PI08845: QUEUE MANAGER TERMINATES WITH ABEND6C6 00F3040A

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The queue manager terminates with ABEND6C6 00F3040A when an
  application address space TCB which is connected to the
  queue-manager ends without issuing an MQDISC, and it is the
  only TCB with a connection to the queue-manager at this time,
  and there are other TCBs still active in the application
  address space.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Queue manager terminates with ABEND6C6  *
  *                      00F3040A.                               *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The problem occurs when an application address space TCB which
  is connected to the queue-manager ends without issuing an
  MQDISC, and it is the only TCB with a connection to the
  queue-manager at this time, and there are other TCBs still
  active in the application address space.
  During end-of-task processing for the connected TCB the
  associated ACE is scheduled for deferred end-of-task processing,
  which takes place asynchronously in the queue-manager address
  space. End-of-task processing for the TCB then continues and
  detects that there are no longer any connected TCBs in the
  application address space. It then detects that there is
  outstanding deferred end-of-task processing, and waits a second
  for it to complete. It then checks to see if there is still
  deferred end-of-task procressing in progress, and also checks if
  there are any ACEs still present which are not queued for
  deferred end-of-task processing, but which are holding a latch
  or are in 'must-complete' state (i.e. commit or deallocate
  processing is still taking place).
  However, at the time this check is performed (by CSQ3SSI2),
  CSQMDISC (which is invoked during end-of-task processing in the
  queue-manager address space) has scheduled an SRB to perform
  some cleanup in the application address space. This results in
  there now being an ACE on the VLCA system agent chain chain for
  the application address space which is not queued for deferred
  end-of-task processing. It may be that this ACE is holding a
  latch at the time of the check by CSQ3SSI2, in which case the
  6C6 00F3040A will occur.
  

Problem conclusion

• CSQMDISC and CSQ3TM00 have been changed so that the SRB invoked
  to clean up the applied address space uses the same RELATED ACE
  that is already in deferred END-OF-TASK processing.
  100Y
  CSQMDISC
  CSQ3TM00
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  UI16530

Modules/Macros

• CSQMDISC CSQ3TM00
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI16530

     UP14/04/23 P F404 ¢

Fix is available

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