[Bug nptl/5240] Pthread hang where there are still waiters when mutex is in "unlocked" state.

["rsa at us dot ibm dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From rsa at us dot ibm dot com  2007-11-27 23:20 -------
Created an attachment (id=2112)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2112&action=view)
Simplified testcase with cleaner termination path.

The fixed worked perfectly on POWER6.  On POWER5 I kept running into a
segmentation fault in the exit() path of the test-case.

The test-case is problematic since the exit() in the child thread's
thread_exit() function causes process termination which ends up sending two
threads down the glibc exit() pipeline at the same time and the linked list of
exit handlers and ends up dereferencing a pointer which has already been
zeroed.

I've modified the test case to demonstrate a more appropriate exit strategy
(which also ends up simplifying the testcase).

I think this bug is resolved.

Thanks for the fix Ulrich.

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http://sourceware.org/bugzilla/show_bug.cgi?id=5240

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