Parallels

Resolution

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Synopsis: New Parallels Virtuozzo Containers 4.0 kernel provides
several important NFS-related stability fixes.
Issue date: 2008-08-07
Product: Parallels Virtuozzo Containers 4.0
Keywords: NFS stability fixes
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This document provides information on the new Virtuozzo Containers 4.0 kernel,
version 2.6.18-028stab057.4.

(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 Virtuozzo Containers 4.0 kernel provides a new kernel
with a number of important NFS-related stability fixes.

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2. UPDATES DESCRIPTION

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

- A kernel crash could occur if a process inside a Container accessed data
located on an NFS submount in case the NFS server was configured with the
"nohide" option.

- A Container stop command could freeze NFS I/O operations if an NFS share
mounted inside the Container was unmounted from the host system.
The "lockd" usage counter leakage that happened in this case was
accompanied with the following messages:
"lockd_down: no users! pid=0"
"lockd_down: no lockd running".


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
Virtuozzo Containers 4.0 kernel:

- #117783: [NFS]: NFS superblock should be cloned while passing a submount.

- #117687: [NFS]: wrong context during NFS umount operation.

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4. OBTAINING NEW KERNEL

You can get this kernel update in one of the following ways:

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

- You can download the update from ftp://downloads.swsoft.com.

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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-2.6.18-028stab057.4.i686.rpm \
vzmodules-2.6.18-028stab057.4.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-2.6.18-028stab057.4.i686.rpm
vzmodules-2.6.18-028stab057.4.i686.rpm

- Enterprise:
vzkernel-ent-2.6.18-028stab057.4.i686.rpm
vzmodules-ent-2.6.18-028stab057.4.i686.rpm

- Enterprise with the 4GB split feature disabled:
vzkernel-PAE-2.6.18-028stab057.4.i686.rpm
vzmodules-PAE-2.6.18-028stab057.4.i686.rpm


x86_64 kernels:

- SMP:
vzkernel-2.6.18-028stab057.4.x86_64.rpm
vzmodules-2.6.18-028stab057.4.x86_64.rpm

ia64 kernel:
vzkernel-2.6.18-028stab057.4.ia64.rpm
vzmodules-2.6.18-028stab057.4.ia64.rpm