Article ID: 11248, created on Apr 7, 2011, last review on May 4, 2014

  • Applies to:
  • Virtuozzo containers for Linux 4.0

Release notes


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Synopsis:          New Parallels Virtuozzo Containers 4.0 kernel provides
                   performance improvements and security and stability fixes
                   from Red Hat and Parallels.
Issue date:        2011-04-08
Product:           Parallels Virtuozzo Containers 4.0
Keywords:          'security' 'bugfix' 'stability' 'performance'

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This document provides information on the new Parallels Virtuozzo Containers 4.0
kernel, version 2.6.18-028stab085.3.

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TABLE OF CONTENTS

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

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1. ABOUT THIS RELEASE

The current update for the Parallels Virtuozzo Containers 4.0 kernel provides a
new kernel based on the Red Hat 5.6 kernel (2.6.18-238.5.1.el5). The updated
kernel includes a set of performance improvements and a number of security and
stability fixes.

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2. UPDATES DESCRIPTION

This update contains fixes for the following issues:

* Creating a cache for the x86 version of the Ubuntu 10.10 EZ template may fail.

* The iotop utility does not work in Containers running Ubuntu 10.10 and
  Fedora 13.

* Sometimes, the shmpages resource may uncharge too many pages.

* The /proc/bc/<id>/meminfo file needs to be added to the /proc system.

* An inotify/inode mutex deadlock may occur in Containers running KDE 4.1.3 or
  4.2.

* Some files may get lost after migrating Containers with NFS shares mounted.

* Running the bonnie++ application simultaneously in several Containers and
  setting the I/O limit for these Containers later may lead to the termination
  of bonnie++ and the inability to stop the affected Containers.

* IPv6 Path MTU does not work after the route timeout. (OpenVZ bug #1675)

* Core dumps for a Container migrated using the online migration type are
  generated in a wrong format. (PCLIN-28661)

* Unmounting a bindmount may get stuck after migrating a Container using the
  online migration type.

* Offline management over the IPv6 protocol does not work in Containers.
  (PCLIN-28716)

* A kernel crash may occur when reading nfsd statistics from /proc.
  (PCLIN-28760)

* The ps utility does not work in 32-bit Containers when many Containers are
  running simultaneously. (PSBM-6437)

* Moving a bridge device inside a Container may cause the system crash or hang.
  (PSBM-6023)

* Unix socket permissions may get lost during online migration. (PCLIN-28774)

* An unkillable process may be created during online migration. (PSBM-6649)

* The system may fail to bring up a network interface due to a bug in permission
  checking. (ovz #1716)

* A kernel panic may occur on a system running the NFSv4 client. (ovz #1583)

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3. KNOWN ISSUES

gettimeofday() might work incorrectly on systems that use the PM timer. This may
affect your system in different ways, for example:
- In some applications, time may go backward, causing segmentation faults.
- "top" might show very high load average values.
- JAVA processes may hang.

To work around this problems, set the "vdso=0" kernel option.

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4. OBTAINING NEW KERNEL

You can download and install this kernel update using the vzup2date utility
included in the Parallels Virtuozzo Containers 4.0 distribution set.

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5. INSTALLING NEW KERNEL

To install the update, do the following:

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

# rpm -ivh vzkernel-2.6.18-028stab085.3.i686.rpm \
vzmodules-2.6.18-028stab085.3.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 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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6. 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-2.6.18-028stab085.3.i686.rpm
   vzmodules-2.6.18-028stab085.3.i686.rpm

- Enterprise:
   vzkernel-ent-2.6.18-028stab085.3.i686.rpm
   vzmodules-ent-2.6.18-028stab085.3.i686.rpm

- Enterprise with the 4GB split feature disabled:
   vzkernel-PAE-2.6.18-028stab085.3.i686.rpm
   vzmodules-PAE-2.6.18-028stab085.3.i686.rpm


x86_64 kernels:

- SMP:
   vzkernel-2.6.18-028stab085.3.x86_64.rpm
   vzmodules-2.6.18-028stab085.3.x86_64.rpm

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7. REFERENCES

https://rhn.redhat.com/errata/RHSA-2011-0004.html
https://rhn.redhat.com/errata/RHSA-2011-0017.html
https://rhn.redhat.com/errata/RHSA-2011-0163.html
https://rhn.redhat.com/errata/RHSA-2011-0303.html

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Copyright (c) 1999-2011 Parallels Holdings, Ltd. and its affiliates. All rights
reserved.

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