PM57456: WEBSPHERE MQ V7.1.0 ABN=5C6-00E70002 LOC=CSQXADPM.CSQXSRVR+004CAWHEN QUEUE MANAGER IS STOPPED IN MODE(FORCE)

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• abend5C6-00E70002 in CHIN module CSQXSRVR during
  "stop qmgr mode(force)" .
  From the dump we can see that the CHINIT starts the PubSub
   off-loader tasks for inter-qmgr module CMQXZMUP.
  During its processing it does the following operations :
  .
  psiReceivePSCmds
  psiConnect
  psiConnect
  psiGetMsg
  psiGetMsg
  psiBack
  .
  It opens the queue SYSTEM.INTER.QMGR.CONTROL and sits on an
  MQGET
  waiting for a message to arrive.
  PSMODE(DISABLED) is set in this environment
  At queue manager shutdown, the CHIN adapter tasks end and will
  also return rc2009 (MQRC_CONNECTION_BROKEN) on the MQGET :
  .
  On return from psiGetMsg in CMQXZMUP we check rc2009 and
  if pxgwa->ChinStatusFlags.fStopping is on (which is our case)
  we exit and on exit we do a backout (psiBack ) if there has been
  any error.
  Since at that time all CHINIT servers subtasks have terminated
  (cStartedServers=0 in AST), abend5C6-00E70002 is issued by
  CSQXSRVR.
  .
  cmqxzmup should not perform the psiBack after
  getting rc2009 on psiGetMsg.
  .
  
  additional symptom :
  ABN= 5C6-00E70026,C=R3600.710.CHIN,LOC=CSQXADPM.CSQXADPM+06F9A
  

Local fix

• do a stop qmgr mode(quiesce)
  or
  if psmode(disabled) meaning we do not use pubsub
  then delete the queue SYSTEM.INTER.QMGR.CONTROL
  .
  Do not forget to recreate it once the problem
  is fixed
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABN=5C6-00E70002 in CHINIT              *
  *                      on a STOP QMGR MODE(FORCE).             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  During a STOP QMGR MODE(FORCE) the CHINIT abends with a
  ABN=5C6-00E70002 in CSQXSRVR.
  The source of the error is in CMQXZMUP when a reason code
  2009 (MQRC_CONNECTION_BROKEN) is returned on an MQGET, but
  the action taken on this error issues an MQBACK which will
  attempt to make use of the connection.
  This results in a failure in CSQXSRVR because the CHINIT
  is no longer connected to the queue-manager.
  

Problem conclusion

• CMQXZMUP has been changed to not use the connection when it
  is reported broken during termination.
  100Y
  CMQXZMUP
  

Temporary fix

Comments

APAR Information

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

  PM52452

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

  UK90944

Modules/Macros

• CMQXZMUP
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UK90944

     UP13/02/05 P F302

Fix is available

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