Hi All
I'm seeing intermittent crashes in my unit test and wanted to check here
first to see if anyone has suggestions before I filed an official issue.
Go version: go1.10.3 windows/amd64
GOPATH: C:\go
GOROOT: C:\toolss\go
OS: Windows 10 (10.0.17134) Pro
Computer: Dell XPS 15 9560 with intel core i7
I have written a client/server application. Both client and server are on
the same machine and communicate via gRPC over a named pipe. In the unit
tests for the client side I spin up a stubbed server implementation and
connect to it. The tests pass around 75% of the time, but the remaining 25%
of the time they fail with runtime errors like this (I can't give the full
stacktrace as the code is private):
runtime: waitforsingleobject wait_failed; errno=6
fatal error: runtime.semasleep wait_failed
runtime stack:
runtime.throw(0x94ba8a, 0x1d)
C:/tools/go/src/runtime/panic.go:616 +0x88
runtime.semasleep.func2()
C:/tools/go/src/runtime/os_windows.go:579 +0x80
runtime.semasleep(0xffffffffffffffff, 0x0)
C:/tools/go/src/runtime/os_windows.go:577 +0xe7
runtime.notesleep(0xc04225ed18)
C:/tools/go/src/runtime/lock_sema.go:167 +0xf7
runtime.stopm()
C:/tools/go/src/runtime/proc.go:1952 +0xf3
runtime.findrunnable(0xc04202c500, 0x0)
C:/tools/go/src/runtime/proc.go:2415 +0x521
runtime.schedule()
C:/tools/go/src/runtime/proc.go:2541 +0x149
runtime.goexit0(0xc042214f00)
C:/tools/go/src/runtime/proc.go:2713 +0x244
runtime.mcall(0x0)
C:/tools/go/src/runtime/asm_amd64.s:351 +0x5e
goroutine 1 [chan receive]:
testing.(*T).Run(0xc0423b62d0, 0x93fd1d, 0xb, 0x961438, 0x4932ad)
C:/tools/go/src/testing/testing.go:825 +0x308
testing.runTests.func1(0xc0423b61e0)
C:/tools/go/src/testing/testing.go:1063 +0x6b
testing.tRunner(0xc0423b61e0, 0xc042091dd8)
C:/tools/go/src/testing/testing.go:777 +0xd7
testing.runTests(0xc042178ee0, 0xc13f20, 0x9, 0x9, 0x0)
C:/tools/go/src/testing/testing.go:1061 +0x2cb
testing.(*M).Run(0xc04218c280, 0x0)
C:/tools/go/src/testing/testing.go:978 +0x178
path/to/my/client.TestMain(0xc04218c280)
C:/go/src/path/to/my/client/my_client_test.go:390 +0x4e
main.main()
_testmain.go:56 +0x158
.... <rest of stack trace> .....
And like this:
runtime: setevent failed; errno=6
fatal error: runtime.semawakeup
runtime stack:
runtime.throw(0x944972, 0x12)
C:/tools/go/src/runtime/panic.go:616 +0x88
runtime.semawakeup.func1()
C:/tools/go/src/runtime/os_windows.go:597 +0x80
runtime.semawakeup(0xc042204800)
C:/tools/go/src/runtime/os_windows.go:595 +0x53
runtime.notewakeup(0xc042204918)
C:/tools/go/src/runtime/lock_sema.go:147 +0x60
runtime.startm(0x0, 0xc042028001)
C:/tools/go/src/runtime/proc.go:2017 +0xe1
runtime.wakep()
C:/tools/go/src/runtime/proc.go:2083 +0x4f
runtime.resetspinning()
C:/tools/go/src/runtime/proc.go:2454 +0x7f
runtime.schedule()
C:/tools/go/src/runtime/proc.go:2548 +0x133
runtime.goexit0(0xc042348000)
C:/tools/go/src/runtime/proc.go:2713 +0x244
runtime.mcall(0x0)
C:/tools/go/src/runtime/asm_amd64.s:351 +0x5e
goroutine 1 [chan receive]:
testing.(*T).Run(0xc04249a1e0, 0x93fd1d, 0xb, 0x961438, 0x4932ad)
C:/tools/go/src/testing/testing.go:825 +0x308
testing.runTests.func1(0xc04249a0f0)
C:/tools/go/src/testing/testing.go:1063 +0x6b
testing.tRunner(0xc04249a0f0, 0xc042091dd8)
C:/tools/go/src/testing/testing.go:777 +0xd7
testing.runTests(0xc042178ec0, 0xc13f20, 0x9, 0x9, 0x0)
C:/tools/go/src/testing/testing.go:1061 +0x2cb
testing.(*M).Run(0xc04218e280, 0x0)
C:/tools/go/src/testing/testing.go:978 +0x178
path/to/my/client.TestMain(0xc04218e280)
C:/go/src/path/to/my/client/my_client_test.go:390 +0x4e
main.main()
_testmain.go:56 +0x158
.... <rest of stack trace> .....
Errno 6 is Windows jargon for an invalid handle which is an expected error
from WaitForSingleObject (
https://docs.microsoft.com/en-us/windows/desktop/api/synchapi/nf-synchapi-waitforsingleobject).
Has anyone seen this before?
Any help greatly appreciate, and let me know if I can provide more
information.
Cheers
Toby
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