RHBA-2012:0342 - Bug Fix Advisory

Topic

Updated libvirt packages that fix four bugs are now available for Red Hat
Enterprise Linux 6.

Description

The libvirt library is a C API for managing and interacting with the
virtualization capabilities of Linux and other operating systems. In addition,
libvirt provides tools for remote management of virtualized systems.

This update fixes the following bugs:

• Under certain circumstances, a rare race condition between the poll() event

handler and the dmidecode utility could occur. This race could result in
dmidecode waiting indefinitely to perform a read operation on the already closed
file descriptor. As a consequence, it was impossible to perform any tasks for
virtualized guests using the libvirtd management daemon, or perform certain
tasks using the virt-manager utility, such as creating a new virtual machine.
This update modifies the underlying code so that the race condition no longer
occurs and libvirtd and virt-manager work as expected. (BZ#783453)

• Previously, when libvirt tried to attach certain SR-IOV (Single Root I/O

Virtualization) devices to virtual guests, this attempts failed with the "Unable
to reset PCI device" error messages. This patch modifies the underlying code so
that these PCI devices can now be successfully attached to guests. (BZ#784785)

• When migrating a QEMU domain and using SPICE for a remote display, the

migration was failing and the display was erratic under certain circumstances.
This was happening because with the incoming migration connection open, QEMU was
unable to accept any other connections on the target host. With this update, the
underlying code has been modified to delay the migration connection until the
SPICE client is connected to the target destination. The guest domains can now
be successfully migrated without disrupting the display during the migration.
(BZ#787620)

• Previously, if the libvirt package was built with avahi support, libvirt

required the avahi package to be installed on the system as a prerequisite for
its own installation. If the avahi package could not be installed on the system
due to security concerns, installation of libvirt failed. This update modifies
the libvirt.spec file to require only the avahi-libs package. The libvirt
package is now successfully installed and libvirtd starts as expected.
(BZ#790779)

All users of libvirt are advised to upgrade to these updated packages, which fix
these bugs. After installing these updated packages, libvirtd must be restarted.
Use the "service libvirtd restart" command for this update to take effect.

Solution

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
https://access.redhat.com/kb/docs/DOC-11259

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.2 i386
• 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 IBM z Systems 6 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 6.2 s390x
• 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 Update Support from RHUI 6.2 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.2 i386
• Red Hat Storage 2.0 x86_64
• Red Hat Gluster Storage Server for On-premise 2.0 x86_64
• Red Hat Storage for Public Cloud (via RHUI) 2.0 x86_64
• Red Hat Enterprise Linux Server - AUS 6.2 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.2 ppc64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• 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
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

• BZ - 790779 - Make avahi failure on startup non-fatal

CVEs

(none)

References

(none)