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[Bug nptl/20719] glibc: canceled pthread_cond_wait invokes wrong internal cleanup handler, leading to OOB write


https://sourceware.org/bugzilla/show_bug.cgi?id=20719

--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
Created attachment 9585
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9585&action=edit
unwind-c.c instrumentation patch

I could not reproduce the race with a conditional breakpoint in
__gcc_personality_v0, so I had to instrument it and use an unconditional
breakpoint on unwind_break_on_pc, after setting unwind_break_pc.

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