[Bug nptl/13184] rwlocks can go into dead lock

["bugdal at aerifal dot cx" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13184

Rich Felker <bugdal at aerifal dot cx> changed:

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                 CC|                            |bugdal at aerifal dot cx

--- Comment #1 from Rich Felker <bugdal at aerifal dot cx> 2011-09-12 21:32:43 UTC ---
Please fix your test case; as is, it's invalid because it invokes undefined
behavior as soon as thread_main tries to read automatic storage from
spawn_threads which may have already returned. (I'm getting immediate assertion
failure in cache_get due to n containing nonsense.) You could fix this by
passing n by value (casting it to (void *)) rather than by reference.

I'm very interested in race condition bugs like this since I'm writing a
threads implementation and bugs in glibc/NPTL often end up either pointing to
similar bugs in my code, or lead to ideas for superior implementations. But I'm
not yet convince you've found a bug, since your test code is at least mildly
buggy...

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