Article ID: 114656, created on Aug 27, 2012, last review on Apr 30, 2014

  • Applies to:
  • Virtuozzo containers for Linux 4.7
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Synopsis:          New Parallels Virtuozzo Containers 4.7 kernel provides
                   an update with security and stability fixes.
Product:           Parallels Virtuozzo Containers 4.7
Keywords:          "bugfix" "stability" "security"

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This document provides information on the new Parallels Virtuozzo Containers (PVC) 4.7 kernel, version 2.6.32-042stab061.2.

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TABLE OF CONTENTS

1. About This Release
2. Updates Description
3. Obtaining New Kernel
4. Installing New Kernel
5. Required RPMs
6. References

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1. ABOUT THIS RELEASE

The current update for the Parallels Virtuozzo Containers 4.7 kernel provides a new
kernel based on the Red Hat Enterprise Linux 6.3 kernel (2.6.32-279.5.1.el6).
The updated kernel includes a number of security and stability fixes.

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2. UPDATES DESCRIPTION

This update contains fixes for the following issues:

* Kernel warnings such as "WARNING: at kernel/sched_rt.c:13 pick_next_highest_task_rt"
  have been eliminated. (PCLIN-31148)

* The checkpointing code has been enhanced to keep futex timeouts bound to
  a container's virtualized monotonic time. This ensures proper futex timeout
  values after online migration of a container. (PSBM-14471)

* Sometimes, the "pppd" daemon running in a container would hang, and
  it would be impossible to stop such a container. (PCLIN-31160)

* The "notify_on_release" and "release_agent" cgroups features did not work
  on the Hardware Node. (OVZ 2261)

* If disabled with the "ip_conntrack_disable_ve0=1" nf_conntrack kernel module
  option, ip_conntrack functionality could not be enabled again by removing
  this option until the Node was rebooted. (PCLIN-31123)

* Network devices can now be unregistered and destroyed in parallel. This
  decreases the overall time required to stop multiple containers. (PSBM-11724)

* JAVA processes could hang when running in containers that had the CPUS
  parameter set to 1. This happened because JAVA tried to optimize its code
  on uniprocessor (UP) systems, while containers were not guaranteed to be
  uniprocessor systems, even if their CPUS parameter was set to 1.
  The issue was resolved by creating empty /sys/devices/system/cpu# directories
  for each possible CPU (+1 on UP systems).

  Effectively, this makes glibc think that the _SC_NPROCESSORS_CONF value is always more
  than 1, so userspace applications are not tempted to "optimize" their
  code. This also helps avoid possible problems with the online migration of
  containers between UP and SMP systems. (PSBM-14103, OVZ 2206)

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3. OBTAINING NEW KERNEL

You can download and install this kernel update using the vzup2date utility
included in the Parallels Virtuozzo Containers 4.7 distribution set.

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4. INSTALLING NEW KERNEL

To install the update, do the following:

I. Use the "rpm -ihv" command to install the new kernel and PVC modules.

# rpm -ivh vzkernel-2.6.32-042stab061.2.i686.rpm \
vzmodules-2.6.32-042stab061.2.i686.rpm
Preparing...                ################################# [100%]
    1:vzkernel               ################################# [50%]
    2:vzmodules              ################################# [100%]

    Please DO NOT USE the "rpm -Uhv" command to install the kernel. Otherwise,
    all the kernels that were previously installed on your system may be removed from
    the Hardware Node.

II. You can adjust your boot loader configuration file to have the new kernel
    loaded by default. If you use the LILO bootloader, please do not forget to
    execute the "lilo" command to write the changes to the boot sector:

     # lilo
     Added Virtuozzo2 *
     Added Virtuozzo1
     Added linux
     Added linux-up

III. Reboot your computer with the "shutdown -r now" command to boot the new
     kernel.

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5. REQUIRED RPMS

Depending on the processor installed on the Hardware Node, the following RPM
packages are included in the kernel update:

x86 kernels:

- SMP:
   vzkernel-2.6.32-042stab061.2.i686.rpm
   vzmodules-2.6.32-042stab061.2.i686.rpm

- Enterprise:
   vzkernel-ent-2.6.32-042stab061.2.i686.rpm
   vzmodules-ent-2.6.32-042stab061.2.i686.rpm

- Enterprise with the 4GB split feature disabled:
   vzkernel-PAE-2.6.32-042stab061.2.i686.rpm
   vzmodules-PAE-2.6.32-042stab061.2.i686.rpm


x86_64 kernels:

- SMP:
   vzkernel-2.6.32-042stab061.2.x86_64.rpm
   vzmodules-2.6.32-042stab061.2.x86_64.rpm

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6. REFERENCES

http://rhn.redhat.com/errata/RHSA-2012-1156.html
https://www.redhat.com/security/data/cve/CVE-2011-1078.html
https://www.redhat.com/security/data/cve/CVE-2012-2383.html

http://rhn.redhat.com/errata/RHBA-2012-1104.html

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Copyright (c) 1999-2012 Parallels Holdings, Ltd. and its affiliates. All rights
reserved.

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