IT19750: MQ 7.5 QUEUE MANAGER BLOCKS DURING SHUTDOWN, AMQFQPUB PROCESS APPEARS HUNG

APAR status

• Closed as program error.

Error description

• When performing a quiesce shutdown, the queue manager does not
  end.
  A failure data capture (FDC) record reporting
  xecL_W_LONG_LOCK_WAIT is seen for the amqfqpub process.
  This issue is only seen when stopping the queue manager
  immediately after it has started.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users of WebSphere MQ V7.5.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A small timing window existed during the shutdown process which
  could cause a deadlock which meant the queue manager could hang
  if a broker was started at the same time. This problem has not
  been experienced by customers but was produced during internal
  testing.
  

Problem conclusion

• The MQ code has been updated to prevent the deadlock.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v7.5       7.5.0.8
  
  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

  WMQ BASE MULTIP

• Fixed component ID

  5724H7241

Applicable component levels