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ahmetb opened this issue Jul 22, 2016 · 6 comments
Closed

runtime: go build panicked with "non-Go code disabled sigaltstack" #16468

ahmetb opened this issue Jul 22, 2016 · 6 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. OS-Darwin
Milestone
Go1.8

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@ahmetb
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ahmetb commented Jul 22, 2016 •
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Please answer these questions before submitting your issue. Thanks!

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

go version go1.6.2 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=""
GORACE=""
GOROOT="/usr/local/Cellar/go/1.6.2/libexec"
GOTOOLDIR="/usr/local/Cellar/go/1.6.2/libexec/pkg/tool/darwin_amd64"
GO15VENDOREXPERIMENT="1"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fno-common"
CXX="clang++"
CGO_ENABLED="1"

3. What did you do?

First of all I was not able to reproduce this error ever again It was an one-off thing and when I googled the error only the source code came up, so reporting.

It occurred when I was doing go build on(&to) darwin/amd64.

4. What did you expect to see?

go build to work.

5. What did you see instead?

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

goroutine 17 [running, locked to thread]:
runtime.throw(0x6756a0, 0x20)
    /usr/local/Cellar/go/1.6.2/libexec/src/runtime/panic.go:547 +0x90 fp=0xc82003aec8 sp=0xc82003aeb0
runtime.noSignalStack(0xc80000001c)
    /usr/local/Cellar/go/1.6.2/libexec/src/runtime/signal1_unix.go:300 +0x84 fp=0xc82003aee0 sp=0xc82003aec8
runtime.call32(0x0, 0xc8204c43d0, 0xc8204c4474, 0x4)
    /usr/local/Cellar/go/1.6.2/libexec/src/runtime/asm_amd64.s:472 +0x3e fp=0xc82003af08 sp=0xc82003aee0
runtime.cgocallbackg1()
    /usr/local/Cellar/go/1.6.2/libexec/src/runtime/cgocall.go:267 +0x10c fp=0xc82003af40 sp=0xc82003af08
runtime.cgocallbackg()
    /usr/local/Cellar/go/1.6.2/libexec/src/runtime/cgocall.go:180 +0xd7 fp=0xc82003afa0 sp=0xc82003af40
runtime.cgocallback_gofunc(0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/runtime/asm_amd64.s:716 +0x60 fp=0xc82003afb0 sp=0xc82003afa0
runtime.goexit()
    /usr/local/Cellar/go/1.6.2/libexec/src/runtime/asm_amd64.s:1998 +0x1 fp=0xc82003afb8 sp=0xc82003afb0

goroutine 1 [semacquire]:
sync.runtime_Semacquire(0xc82047f4dc)
    /usr/local/Cellar/go/1.6.2/libexec/src/runtime/sema.go:47 +0x26
sync.(*WaitGroup).Wait(0xc82047f4d0)
    /usr/local/Cellar/go/1.6.2/libexec/src/sync/waitgroup.go:127 +0xb4
main.(*builder).do(0xc8201769a0, 0xc8201acc30)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:1323 +0x3c6
main.runBuild(0x888ae0, 0xc82000a370, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:479 +0x4dc
main.main()
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/main.go:181 +0x783

goroutine 5 [syscall]:
os/signal.signal_recv(0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/runtime/sigqueue.go:116 +0x132
os/signal.loop()
    /usr/local/Cellar/go/1.6.2/libexec/src/os/signal/signal_unix.go:22 +0x18
created by os/signal.init.1
    /usr/local/Cellar/go/1.6.2/libexec/src/os/signal/signal_unix.go:28 +0x37

goroutine 8 [running]:
    goroutine running on other thread; stack unavailable
created by main.(*builder).do
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:1320 +0x39e

goroutine 9 [syscall]:
syscall.Syscall6(0x7, 0x1246e, 0xc8204c2dcc, 0x0, 0xc820405ef0, 0x0, 0x0, 0xc8204c2da8, 0xdef30, 0xc8204c2da0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/asm_darwin_amd64.s:41 +0x5
syscall.wait4(0x1246e, 0xc8204c2dcc, 0x0, 0xc820405ef0, 0x90, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/zsyscall_darwin_amd64.go:34 +0x7f
syscall.Wait4(0x1246e, 0xc8204c2e14, 0x0, 0xc820405ef0, 0xc82012c700, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/syscall_bsd.go:129 +0x55
os.(*Process).wait(0xc8200fc400, 0x2e, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec_unix.go:22 +0x105
os.(*Process).Wait(0xc8200fc400, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/doc.go:49 +0x2d
os/exec.(*Cmd).Wait(0xc82029b180, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:396 +0x211
os/exec.(*Cmd).Run(0xc82029b180, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:262 +0x64
main.(*builder).runOut(0xc8201769a0, 0xc82040fac0, 0x33, 0xc82029edc1, 0xc, 0x0, 0x0, 0x0, 0xc82047d760, 0x10, ...)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:2049 +0x364
main.gcToolchain.gc(0xc8201769a0, 0xc8203dcc00, 0xc82041cea0, 0x51, 0xc82041cde0, 0x55, 0x0, 0xc8200fc020, 0x2, 0x2, ...)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:2310 +0x1261
main.(*gcToolchain).gc(0x8acf60, 0xc8201769a0, 0xc8203dcc00, 0xc82041cea0, 0x51, 0xc82041cde0, 0x55, 0x0, 0xc8200fc020, 0x2, ...)
    <autogenerated>:3 +0x18e
main.(*builder).build(0x10b59c, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:1484 +0x224c
created by main.(*builder).do
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:1320 +0x39e

goroutine 10 [syscall]:
syscall.Syscall6(0x7, 0x1245f, 0xc8204aadcc, 0x0, 0xc8203039e0, 0x0, 0x0, 0xc8204aada8, 0xdef30, 0xc8204aada0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/asm_darwin_amd64.s:41 +0x5
syscall.wait4(0x1245f, 0xc8204aadcc, 0x0, 0xc8203039e0, 0x90, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/zsyscall_darwin_amd64.go:34 +0x7f
syscall.Wait4(0x1245f, 0xc8204aae14, 0x0, 0xc8203039e0, 0xc8204fe530, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/syscall_bsd.go:129 +0x55
os.(*Process).wait(0xc8203491c0, 0x2e, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec_unix.go:22 +0x105
os.(*Process).Wait(0xc8203491c0, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/doc.go:49 +0x2d
os/exec.(*Cmd).Wait(0xc820427680, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:396 +0x211
os/exec.(*Cmd).Run(0xc820427680, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:262 +0x64
main.(*builder).runOut(0xc8201769a0, 0xc8200b0a50, 0x2a, 0xc8201fe871, 0x3, 0x0, 0x0, 0x0, 0xc82018bb80, 0x3d, ...)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:2049 +0x364
main.gcToolchain.gc(0xc8201769a0, 0xc8202a3400, 0xc8203edb80, 0x48, 0xc8203eda90, 0x4c, 0x0, 0xc820370fa0, 0x2, 0x2, ...)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:2310 +0x1261
main.(*gcToolchain).gc(0x8acf60, 0xc8201769a0, 0xc8202a3400, 0xc8203edb80, 0x48, 0xc8203eda90, 0x4c, 0x0, 0xc820370fa0, 0x2, ...)
    <autogenerated>:3 +0x18e
main.(*builder).build(0xc8201769a0, 0xc8203f88f0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:1484 +0x224c
main.(*builder).do.func1(0xc8203f88f0)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:1257 +0x3b2
main.(*builder).do.func2(0xc82047f4d0, 0xc8201769a0, 0xc82048fd00)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:1314 +0x156
created by main.(*builder).do
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:1320 +0x39e

goroutine 11 [syscall]:
syscall.Syscall6(0x7, 0x12472, 0xc8204c6dcc, 0x0, 0xc820080bd0, 0x0, 0x0, 0xc8204c6da8, 0xdef30, 0xc8204c6da0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/asm_darwin_amd64.s:41 +0x5
syscall.wait4(0x12472, 0xc8204c6dcc, 0x0, 0xc820080bd0, 0x90, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/zsyscall_darwin_amd64.go:34 +0x7f
syscall.Wait4(0x12472, 0xc8204c6e14, 0x0, 0xc820080bd0, 0xc82012c7c0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/syscall_bsd.go:129 +0x55
os.(*Process).wait(0xc8200fd460, 0x2e, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec_unix.go:22 +0x105
os.(*Process).Wait(0xc8200fd460, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/doc.go:49 +0x2d
os/exec.(*Cmd).Wait(0xc82029b7c0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:396 +0x211
os/exec.(*Cmd).Run(0xc82029b7c0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:262 +0x64
main.(*builder).runOut(0xc8201769a0, 0xc8201b5080, 0x2f, 0xc82047e171, 0x8, 0x0, 0x0, 0x0, 0xc8201cc2c0, 0x20, ...)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:2049 +0x364
main.gcToolchain.gc(0xc8201769a0, 0xc8203dd000, 0xc8203ec280, 0x4d, 0xc82041de00, 0x51, 0x1, 0xc8200fd0a0, 0x2, 0x2, ...)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:2310 +0x1261
main.(*gcToolchain).gc(0x8acf60, 0xc8201769a0, 0xc8203dd000, 0xc8203ec280, 0x4d, 0xc82041de00, 0x51, 0x1, 0xc8200fd0a0, 0x2, ...)
    <autogenerated>:3 +0x18e
main.(*builder).build(0xc8201769a0, 0xc82027bad0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:1484 +0x224c
main.(*builder).do.func1(0xc82027bad0)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:1257 +0x3b2
main.(*builder).do.func2(0xc82047f4d0, 0xc8201769a0, 0xc82048fd00)
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:1314 +0x156
created by main.(*builder).do
    /usr/local/Cellar/go/1.6.2/libexec/src/cmd/go/build.go:1320 +0x39e

goroutine 113 [syscall]:
syscall.Syscall(0x3, 0x4, 0xc820454800, 0x200, 0x0, 0x0, 0x9e679)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0x4, 0xc820454800, 0x200, 0x200, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/zsyscall_darwin_amd64.go:972 +0x5f
syscall.Read(0x4, 0xc820454800, 0x200, 0x200, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/syscall_unix.go:161 +0x4d
os.(*File).read(0xc82012c6f8, 0xc820454800, 0x200, 0x200, 0xc820454800, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/file_unix.go:228 +0x75
os.(*File).Read(0xc82012c6f8, 0xc820454800, 0x200, 0x200, 0x1, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/file.go:95 +0x8a
bytes.(*Buffer).ReadFrom(0xc8202a8a10, 0x9c0b10, 0xc82012c6f8, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/bytes/buffer.go:176 +0x23f
io.copyBuffer(0x9cf4c8, 0xc8202a8a10, 0x9c0b10, 0xc82012c6f8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/io/io.go:374 +0x180
io.Copy(0x9cf4c8, 0xc8202a8a10, 0x9c0b10, 0xc82012c6f8, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/io/io.go:350 +0x64
os/exec.(*Cmd).writerDescriptor.func1(0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:236 +0x8b
os/exec.(*Cmd).Start.func1(0xc82029b180, 0xc8200fc1a0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:344 +0x1d
created by os/exec.(*Cmd).Start
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:345 +0x967

goroutine 126 [syscall]:
syscall.Syscall(0x3, 0x8, 0xc8202bb600, 0x200, 0x0, 0x0, 0x9e679)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0x8, 0xc8202bb600, 0x200, 0x200, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/zsyscall_darwin_amd64.go:972 +0x5f
syscall.Read(0x8, 0xc8202bb600, 0x200, 0x200, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/syscall_unix.go:161 +0x4d
os.(*File).read(0xc8204fe528, 0xc8202bb600, 0x200, 0x200, 0xc8202bb600, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/file_unix.go:228 +0x75
os.(*File).Read(0xc8204fe528, 0xc8202bb600, 0x200, 0x200, 0x1, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/file.go:95 +0x8a
bytes.(*Buffer).ReadFrom(0xc82023e7e0, 0x9c0b10, 0xc8204fe528, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/bytes/buffer.go:176 +0x23f
io.copyBuffer(0x9cf4c8, 0xc82023e7e0, 0x9c0b10, 0xc8204fe528, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/io/io.go:374 +0x180
io.Copy(0x9cf4c8, 0xc82023e7e0, 0x9c0b10, 0xc8204fe528, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/io/io.go:350 +0x64
os/exec.(*Cmd).writerDescriptor.func1(0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:236 +0x8b
os/exec.(*Cmd).Start.func1(0xc820427680, 0xc820348f20)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:344 +0x1d
created by os/exec.(*Cmd).Start
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:345 +0x967

goroutine 149 [syscall]:
syscall.Syscall(0x3, 0x5, 0xc820455000, 0x200, 0x0, 0x0, 0x9e679)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/asm_darwin_amd64.s:16 +0x5
syscall.read(0x5, 0xc820455000, 0x200, 0x200, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/zsyscall_darwin_amd64.go:972 +0x5f
syscall.Read(0x5, 0xc820455000, 0x200, 0x200, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/syscall/syscall_unix.go:161 +0x4d
os.(*File).read(0xc82012c7b8, 0xc820455000, 0x200, 0x200, 0xc820455000, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/file_unix.go:228 +0x75
os.(*File).Read(0xc82012c7b8, 0xc820455000, 0x200, 0x200, 0x1, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/file.go:95 +0x8a
bytes.(*Buffer).ReadFrom(0xc8202a8ee0, 0x9c0b10, 0xc82012c7b8, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/bytes/buffer.go:176 +0x23f
io.copyBuffer(0x9cf4c8, 0xc8202a8ee0, 0x9c0b10, 0xc82012c7b8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/io/io.go:374 +0x180
io.Copy(0x9cf4c8, 0xc8202a8ee0, 0x9c0b10, 0xc82012c7b8, 0x0, 0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/io/io.go:350 +0x64
os/exec.(*Cmd).writerDescriptor.func1(0x0, 0x0)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:236 +0x8b
os/exec.(*Cmd).Start.func1(0xc82029b7c0, 0xc8200fd240)
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:344 +0x1d
created by os/exec.(*Cmd).Start
    /usr/local/Cellar/go/1.6.2/libexec/src/os/exec/exec.go:345 +0x967

goroutine 162 [syscall, locked to thread]:
runtime.goexit()
    /usr/local/Cellar/go/1.6.2/libexec/src/runtime/asm_amd64.s:1998 +0x1
go build github.com/Azure/custom-script-extension-linux/vendor/github.com/Azure/azure-docker-extension/pkg/vmextension/status: /usr/local/Cellar/go/1.6.2/libexec/pkg/tool/darwin_amd64/compile: exit status
@mikioh mikioh changed the title go build panicked with "non-Go code disabled sigaltstack" runtime: go build panicked with "non-Go code disabled sigaltstack" Jul 22, 2016
@mikioh
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mikioh commented Jul 22, 2016

/cc @ianlancetaylor

@ianlancetaylor ianlancetaylor self-assigned this Jul 22, 2016
@ianlancetaylor ianlancetaylor added this to the Go1.8 milestone Jul 22, 2016
@ianlancetaylor
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The signal is SIGWINCH which is normally sent when the window size changes. Where you adjusting the size of your terminal window when it happened?

@ahmetb
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ahmetb commented Jul 22, 2016

@ianlancetaylor yes, I was running iTerm2 and just hit Cmd+D which would split my terminal emulator window horizontally into two. This effectively shrinks my current terminal window where the go build was running.

@carolynvs
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I just ran into this too, with go go1.6.2 darwin/amd64 by maximizing the iterm2 window during go build. I'm able to consistently repro this behavior.

@quentinmit quentinmit added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Oct 11, 2016
@rsc
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rsc commented Oct 27, 2016

It's hard to imagine what the non-Go code is that changed the signal handlers. The obvious answer is the C resolver that the go command is linked against for 'go get'. But this was a 'go build' command, so it shouldn't have been doing any network work at all. Even so the code was there. I tried running a go build github.com/Azure/custom-script-extension-linux/... and send it a SIGWINCH while running and could not reproduce this, neither at tip or at go1.6.

It could be that if there is some C-created thread without a sigaltstack and it takes the signal but runs Go's signal handler. That would crash this way. But I don't see where that C-created thread is coming from in cmd/go.

@ahmetalpbalkan, what version of OS X are you using? Any fancy network firewall or other software?

@ahmetb
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ahmetb commented Oct 27, 2016 •
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@rsc this was a pretty standard OS X 10.11 El Capitan setup with go1.6.2 installed via Homebrew. I am now trying to reproduce this on macOS 10.12 Sierra with go1.7.1. It no longer reproduces. It used to repro very easily by splitting iTerm2 windows while go build was running.

I don't think this issue is important enough to investigate deeper. Closing. Thanks for taking a look.

@ahmetb ahmetb closed this as completed Oct 27, 2016
@ahmetb ahmetb mentioned this issue Dec 2, 2016
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@jimrobinson jimrobinson mentioned this issue Oct 18, 2017
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@golang golang locked and limited conversation to collaborators Oct 27, 2017
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. OS-Darwin
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