Article ID: 120509, created on Mar 12, 2014, last review on May 1, 2014

  • Applies to:
  • Virtuozzo 6.0
Synopsis:          A new Parallels Cloud Server 6.0 kernel update
addressing security, performance, and stability issues.

Issue date:        2014-03-12
Product:  Parallels Cloud Server 6.0
Keywords:          'bugfix' 'stability' 'security'
This document provides information on the new Parallels Cloud Server 6.0
kernel, version 2.6.32-042stab085.17.
1. About This Update
2. Update Description
3. Obtaining the New Kernel
4. References
The current update for the Parallels Cloud Server 6.0 kernel provides a
new kernel based on the Red Hat Enterprise Linux 6.5 kernel
(2.6.32-431.1.2.el6).  The updated kernel includes a number of security,
performance, and stability fixes.
This update includes the following fixes and improvements:
* The OOMGUARPAGES failcounter sometimes may not be updated in case the
OOM  killer enters the "berserker" mode. (PCLIN-32154)
* Under certain circumstances, the network may be flooded by UDP unicast
  packets amplified by Containers working in the "bridged" mode.
* The UID/GID of UNIX sockets created on tmpfs filesystem could be
restored  incorrectly after online Container migration which could cause
  application failures. (PSBM-25014)
* Under certain conditions, file checksums can be calculated
incorrectly,  causing pfcache to malfunction. (PSBM-23774)
* An online migration of a long-living ploop-based Container could lead
to a  kernel panic on the destination Node caused by improper ploop version
  detection. (PSBM-24408)
* Previously, a process inside a Container which tried to allocate more
than  half of RAM provided to that Container was usually killed by the
  SIGBUS signal. This behavior was correct but not user-friendly enough.
  The improved algorihtm checks the amount of free shared memory in
  advance and returns -ENOSPC to the requester instead. (PSBM-23408,
  OVZ# 2805)
* Client cannot connect to Parallels Power Panel on port 4643 with a
  lower-than-1500-MTU router. Such connections hang. (PSBM-24217)
* Under certain conditions, the Container backup and online migration
  operations could cause a kernel panic in the ext4 code in case /vz was
  mounted without journal. (PCLIN-32263)
You can download and install this kernel update using the yum utility
included in the Parallels Cloud Server 6.0 distribution set.
Copyright (c) 1999-2014 Parallels IP Holdings GmbH and its affiliates.
All rights reserved.

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