ae0, 0xc4204d6180, 0xc4204f7fb0)
	/usr/local/go/src/io/io.go:360 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0x13f9ae0, 0xc4204d6180)
	/usr/local/go/src/os/exec/exec.go:254 +0x4d
os/exec.(*Cmd).Start.func1(0xc42037c6e0, 0xc4202baa60)
	/usr/local/go/src/os/exec/exec.go:371 +0x27
created by os/exec.(*Cmd).Start
	/usr/local/go/src/os/exec/exec.go:372 +0x4e4

goroutine 98 [syscall]:
syscall.Syscall(0x3, 0xc, 0xc4201aa200, 0x200, 0x2, 0x2, 0xc42019e567)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0xc, 0xc4201aa200, 0x200, 0x200, 0xc4204db000, 0x17664b0, 0x0)
	/usr/local/go/src/syscall/zsyscall_darwin_amd64.go:973 +0x55
syscall.Read(0xc, 0xc4201aa200, 0x200, 0x200, 0x102990f, 0x14b3ed8, 0xc42002fdc0)
	/usr/local/go/src/syscall/syscall_unix.go:162 +0x49
os.(*File).read(0xc42000e038, 0xc4201aa200, 0x200, 0x200, 0x10676ab, 0x13fd9a0, 0x200)
	/usr/local/go/src/os/file_unix.go:165 +0x6a
os.(*File).Read(0xc42000e038, 0xc4201aa200, 0x200, 0x200, 0xc420440e00, 0xc42002fe70, 0xc42002fe60)
	/usr/local/go/src/os/file.go:101 +0x76
bytes.(*Buffer).ReadFrom(0xc42010e850, 0x165cc00, 0xc42000e038, 0x1a40028, 0xc42010e850, 0x1)
	/usr/local/go/src/bytes/buffer.go:179 +0x160
io.copyBuffer(0x165bbc0, 0xc42010e850, 0x165cc00, 0xc42000e038, 0x0, 0x0, 0x0, 0x1, 0x100000000000000, 0xc42031eb60)
	/usr/local/go/src/io/io.go:384 +0x2cb
io.Copy(0x165bbc0, 0xc42010e850, 0x165cc00, 0xc42000e038, 0xc42019e4b0, 0x13b2842, 0x200001)
	/usr/local/go/src/io/io.go:360 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0x180001, 0x0)
	/usr/local/go/src/os/exec/exec.go:254 +0x4d
os/exec.(*Cmd).Start.func1(0xc420414160, 0xc42000c580)
	/usr/local/go/src/os/exec/exec.go:371 +0x27
created by os/exec.(*Cmd).Start
	/usr/local/go/src/os/exec/exec.go:372 +0x4e4

goroutine 52 [syscall]:
syscall.Syscall(0x3, 0x9, 0xc42027cc00, 0x200, 0xc42027cc00, 0x200, 0x0)
	/usr/local/go/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0x9, 0xc42027cc00, 0x200, 0x200, 0xc420476000, 0x1766e10, 0x0)
	/usr/local/go/src/syscall/zsyscall_darwin_amd64.go:973 +0x55
syscall.Read(0x9, 0xc42027cc00, 0x200, 0x200, 0x102990f, 0x14b3ed8, 0xc4204f45c0)
	/usr/local/go/src/syscall/syscall_unix.go:162 +0x49
os.(*File).read(0xc4202b6048, 0xc42027cc00, 0x200, 0x200, 0x10676ab, 0x13fd9a0, 0x200)
	/usr/local/go/src/os/file_unix.go:165 +0x6a
os.(*File).Read(0xc4202b6048, 0xc42027cc00, 0x200, 0x200, 0x0, 0x0, 0xc4204f4660)
	/usr/local/go/src/os/file.go:101 +0x76
bytes.(*Buffer).ReadFrom(0xc42020c930, 0x165cc00, 0xc4202b6048, 0x1a40028, 0xc42020c930, 0x1)
	/usr/local/go/src/bytes/buffer.go:179 +0x160
io.copyBuffer(0x165bbc0, 0xc42020c930, 0x165cc00, 0xc4202b6048, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
	/usr/local/go/src/io/io.go:384 +0x2cb
io.Copy(0x165bbc0, 0xc42020c930, 0x165cc00, 0xc4202b6048, 0x0, 0x0, 0x0)
	/usr/local/go/src/io/io.go:360 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:254 +0x4d
os/exec.(*Cmd).Start.func1(0xc420302580, 0xc4202ba780)
	/usr/local/go/src/os/exec/exec.go:371 +0x27
created by os/exec.(*Cmd).Start
	/usr/local/go/src/os/exec/exec.go:372 +0x4e4
go build github.com/highwire/binsvc/vendor/github.com/phayes/errors: /usr/local/go/pkg/tool/darwin_amd64/compile: exit status 2

[ianlancetaylor]

I don't see how this could happen, either on Go 1.8 or on tip. Before starting a new thread, we block all signals using pthread_sigmask. The new thread is expected to inherit that signal mask. The new thread installs a signal stack before it unblocks any signals.

If you can somehow get it to happen again, a dtrace of the system calls might help identify what is going wrong.

[jimrobinson]

Talking out my tail end, I was wondering if resizing the terminal might send a signal to the running program (go build in this case), and if it arrived at just the right moment it might trigger a race condition. E.g., a SIGWINCH arriving at just the wrong moment.

[ianlancetaylor]

@jimrobinson I agree that it pretty much has to be a race condition as you describe. What I was trying to say in my last comment is that as far as I can see from reading the code such a race condition is impossible. Clearly I am wrong, but how?