Article ID: 120513, created on Mar 12, 2014, last review on May 8, 2014

  • Applies to:
  • Virtuozzo hypervisor 5.0
Synopsis:          A new Parallels Server Bare Metal 5.0 kernel update
                   addressing security, performance, and stability
Product:           Parallels Server Bare Metal 5.0
Keywords:          'bugfix' 'stability' 'security'


This document provides information on the new Parallels Server Bare
Metal 5.0 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 Server Bare Metal 5.0 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 vzup2date
utility included in the Parallels Server Bare Metal 5.0 distribution



Copyright (c) 1999-2014 Parallels IP Holdings GmbH and its affiliates. All
rights reserved.

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