IT32630: MQ appliance reports high memory usage due to memory leak in corosync process

APAR status

• Closed as program error.

Error description

• The ps output captured by runmqras shows lot of memory consumed
  by corosync process.
  
  Example excerpt from "ps -eo" output:
  
   24850    1  2 S 64702492 32.5 1.5  Feb 09 13:04:46 root  root
   root   root   corosync
  
  This ps output indicates corosync process consumed around 64 GB
  memory.
  

Local fix

• Reboot the appliance.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users of MQ appliance with QMs configured High in Availability
  likely to see
  high memory usage on the HA appliance where the QMs are running
  as standby
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  The memory leak occurred because of defects in corosync and
  pacemaker components used
  for High Availability in MQ appliance.
  

Problem conclusion

• MQ appliance corosync and pacemaker components have been updated
  to higher version to fix the memory leak.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.1 CD    TBC.
  v9.1 LTS   9.1.0.6
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  MQ APPLIANCE M2

• Fixed component ID

  5737H4700

Applicable component levels