panic when interupting program with many goroutines #1279
Description
What steps will reproduce the problem?
I've got it down to the following test program:
package main
func main() {
for i := 0; i < 5000; i++ {
go func() {
}()
}
for i := 0; i < 5000; i++ {
print(i, "\n")
}
}
./6.out |more
^C after one page of output
What do you see instead?
panic: runtime error: invalid memory address or nil pointer dereference
panic PC=0x25cf08
runtime.panic+0xb2 /Users/dadkins/go/src/pkg/runtime/proc.c:1028
runtime.panic(0xfa6c, 0x2591f0)
runtime.panicstring+0x69 /Users/dadkins/go/src/pkg/runtime/runtime.c:86
runtime.panicstring(0x2183c, 0x25cfb8)
runtime.sigpanic+0x144 /Users/dadkins/go/src/pkg/runtime/darwin/thread.c:460
runtime.sigpanic()
runtime.notok+0x5 /Users/dadkins/go/src/pkg/runtime/darwin/amd64/sys.s:118
runtime.notok()
runtime.write+0x1b /Users/dadkins/go/src/pkg/runtime/darwin/amd64/sys.s:40
runtime.write()
runtime.printuint+0x7f /Users/dadkins/go/src/pkg/runtime/print.c:289
runtime.printuint(0xdfd, 0xe004)
runtime.printint+0x55 /Users/dadkins/go/src/pkg/runtime/print.c:299
runtime.printint(0xdfd, 0x1)
main.main+0x7d /Users/dadkins/tst/go/sched.go:11
main.main()
runtime.mainstart+0xf /Users/dadkins/go/src/pkg/runtime/amd64/asm.s:77
runtime.mainstart()
runtime.goexit /Users/dadkins/go/src/pkg/runtime/proc.c:146
runtime.goexit()
goroutine 4001 [1]:
goroutine 4000 [1]:
...
Which compiler are you using (5g, 6g, 8g, gccgo)?
6g
Which operating system are you using?
Mac OS X
Which revision are you using? (hg identify)
03404c0155f6 tip
Please provide any additional information below.
The output loop is essential to reproducing the bug. I tried replacing it with
time.Sleep(10e9) but that worked.