RHBA-2013:1750 - Bug Fix Advisory

Topic

Updated qemu-kvm packages that fix several bugs are now available for Red Hat
Enterprise Linux 6.

Description

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux
on AMD64 and Intel 64 systems. qemu-kvm is the user-space component for running
virtual machines using KVM.

This update fixes the following bugs:

• Recent changes to the block layer resulted in a disk I/O performance

degradation due to the way block length is calculated and cached internally.
This update improves the logic for calculating such lengths and restores
performance to the expected levels. (BZ#1025596)

• Due to a regression, the "qemu-img info" command took too much time to respond

with the "cluster_size=512,preallocation=metadata" option. This bug has been
fixed and "qemu-img info" now responds within one second. (BZ#1029327)

• On images created with very small non-standard cluster sizes (for example, 512

bytes), the "qemu-img info" command could take a long time to respond if run
immediately after an image creation. This bug has been fixed, and "qemu-img
info" now works as expected. (BZ#1029327)

• When doing live migration with the "--copy-storage-all" option, the virsh user

interface failed with the following error message:

"error: Unable to read from monitor: Connection reset by peer"

This bug, caused by a regression, has been fixed, and live migration now
finishes successfully. (BZ#1029329)

• Previously, qemu (for example, the "qemu-img info" command) could not open

VMWare ESX image files. A patch fixing this bug has been provided, and ESX
images are now handled correctly. (BZ#1028252)

Users of qemu-kvm are advised to upgrade to these updated packages, which fix
these bugs.

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/site/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 6.5 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.5 i386
• Red Hat Enterprise Linux Server - AUS 6.5 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• 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 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 6 x86_64
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Server - TUS 6.5 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.5 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.5 i386
• Red Hat Enterprise Linux EUS Compute Node 6.5 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

Fixes

• BZ - 1025596 - Read/Randread/Randrw performance regression
• BZ - 1029327 - 'qemu-img info' take too much time with 'cluster_size=512,preallocation=metadata' in the first time

CVEs

(none)

References

(none)