B.38.11. RHBA-2011:1412 — kernel bug fix update

Updated kernel packages that fix one bug are now available for Red Hat Enterprise Linux 6 Extended Update Support.
The kernel packages contain the Linux kernel, the core of any Linux operating system.
Bug Fix
While executing a multi-threaded process by multiple CPUs, page-directory-pointer-table entry (PDPTE) registers were not fully flushed from the CPU cache when a Page Global Directory (PGD) entry was changed in x86 Physical Address Extension (PAE) mode. As a consequence, the process failed to respond for a long time before it successfully finished. With this update, the kernel has been modified to flush the Translation Lookaside Buffer (TLB) for each CPU using a page table that has changed. Multi-threaded processes now finish without hanging.
All users of kernel are advised to upgrade to these updated packages, which fix this bug. The system must be rebooted for this update to take effect.