05511a5c0a
After CL 182657 we no longer hold worldsema across the GC, we hold gcsema instead. However in STW GC mode we don't release worldsema before calling Gosched on the user goroutine (note that user goroutines are disabled during STW GC) so that user goroutine holds onto it. When the GC is done and the runtime inevitably wants to "stop the world" again (though there isn't much to stop) it'll sit there waiting for worldsema which won't be released until the aforementioned goroutine is scheduled, which it won't be until the GC is done! So, we have a deadlock. The fix is easy: just release worldsema before calling Gosched. Fixes #34736. Change-Id: Ia50db22ebed3176114e7e60a7edaf82f8535c1b4 Reviewed-on: https://go-review.googlesource.com/c/go/+/208379 Run-TryBot: Michael Knyszek <mknyszek@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com> |
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