[Bug nptl/12403] futex issues with --enable-kernel=2.6.22 to 2.6.28

["bz-glibc at kdzbn dot homelinux.net" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12403

Bryan Kadzban <bz-glibc at kdzbn dot homelinux.net> changed:

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--- Comment #5 from Bryan Kadzban <bz-glibc at kdzbn dot homelinux.net> 2011-01-23 22:38:12 UTC ---
I'm seeing this as well.  I've tracked it down to a bug in the cleanup code in
pthread_rwlock_timedwrlock.S (causing a stack imbalance just before "retq") --
it uses __ASSUME_PRIVATE_FUTEX when deciding whether or not to clean up after
the local variables (and saved register) created for
__ASSUME_FUTEX_CLOCK_REALTIME.  When these two are set differently, "retq"
jumps off into never-never-land.

There's a related bug in pthread_rwlock_timedrdlock.S, which emits the wrong
CFI directives, but I don't think this will affect runtime.  (Could be wrong
though; I don't know a lot about CFI.)

Attached is a patch that fixes both issues; with this, all crashing in the
testsuite is gone.

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