Source:
--- 8< ---
package main
import (
"os"
"os/signal"
)
func main() {
sigs := make(chan os.Signal)
signal.Notify(sigs, os.Interrupt)
if f := os.NewFile(3, ""); f != nil {
f.Close()
}
<-sigs
}
--- >8 ---
Stack:
--- 8< ---
fatal error: signal_recv: inconsistent state
goroutine 4 [running]:
runtime.throw(0x109865b, 0x1f)
/Users/saj/.homebrew/Cellar/go/1.13.4/libexec/src/runtime/panic.go:774
+0x72 fp=0xc0000337a0 sp=0xc000033770 pc=0x1028922
os/signal.signal_recv(0x0)
/Users/saj/.homebrew/Cellar/go/1.13.4/libexec/src/runtime/sigqueue.go:140
+0x104 fp=0xc0000337c0 sp=0xc0000337a0 pc=0x103d1e4
os/signal.loop()
/Users/saj/.homebrew/Cellar/go/1.13.4/libexec/src/os/signal/signal_unix.go:23
+0x22 fp=0xc0000337e0 sp=0xc0000337c0 pc=0x106bac2
runtime.goexit()
/Users/saj/.homebrew/Cellar/go/1.13.4/libexec/src/runtime/asm_amd64.s:1357
+0x1 fp=0xc0000337e8 sp=0xc0000337e0 pc=0x10524d1
created by os/signal.init.0
/Users/saj/.homebrew/Cellar/go/1.13.4/libexec/src/os/signal/signal_unix.go:29
+0x41
goroutine 1 [chan receive]:
main.main()
/private/var/tmp/shstash-735678213/main.go:16 +0xbf
--- >8 ---
The program was executed _without_ an inherited file on fd 3, i.e.:
% cat <&3
zsh: 3: bad file descriptor
I assumed the runtime had opened its own file, and by blindly closing fd
3 I was interfering with it somehow, but I could not see any obvious
file operations in the sources listed in the stack.
% go version
go version go1.13.4 darwin/amd64
% sw_vers
ProductName: Mac OS X
ProductVersion: 10.14.6
BuildVersion: 18G103
This program does not crash when compiled and executed in the same way
on Linux (go version go1.13.4 linux/amd64).
Cheers.
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