PI79124: ABN=5C6-00A30064,U=XXXXCHIN,C=R3600.710.TOPM-CSQTOFLT,M=CSQGFRCV,LOC=CSQTOPLM.CSQTOFLT+0000079E AFTER ADD A SUBSCRIPTION

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CHINIT is issuing an ABEND 5C6-00A30064 (Free lock failed) in
  CSQTOFLT when adding a subscription to a topic to publish on a
  remote queue. When the subscriptions are deleted the problem
  dissapears.
  
  QMGR has a QALIAS for SYSTEM.ADMIN.QMGR.EVENT which has a
  target queue of topic MQMA_TOPIC_QMGREVENTS. There is a
  subscriber to this queue, MQMA.SUBSCRIPTION.QMGREVENTS.MB,
  which has a destination queue of MB.ALIAS.MQMA.EVENTS but no
  such queue of this name exists.  Channel SYSTEM.ADMIN.SVRCONN
  checks for the presence of queue
  SYSTEM.PROTECTION.POLICY.QUEUE, but the queue does not exist. As
  the queue-manager has queue-manager local events enabled, an
  'Unknown Object Name' event message needs to be generated.
  However, when the queue- manager tries to publish to the
  subcriber queue for MQMA.SUBSCRIPTION.QMGREVENTS.MB,
  MB.ALIAS.MQMA.EVENTS, MQRC_UNKNOWN_OBJECT_NAME occurs and there
  is another attempt to generate an an 'Unknown Object name'
  event message. This leads to a loop in processing, which
  eventually ends with the 5C6-00A30064 abend.
  

Local fix

• No local fix.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend 5C6-00A30064 occurs in            *
  *                      CSQTLPLM.CSQTOFLT when generating an    *
  *                      event message, and the event queue has  *
  *                      been redefined as a topic alias.        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  While opening or putting to a queue, an event message was
  generated and put to the event queue (e.g.
  SYSTEM.ADMIN.QMGR.EVENT, SYSTEM.ADMIN.PERFM.EVENT). The event
  queue had been redefined as a topic alias, and so CSQMTPUT was
  called to deliver a copy of the event message to each
  subscriber. However while putting to a subscriber's destination
  queue an error occurring that resulted in an event message being
  generated. This was also published and failed to be delivered in
  the same way, causing another event message to be generated.
  After recursively generating event messages, a further error
  occurs, resulting in a lock being released twice and causing
  the reported abend to occur.
  

Problem conclusion

• Publish processing is changed to detect when it has been called
  to publish an event message, and to skip generating further
  event messages as part of the publish operation.
  100Y
  CSQMIARC
  CSQMOPNI
  CSQMTPUT
  

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:

  PI87560 PI87573 UI50705

Modules/Macros

• CSQMIARC CSQMOPNI CSQMTPUT
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI50705

     UP17/10/27 P F710

Fix is available

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