RHBA-2013:0756 - Bug Fix Advisory

Topic

Updated libvirt packages that fix several 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:

• Previously, due to several issues, IPv6 was not handled properly during

migration. With this update, migrations now succeed in the described scenario.
(BZ#950597)

• Due to a race condition in the libvirt client library, any application using

libvirt could terminate unexpectedly with a segmentation fault. This happened
when one thread executed the connection close callback, while another one freed
the connection object, and the connection callback thread then accessed memory
that had been already freed. This update fixes the possibility of freeing the
callback data when they are still being accessed. (BZ#950599)

• Due to a race condition in the client side of libvirt's RPC implementation, a

client connection that was closed by the server could have been freed, even
though other threads were still waiting for APIs sent through this connection to
finish. As a result, the other threads could have accessed memory that was
already freed and the client terminated unexpectedly with a segmentation fault.
With this update the connection is freed only after all threads process their
API calls and report errors to their callers. (BZ#950601)

• Previously, attempts to clone a storage volume not in RAW format from a

directory pool, file system pool, or NFS pool, to a LVM pool, using the "virsh
vol-create-from" command, failed with an "unknown file format" error message.
This update fixes this bug by treating output block devices as RAW file format
and storage volumes can now be cloned as expected. (BZ#950604)

• Under certain conditions, when a connection was closed, guests set to be

automatically destroyed failed to be destroyed and the libvirtd daemon
terminated unexpectedly. A series of patches addressing various crash scenarios
has been provided and libvirtd no longer crashes while auto-destroying guests.
(BZ#951073)

• When running the libvirt test suite on a machine under heavy load, the test

could end up in a deadlock. Since the test suite was run during RPM build, the
build never finished if the deadlock happened. This update fixes the handling of
an event loop used in the test suite, and the test suite no longer hangs in the
described scenario. (BZ#951235)

Users of libvirt are advised to upgrade to these updated packages, which fix
these bugs. After installing the updated packages, libvirtd will be restarted
automatically.

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/knowledge/articles/11258

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 6.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.4 i386
• Red Hat Enterprise Linux Server - AUS 6.4 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 6.4 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.4 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 Virtualization 3 for RHEL 6 x86_64
• Red Hat Gluster Storage Server for On-premise 2.1 x86_64
• 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 Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.4 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.4 i386
• Red Hat Storage for Public Cloud (via RHUI) 2.1 x86_64
• 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 - 950597 - Support migration with IPv6 addresses
• BZ - 950599 - [abrt] libvirt-client-0.10.2-18.el6: remoteClientCloseFunc: Process /usr/bin/virsh was killed by signal 11 (SIGSEGV)
• BZ - 951073 - libvirtd crash on race with auto-destroy guests
• BZ - 951235 - race in libvirt testsuite could prevent a successful rpm build

CVEs

(none)

References

(none)