glibc bug fix update

Updated glibc packages that fix three bugs are now available.

The glibc packages contain the standard C libraries used by multiple
programs on the system. These packages contain the standard C and the
standard math libraries. Without these two libraries, the Linux system
cannot function properly.

This update applies the following bug fixes:

* insufficient locking allowed the strerror function to cause segfault
crashes in the gettext subsystem when used in multi-threaded applications.
This update includes backported patches that add the necessary locks to
glibc. (BZ#593290)

* submitting an AIO write request initially requires creating a helper
thread to handle the request. If the creation of this thread fails, a
corruption of glibc internal data structures can result which can cause a
crash when the next AIO request is submitted. This update corrects this by
making sure the internal structures remain consistent and correct.
(BZ#597204)

* in some circumstances, unloading a module could leave the remaining
modules' symbol search list in an inconsistent state. Consequent to this
inconsistency, symbol lookups could spuriously fail to find the symbol.
This update corrects this: module unloading no longer produces inconsistent
state in the symbol search list. (BZ#602210)

All users are advised to upgrade to these updated packages, which resolve
these issues.

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

593290 - segfaults in re-entrant gettext code
597204 - If pthread_create fails in aio_write, requests linked list is corrupted
602210 - [4.8] Unexpected failure of resolving a locally-defined symbol.