[Bug nptl/13690] pthread_mutex_unlock potentially cause invalid access

[triegel at redhat dot com]

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

--- Comment #42 from Torvald Riegel <triegel at redhat dot com> ---
Rich, thanks for the test case, but the code doesn't checks what the futex
syscall returns.  The issue I'm concerned about is not whether there are
spurious wake-ups, but that a spurious wake-up can incorrectly appear to be a
non-spurious one due to the return value of the futex syscall reporting
success.

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