PM83749: Additional fixes to avoid process amqfqpub having high CPU usage

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The WebSphere MQ process amqfqpub has high CPU usage immediately
  after starting the queue manager.
  
  The fix for the root cause of the issue is in APAR IV26834.
  
  This APAR adds further protection to the product code, to avoid
  the infinite loop in future.
  

Local fix

• Disable Pub/Sub function: alter the queue manager parameter
  PSMODE to COMPAT or DISABLED.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 0 Modification 1 and Release 1       *
  *                 Modification 0 using PSMODE ENABLED.         *
  ****************************************************************
  * PROBLEM DESCRIPTION: High CPU usage in the channel initiator *
  *                      in the Queued Pub/Sub Daemon when an    *
  *                      error occurs in startup processing.     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  This error potentially affects all users of queue managers which
  have the queued publish subscribe process running (PSMODE
  ENABLED) when an error occurs in startup processing.
  
  In some circumstances where an error has occurred elsewhere in
  the publish/subscribe components, invalid parameters passed to
  the queued publish/subscribe process can trigger a loop
  condition which causes the Queued Pub/Sub Daemon process in
  fmiBuildStreamsSupported to consume high CPU.
  

Problem conclusion

• The fix for the only known root cause of this issue is included
  with APAR PM69557.
  
  This APAR adds further protection to the product code, to avoid
  the infinite loop in future.
  010Y
  100Y
  CMQXFMIA
  

Temporary fix

Comments

APAR Information

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

  IV31840

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

  UK94286 UK94287

Modules/Macros

• CMQXFMIA
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R010 PSY UK94286

     UP13/06/14 P F306

• R100 PSY UK94287

     UP13/06/14 P F306

Fix is available

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