An updated libX11 package that fixes a bug is now available for Red Hat Enterprise Linux 5.
The libX11 package contains the core X11 protocol client library.
Previously, in the 64-bit mode, libX11 computed addresses using the 32-bit arithmetic. As a consequence, under heavy load, applications running in the X environment terminated unexpectedly. A patch has been provided to address this issue, and the crashes no longer occur in the described scenario.
Users of libX11 are advised to upgrade to this updated package, which fixes this bug.