[Bug nptl/13690] pthread_mutex_unlock potentially cause invalid access

["triegel at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

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

--- Comment #47 from Torvald Riegel <triegel at redhat dot com> ---
This would increase the unlock latency whenever there is any waiter (because we
let the kernel do it, and after it has found and acquired the futex lock).  I
don't have numbers for this increase, but if there's a non-neglible increase in
latency, then I wouldn't want to see this in glibc.

I still think that the only thing we need to fix is to make sure that no
program can interpret a spurious wake-up (by a pending futex_wake) as a real
wake-up.

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