Article ID: 5880, created on Dec 19, 2008, last review on Apr 18, 2012

  • Applies to:
  • Virtuozzo containers for Linux 4.0

Resolution

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Synopsis:          New Parallels Virtuozzo Containers 4.0 kernel provides a
                   number of important stability fixes.
Issue date:        2008-12-18
Product:           Parallels Virtuozzo Containers 4.0
Keywords:          stability fixes
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This document provides information on the new Parallels Virtuozzo 
Containers 4.0 kernel, version 2.6.18-028stab059.9.

(c) Parallels, 2008. All rights reserved.

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TABLE OF CONTENTS

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

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1. ABOUT THIS RELEASE

The current update for the Parallels Virtuozzo Containers 4.0 kernel provides
a number of important stability fixes.

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2. UPDATES DESCRIPTION

The updated Parallels Virtuozzo Containers 4.0 kernel includes fixes for the
following issues:

  - On certain hardware, a kernel panic may occur when attempting to boot the
    kernel with the "--maxcpus" option.

  - [NFS]: Stopping lockd inside a Container may lead to attempts to stop lockd
    inside other Containers and fail with the following error: "lockd: couldn't
    shut down host module!".

  - [NFS]: When you stop a Container with an NFS volume mounted, the Container
    may wait for the NFS timeout or hang forever if the NFS volume was
    accidentally mounted with the "-o hard" option.

  - Sequential rsh connections from the same source server may fail because the
    requested port on the server is in the TIME_WAIT state and cannot be reused.

  - The "vmlinux" file required for kernel debugging is not included in the SMP
    and Enterprise i686 kernels.

  - The OpenVZ kernel cannot be compiled if IPv6 is disabled in the kernel
    configuration file.

  - [CPT]: The UPD statistics of a Container migrated using the online migration
    mode may be restored incorrectly.

  - [OVZ]: A misprint has been fixed in the pre-uninstall kernel script for the
    i686 Enterprise kernel.

The new Parallels Virtuozzo Containers 4.0 kernel also includes the following
improvements:

  - The Alt+SysRQ+t magic key handler has been enhanced to additionally dump
    calltraces for processes in the running state.

  - The timeout for waiting for a network device to become free has been
    increased from 2.5 to 50 seconds. This should not influence the stopping
    time of Containers, but should provide more correct handling of those
    Container's network devices that are busy during the Container shutdown.

We highly recommend that all Parallels Virtuozzo Containers 4.0 users update
their kernel to the latest version.

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3. BUGS FIXED

The following bugs from the previous release have been fixed in the new
Parallels Virtuozzo Containers 4.0 kernel:

- #126915: Kernel panic occurs when using "--maxcpus" kernel boot option.

- #126918: [NFS]: "lockd: couldn't shut down host module!" on the Container stop.
           [NFS]: A Container stop takes too long if it has a mounted NFS
	   volume inside.

- #128936: SMP and Enterprise i686 kernels do not have vmlinux files.

The following OpenVZ bugs have been fixed:

- #1063: Sequential rsh connections from the same source server fail.

- #1060: OpenVZ kernel compilation without IPv6 is broken.
         [CPT]: UPD6 statistics is dumped twice during online migration.

- #1077: A misprint in the pre-uninstall kernel script for i686 Enterprise
         kernel.

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4. OBTAINING NEW KERNEL

You can download and install the kernel update by 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, you should perform the following operations:

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

# rpm -ivh vzkernel-2.6.18-028stab059.9.i686.rpm \
vzmodules-2.6.18-028stab059.9.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 kind of processor on your Hardware Node, the following RPM
packages are included in the kernel update:

x86 kernels:

- SMP:
   vzkernel-2.6.18-028stab059.9.i686.rpm
   vzmodules-2.6.18-028stab059.9.i686.rpm

- Enterprise:
   vzkernel-ent-2.6.18-028stab059.9.i686.rpm
   vzmodules-ent-2.6.18-028stab059.9.i686.rpm

- Enterprise with the 4GB split feature disabled:
   vzkernel-PAE-2.6.18-028stab059.9.i686.rpm
   vzmodules-PAE-2.6.18-028stab059.9.i686.rpm


x86_64 kernels:

- SMP:
   vzkernel-2.6.18-028stab059.9.x86_64.rpm
   vzmodules-2.6.18-028stab059.9.x86_64.rpm

ia64 kernel:
   vzkernel-2.6.18-028stab059.9.ia64.rpm
   vzmodules-2.6.18-028stab059.9.ia64.rpm

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