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runtime: "fatal error: schedule: holding locks" during runtime.Stack() #9321

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runtime: "fatal error: schedule: holding locks" during runtime.Stack()#9321
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Go1.4.1
@rina-sleeping

Description

@rina-sleeping
rina-sleeping
opened on Dec 15, 2014

info

  1. What version of Go are you using (go version)?
    • go version go1.4 linux/amd64.
  2. What operating system and processor architecture are you using?
    • Ubuntu 12.04LTS 64bit, Linux 3.8.0-41-generic, Core i7-4770.
  3. What did you do?
    • Run the following test with GOMAXPROCS=4.
  4. What did you expect to see?
    • pass the test.
  5. What did you see instead?
    • "fatal error: schedule: holding locks" occurred.

test code

func TestRepro(t *testing.T) {
    var wg sync.WaitGroup
    wg.Add(2)
    test := func() {
        for i := 0; i < 100; i++ {
            buf := &bytes.Buffer{}
            pprof.Lookup("goroutine").WriteTo(buf, 2)
        }
        wg.Done()
    }

    go test()
    go test()
    wg.Wait()
}

result

=== RUN TestRepro-4
fatal error: schedule: holding locks

runtime stack:
runtime.throw(0x5fce0a)
    /usr/local/go/src/runtime/panic.go:491 +0xad
schedule()
    /usr/local/go/src/runtime/proc.c:1542 +0x45
runtime.park_m(0xc2080007e0)
    /usr/local/go/src/runtime/proc.c:1654 +0x113
runtime.mcall(0x42da74)
    /usr/local/go/src/runtime/asm_amd64.s:186 +0x5a

goroutine 1 [chan receive]:
testing.RunTests(0x58eb80, 0x5ff370, 0x1, 0x1, 0xe6ed7f7c23f1d501)
    /usr/local/go/src/testing/testing.go:556 +0xad6
testing.(*M).Run(0xc20806a0a0, 0x60b9a0)
    /usr/local/go/src/testing/testing.go:485 +0x6c
main.main()
    _/home/rina/repro/_test/_testmain.go:52 +0x1d5

goroutine 5 [semacquire]:
sync.(*WaitGroup).Wait(0xc20808c000)
    /usr/local/go/src/sync/waitgroup.go:132 +0x169
_/home/rina/repro.TestRepro(0xc208088000)
    /home/rina/repro/sample_test.go:23 +0xba
testing.tRunner(0xc208088000, 0x5ff370)
    /usr/local/go/src/testing/testing.go:447 +0xbf
created by testing.RunTests
    /usr/local/go/src/testing/testing.go:555 +0xa8b

goroutine 17 [semacquire]:
runtime.Stack(0xc208098000, 0x100000, 0x100000, 0xc208098001, 0x100000)
    /usr/local/go/src/runtime/mprof.go:581 +0x55
runtime/pprof.writeGoroutineStacks(0x7f2b76ce2c20, 0xc2080100e0, 0x0, 0x0)
    /usr/local/go/src/runtime/pprof/pprof.go:511 +0x8d
runtime/pprof.writeGoroutine(0x7f2b76ce2c20, 0xc2080100e0, 0x2, 0x0, 0x0)
    /usr/local/go/src/runtime/pprof/pprof.go:500 +0x4f
runtime/pprof.(*Profile).WriteTo(0x5ff9a0, 0x7f2b76ce2c20, 0xc2080100e0, 0x2, 0x0, 0x0)
    /usr/local/go/src/runtime/pprof/pprof.go:229 +0xd5
_/home/rina/repro.func·001()
    /home/rina/repro/sample_test.go:16 +0xce
created by _/home/rina/repro.TestRepro
    /home/rina/repro/sample_test.go:21 +0x9b

goroutine 18 [running]:
    goroutine running on other thread; stack unavailable
created by _/home/rina/repro.TestRepro
    /home/rina/repro/sample_test.go:22 +0xaa
exit status 2
FAIL    _/home/rina/repro   0.030s

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