IT44106: High CPU usage in MQ appliance when or after using dspmqerr command

APAR status

• Closed as program error.

Error description

• When using the dspmqerr command to review the queue manager logs
  or other support, it has been
  observed that sometimes the session continues running in the
  background, leading to high CPU usage.
  
  This issue can be identified by observing a higher CPU usage
  than usual in the output of the status command, as shown below:
  
  mqa(mqcli)# status
  Memory:                                  187.8GB total, 20683MB
  used [11%]
  CPU:                                     54%
  CPU load:                                7.32, 6.95, 6.75
  ...
  
  Upon reviewing the ps output captured by runmqras report, it was
  discovered one or more "less" processes, internally used by the
  dspmqerr command, were consuming high CPU.
  
  Example:
  
    18939       1    1 R   6732  0.0 97.0   Apr 11 77-15:04:43
     mqsystem mqm   mqsystem mqm      less
  /var/mqm/vols/QM1/qmgr/QM1/errors/AMQERR01.LOG
  364614       1    1 R   6732  0.0 98.5   May 17 42-18:32:48
  mqsystem mqm   mqsystem mqm      less
  /var/mqm/vols/QM2/qmgr/QM2/errors/AMQERR01.LOG
  

Local fix

• Contact IBM Support to provide instructions on how to remove
  the orphaned processes.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users using dspmqerr command to view logs(e.g. queue manager
  logs) in MQ appliance
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  This problem was due to orphaned processes internally used by
  the dspmqerr command.
  

Problem conclusion

• MQ code has been modified to end the orphaned processes to
  resolve the high CPU issue.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.3 LTS   9.3.0.20
  v9.4 LTS   9.4.0.0
  
  The latest available maintenance can be obtained from
  'IBM MQ Recommended Fixes'
  https://www.ibm.com/support/pages/recommended-fixes-ibm-mq
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'IBM MQ
  Planned Maintenance Release Dates'
  https://ibm.biz/mqplannedmaintenance
  
  ---------------------------------------------------------------
  

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 APPL M2002

• Fixed component ID

  5737H4701

Applicable component levels