Synopsis

tuned bug fix update

Type/Severity

Bug Fix Advisory

Topic

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

Description

The tuned packages contain a daemon that tunes system settings dynamically. It
does so by monitoring the usage of several system components periodically.

This update fixes the following bugs:

• Red Hat Enterprise Linux 6.1 and later enters processor power-saving states
  more aggressively. This could result in a small performance penalty on certain
  workloads. With this update, the pmqos-static.py daemon has been added to the
  tuned packages, which allows to set the requested latency using the kernel Power
  Management QoS interface. It is run when the "latency-performance" profile is
  activated and it sets cpu_dma_latency=0, which keeps the CPU in C0 state, thus
  making the system as responsive as possible. (BZ#714180)
  
• When the ELEVATOR_TUNE_DEVS option was set to a disk device in the
  /etc/sysconfig/ktune file instead of providing a disk scheduler control file,
  the scheduler setting was not written to a disk scheduler control file but
  directly into the disk device file. Consequently, contents of the disk could
  become corrupted. With this update, the value of ELEVATOR_TUNE_DEVS is checked
  and only the disk scheduler control file is allowed for writing. As a result, an
  invalid value of ELEVATOR_TUNE_DEVS is detected in the described scenario so
  that the disk contents damage can be prevented. (BZ#784308)
  
• When the tuned daemon run with the "enterprise-storage" profile enabled and a
  non-root, non-boot disk partition from a device with write-back cache was
  mounted, tuned remounted the partition with the "nobarriers" option. If a power
  failure occurred at that time, the file system could become corrupted. With this
  update, tuned can detect usage of write-back cache on devices communicating with
  kernel via SCSI. In these cases, "nobarriers" is now disabled, thus preventing
  this bug in the described scenario. (BZ#801561)
  
• Previously, when the tuned service was started, the tuned PID file was created
  with world-writable permissions. This bug has been fixed and the
  /var/run/tuned/tuned.pid file is now created with correct permissions as
  expected. (BZ#845336)
  
• On a machine with hot-plug disk devices with the "enterprise-storage" profile
  activated, a new disk device could be added into the system, or the disk could
  be removed and inserted back. In such a scenario, the scheduler and read-ahead
  settings from the profile were not applied on the newly-added disks. With this
  update, a new udev rule has been added, which restarts the ktune daemon whenever
  a new disk device is added, thus fixing this bug. (BZ#847445)
  
• The transparent hugepage kernel thread could interfere with latency-sensitive
  applications. To lower the latency, the transparent hugepages are now disabled
  in the latency-performance tuned profile. (BZ#887355)
  
• Previously, non-root, non-boot partitions were re-mounted using the
  "nobarrier" option to improve performance. On virtual guests, this could lead to
  data corruption if power supply was suddenly interrupted, because there was
  usually a host cache in transfer. This bug has been fixed and the virtual-guest
  profile no longer re-mounts partitions using "nobarrier". (BZ#886956)
  

Users of tuned 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/knowledge/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 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 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

Fixes

• BZ - 784308 - ktune breaks disks when pecifying just the device (e. g. /dev/sda) for ELEVATOR_TUNE_DEVS
• BZ - 801561 - tuned-adm enterprise-storage should not disable barriers on devices with write back cache
• BZ - 845336 - /var/run/tuned/tuned.pid created with insecure permissions
• BZ - 887355 - disable transparent hugepages in latency-performance profile

CVEs

• CVE-2012-6136

References

(none)

Red Hat Enterprise Linux Server 6

SRPM
tuned-0.2.19-11.el6.src.rpm	SHA-256: 9f55f3faf10a4cb8489ad454bc7036fd655b37df060fd2a76193ff7b2655f056
x86_64
tuned-0.2.19-11.el6.noarch.rpm	SHA-256: 38bd3ec0a29622667f743f49ed41f86cbb8f79a2ce2a1e16f855d89883897bfd
tuned-utils-0.2.19-11.el6.noarch.rpm	SHA-256: 628ca880febc6e3207398735a953fef43f2662781e0237fbbab1429a7a4afce2
i386
tuned-0.2.19-11.el6.noarch.rpm	SHA-256: 38bd3ec0a29622667f743f49ed41f86cbb8f79a2ce2a1e16f855d89883897bfd
tuned-utils-0.2.19-11.el6.noarch.rpm	SHA-256: 628ca880febc6e3207398735a953fef43f2662781e0237fbbab1429a7a4afce2

Red Hat Enterprise Linux Workstation 6

SRPM
tuned-0.2.19-11.el6.src.rpm	SHA-256: 9f55f3faf10a4cb8489ad454bc7036fd655b37df060fd2a76193ff7b2655f056
x86_64
tuned-0.2.19-11.el6.noarch.rpm	SHA-256: 38bd3ec0a29622667f743f49ed41f86cbb8f79a2ce2a1e16f855d89883897bfd
tuned-utils-0.2.19-11.el6.noarch.rpm	SHA-256: 628ca880febc6e3207398735a953fef43f2662781e0237fbbab1429a7a4afce2
i386
tuned-0.2.19-11.el6.noarch.rpm	SHA-256: 38bd3ec0a29622667f743f49ed41f86cbb8f79a2ce2a1e16f855d89883897bfd
tuned-utils-0.2.19-11.el6.noarch.rpm	SHA-256: 628ca880febc6e3207398735a953fef43f2662781e0237fbbab1429a7a4afce2

Red Hat Enterprise Linux Desktop 6

SRPM
tuned-0.2.19-11.el6.src.rpm	SHA-256: 9f55f3faf10a4cb8489ad454bc7036fd655b37df060fd2a76193ff7b2655f056
x86_64
tuned-0.2.19-11.el6.noarch.rpm	SHA-256: 38bd3ec0a29622667f743f49ed41f86cbb8f79a2ce2a1e16f855d89883897bfd
tuned-utils-0.2.19-11.el6.noarch.rpm	SHA-256: 628ca880febc6e3207398735a953fef43f2662781e0237fbbab1429a7a4afce2
i386
tuned-0.2.19-11.el6.noarch.rpm	SHA-256: 38bd3ec0a29622667f743f49ed41f86cbb8f79a2ce2a1e16f855d89883897bfd
tuned-utils-0.2.19-11.el6.noarch.rpm	SHA-256: 628ca880febc6e3207398735a953fef43f2662781e0237fbbab1429a7a4afce2

Red Hat Enterprise Linux for IBM z Systems 6

SRPM
tuned-0.2.19-11.el6.src.rpm	SHA-256: 9f55f3faf10a4cb8489ad454bc7036fd655b37df060fd2a76193ff7b2655f056
s390x
tuned-0.2.19-11.el6.noarch.rpm	SHA-256: 38bd3ec0a29622667f743f49ed41f86cbb8f79a2ce2a1e16f855d89883897bfd
tuned-utils-0.2.19-11.el6.noarch.rpm	SHA-256: 628ca880febc6e3207398735a953fef43f2662781e0237fbbab1429a7a4afce2

Red Hat Enterprise Linux for Power, big endian 6

SRPM
tuned-0.2.19-11.el6.src.rpm	SHA-256: 9f55f3faf10a4cb8489ad454bc7036fd655b37df060fd2a76193ff7b2655f056
ppc64
tuned-0.2.19-11.el6.noarch.rpm	SHA-256: 38bd3ec0a29622667f743f49ed41f86cbb8f79a2ce2a1e16f855d89883897bfd
tuned-utils-0.2.19-11.el6.noarch.rpm	SHA-256: 628ca880febc6e3207398735a953fef43f2662781e0237fbbab1429a7a4afce2

Red Hat Enterprise Linux for Scientific Computing 6

SRPM
tuned-0.2.19-11.el6.src.rpm	SHA-256: 9f55f3faf10a4cb8489ad454bc7036fd655b37df060fd2a76193ff7b2655f056
x86_64
tuned-0.2.19-11.el6.noarch.rpm	SHA-256: 38bd3ec0a29622667f743f49ed41f86cbb8f79a2ce2a1e16f855d89883897bfd
tuned-utils-0.2.19-11.el6.noarch.rpm	SHA-256: 628ca880febc6e3207398735a953fef43f2662781e0237fbbab1429a7a4afce2

Red Hat Enterprise Linux Server from RHUI 6

SRPM
tuned-0.2.19-11.el6.src.rpm	SHA-256: 9f55f3faf10a4cb8489ad454bc7036fd655b37df060fd2a76193ff7b2655f056
x86_64
tuned-0.2.19-11.el6.noarch.rpm	SHA-256: 38bd3ec0a29622667f743f49ed41f86cbb8f79a2ce2a1e16f855d89883897bfd
tuned-utils-0.2.19-11.el6.noarch.rpm	SHA-256: 628ca880febc6e3207398735a953fef43f2662781e0237fbbab1429a7a4afce2
i386
tuned-0.2.19-11.el6.noarch.rpm	SHA-256: 38bd3ec0a29622667f743f49ed41f86cbb8f79a2ce2a1e16f855d89883897bfd
tuned-utils-0.2.19-11.el6.noarch.rpm	SHA-256: 628ca880febc6e3207398735a953fef43f2662781e0237fbbab1429a7a4afce2