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[Bug nptl/13690] pthread_mutex_unlock potentially cause invalid access


https://sourceware.org/bugzilla/show_bug.cgi?id=13690

--- Comment #45 from Rich Felker <bugdal at aerifal dot cx> ---
But the child provably hasn't exited at the point where the wake occurs, since
the subsequent tgkill syscall succeeds.

However if the issue is just that the kernel is doing these operations in the
wrong order, it probably doesn't cause other spurious wakes to be observed, and
it's probably not relevant to this PR.

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