PI70532: LOOP IN CSQIORF2 following structure failure and reconnection toDB2.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When reconnecting to DB2, the DB2MST00 task can enter an
  indefinite loop in CSQIORF2 if a structure failed earlier, and
  any IVSAs were successfully orphaned.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users of IBM MQ for z/OS Version 9 Release 0             *
  * Modification 0.                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * High cpu caused by an loop indefinite loop in module         *
  * CSQIORF2 occurs when the queue manager reconnects to DB2,    *
  * following an earlier structure failure.                      *
  * Other symptoms include:                                      *
  *  - Commands to suspend or resume the queue manager's         *
  * connection to DB2 fail                                       *
  *  - The queue manager hangs during shutdown                   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * None                                                         *
  ****************************************************************
  When a structure fails, the queue manager attempts to close the
  connection to all shared queues held on that structure. If any
  cannot be closed (for example, if an application has an open
  handle to a queue), the IVSA control block for the queue is
  orphaned, and a new IVSA is created for the queue.
  If the queue manager subsequently disconnects from and
  reconnects to DB2, the chain of orphan IVSA's is scanned to
  determine if any new IVSA's are required. However an error in
  this processing can cause the same IVSA to be  examined
  repeatedly, leading to the task looping indefinitely.
  

Problem conclusion

• The loop logic in CSQIORF2 has been corrected to prevent the
  loop occurring.
  

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:

  UI43965

Modules/Macros

• CSQIORF2
  

Fix information

• Fixed component name

  MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI43965

     UP17/02/08 P F702

Fix is available

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