Article ID: 122649, created on Aug 14, 2014, last review on Sep 10, 2015

  • Applies to:
  • Virtuozzo 6.0

1. What's Included in This Update

This update includes a new Virtuozzo (formerly Parallels Cloud Server) 6.0 kernel (2.6.32-042stab093.4) based on the Red Hat Enterprise Linux 6.5 kernel (2.6.32-431.23.3.el6). The new kernel introduces stability and security fixes.

2. Bug Fixes  

  • Configuring ipset netfilter rules from inside a Container is prohibited as ipset has not been virtualized yet. (#PSBM-27792, OVZ# 2644)  
  • Container online migration could fail with messages like: "Cannot undump the file: Cannot allocate memory Error: do_rst_vma: sc_m(un)lock failed Error: do_rst_mm: failed to restore vma 0x01349000-0x0135a000: -12". This could happen if, inside the Container, a process run by the root user allocated and locked memory, then changed its effective UID. (#PSBM-27938)  
  • Under certain circumstances, online migration of a Container with an IPv6 address could result in a kernel panic in the inet_csk_reqsk_queue_prune() function due to a bug in the IPv6 socket restoration code. (#PSBM-28004)  
  • The inactive memory reclaimer algorithm now does not experience "freezes" up to several seconds long in case there is still plenty of free RAM. (#PSBM-28058)  
  • The number of running processes (nr_running) inside a Container in /proc/stat is now reported for all physical CPUs on the Hardware Node. (#PSBM-28277)  
  • Under certain circumstances, a Hardware Node with several NUMA nodes could end up with a lot of inactive slab objects (e.g., "buffer_head" objects), exceeding the limit for free slab objects. Eventually, these inactive objects could fill up the memory of the entire NUMA zone. (#PSBM-28323)
  • A process could remain in the stopped state (D state) forever after migration of the Container which owned the process from PVCfL 4.0, PVCfL 4.6 or PSBM 4.0 (running 2.6.18-x kernels) to PVCfL 4.7, PSBM 5.0 or PCS 6 (running 2.6.32-x kernels). (#PSBM-28401, OVZ# 3018)  
  • Idle time reported for Containers in /proc/vz/vestat is now calculated correctly. (#PSBM-28403, OVZ# 3035)  
  • Changing socket file's UID/GID could cause the application using this socket to fail after Container online migration. (#PSBM-28424, OVZ# 2969)  

All users are highly advised to install this update.  

3. Obtaining the Update

You can download and install the update using the yum utility included in the Virtuozzo (formerly Parallels Cloud Server) 6.0 distribution.  

4. References

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

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