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[Bug nptl/13690] pthread_mutex_unlock potentially cause invalid access


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

--- Comment #43 from Rich Felker <bugdal at aerifal dot cx> ---
Indeed, it's not testing that, but the syscall does return success. Just change
the futex syscall line to if (!syscall(...)) and remove the final semicolon and
it still eventually ends with Killed.

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