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runtime: fatal error: stoplockedm: inconsistent locking #18178

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bradfitz opened this issue Dec 3, 2016 · 5 comments
Closed

runtime: fatal error: stoplockedm: inconsistent locking #18178

bradfitz opened this issue Dec 3, 2016 · 5 comments
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Go1.8Maybe

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@bradfitz
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bradfitz commented Dec 3, 2016

freebsd-386-gce101 at 6270c5a

https://build.golang.org/log/ce4de82bc9e073e9f2f95b49b2f20ce6954d1876

##### ../misc/cgo/errors
test union2 failed unexpectedly with expensive checks: exit status 2
=== test union2 output ===
fatal error: stoplockedm: inconsistent locking

runtime stack:
runtime.throw(0x80a1f7b, 0x21)
	/tmp/workdir/go/src/runtime/panic.go:596 +0x76
runtime.stoplockedm()
	/tmp/workdir/go/src/runtime/proc.go:1758 +0x4b
runtime.schedule()
	/tmp/workdir/go/src/runtime/proc.go:2150 +0x287
runtime.goschedImpl(0x38e000f0)
	/tmp/workdir/go/src/runtime/proc.go:2270 +0xcc
runtime.gopreempt_m(0x38e000f0)
	/tmp/workdir/go/src/runtime/proc.go:2285 +0x26
runtime.newstack(0x0)
	/tmp/workdir/go/src/runtime/stack.go:1056 +0x25c
runtime.morestack()
	/tmp/workdir/go/src/runtime/asm_386.s:409 +0x6e

goroutine 1 [runnable]:
main._Cfunc_f(0x38e74000)
	dir29/_obj/_cgo_gotypes.go:47 +0x2d
main.main()
	/tmp/cgoerrors981982312/src/dir29/t29.go:11 +0x56

goroutine 17 [syscall, locked to thread]:
runtime.goexit()
	/tmp/workdir/go/src/runtime/asm_386.s:1629 +0x1
=== end of test union2 output ===
exit status 1
2016/12/02 21:39:29 Failed: exit status 1
2016/12/02 21:39:29 FAILED

Austin, is this new?
@bradfitz bradfitz added this to the Go1.8Maybe milestone Dec 3, 2016
@aclements
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This is the only instance of "stoplockedm: inconsistent locking" ever.

I wonder if this is related to #15658 and is just random memory corruption. There's a lot of forking/execing going on around this test, though the crashing binary itself didn't fork/exec.

Obviously it's too late for this instance, but I wonder if it would be possible to get core dumps or something out of the builders for runtime crashes. Something to make post-mortem debugging easier than feeling around in the dark.

@aclements
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Closing since this has only happened once. Reopen if we ever see this again.

@filipevarjao
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I have get the same issue, but it is random error, I made some changes inside the runtime but nothing that affect this part directly (I mean the stoplockedm), but as I'm compiling the whole language many times per day, so I'm getting this error each 5 of 10 times when I run ./all.bash.

@ianlancetaylor
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This issue was closed a long time ago. Whatever you are encountering, it is a different problem. Please open a new issue. But please only open the issue if you are encountering a problem with unmodified sources. If you only encounter the problem with your runtime modifications, then the problem is almost certainly due to your modifications.

@filipevarjao
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I do not believe that any change that I made has cause this error, as you see @bradfitz got the same, with the same version go1.8, I'll not open a new issue cause I made some modifications at runtime, but I'm still comparing with a stable release of 1.8, if I catch this error again with the stable version I will report.

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