RHBA-2012:0398 - Bug Fix Advisory

Topic

Updated kvm packages that fix one bug are now available for Red Hat Enterprise
Linux 5.

Description

[Updated 16 May 2012]
This advisory has been updated with the correct description for bug 802429. The
packages included in this revised update have not been changed in any way from
the packages included in the original advisory.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux
on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for the
standard Red Hat Enterprise Linux kernel.

This update fixes the following bug:

• An accounting error in the I/O thread subsystem in QEMU could, under certain

circumstances, lead to I/O stalls on the guest. This would typically cause the
guest to become unresponsive. With this update, the accounting error has been
corrected, and I/O stalls no longer occur in this scenario. (BZ#802429)

All users of kvm are advised to upgrade to these updated packages, which fix
this bug. Note that the procedure in the Solution section must be performed
before this update will take effect.

Solution

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

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

The following procedure must be performed before this update will take
effect:

1) Stop all KVM guest virtual machines.

2) Either reboot the hypervisor machine or, as the root user, remove (using
"modprobe -r [module]") and reload (using "modprobe [module]") all of the
following modules which are currently running (determined using "lsmod"):
kvm, ksm, kvm-intel or kvm-amd.

3) Restart the KVM guest virtual machines.

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Workstation 5 x86_64

Fixes

CVEs

(none)

References

(none)