RHBA-2015:1279 - Bug Fix Advisory

Topic

Updated irqbalance packages that fix several bugs and add various enhancements
are now available for Red Hat Enterprise Linux 6.

Description

The irqbalance packages provide a daemon that evenly distributes the interrupt
request (IRQ) load across multiple CPUs for enhanced performance.

The irqbalance packages have been upgraded to upstream version 1.0.7, which
provides a number of bug fixes and enhancements over the previous version.
Notably, irqbalance now works with Xen PV guest, broken deepest cache backport
has been fixed, and the IRQ migration algorithm has been enhanced. (BZ#1181720)

This update also fixes the following bugs:

• Previously, the irqbalance utility did not set signal handlers for particular

signals. Consequently, when irqbalance received a signal other than SIGINT or
SIGHUP, it terminated without a cleanup. This update provides signal handlers
for SIGUSR1, SIGUSR2, and SIGTERM. As a result, irqbalance now stops gracefully
after finishing the current balancing iteration. (BZ#1158932)

• Prior to this update, the /sys/bus/pci/devices file handle was not freed

properly if the directory was not available. As a consequence, a memory leak
occurred. With this update, the file handle is freed as expected when irqbalance
cannot open the directory, and memory leaks no longer occur in the described
situation. (BZ#1178247)

Users of irqbalance are advised to upgrade to these updated packages, which fix
these bugs and add these enhancements.

Solution

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

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386

Fixes

• BZ - 1152188 - Irqbalance didn't log failing to set SMP affinity
• BZ - 1158932 - irqbalance signal handling
• BZ - 1162247 - irqbalance wrong hostname in man page
• BZ - 1178247 - irqbalance memory leak
• BZ - 1178903 - irqbalance typo in help message
• BZ - 1181720 - Rebase irqbalance to version 1.0.7

CVEs

(none)

References

(none)