PH25064: MQ Z/OS ABEND 0C4-10 IN CSQMCLS2

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• MQ Master ABN=0C4-00000010,C=W9700.800.MMC
  -CSQMCLS2,M=CSQGFRCV,LOC=CSQMLPLM.CSQMCLS2
  The abend in CSQMCLS2 occurs when attempting to close a handle
  that is already closed during deallocation processing,
  resulting in abnormal queue manager termination.
  

Local fix

• na
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 8       *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: If an application is cancelled while    *
  *                      processing a MQSO_CREATE + MQSO_MANAGED *
  *                      MQSUB, then an ABEND0C4 may occur in    *
  *                      CSQMOPNI. Subsequent MQOPEN/MQCLOSE     *
  *                      processing may result in ABEND0C4 being *
  *                      issued from CSQMCLS2 and CSQMOPMD which *
  *                      can result in QMGR termination.         *
  ****************************************************************
  MQ allocates handles to keep track of MQOPEN/MQCLOSE processing.
  When issuing a MQSO_CREATE + MQSO_MANAGED MQSUB call, the
  SYSTEM.NDURABLE.MODEL.QUEUE or SYSTEM.DURABLE.MODEL.QUEUE are
  opened as part of the processing to create the temporary dynamic
  queue for the subscription.
  
  A timing window exists in the end of memory processing which can
  result in the handle for this queue being freed twice, which
  results in the S0C4 abend. Depending on how the handle is
  reused, subsequent abends may occur which can result in QMGR
  termination.
  

Problem conclusion

• The end of memory logic has been changed to no longer free the
  queue handle twice in certain MQSUB timing windows.
  

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:

  PH33087 UI73687

Modules/Macros

• CSQMCLMT
  

Fix information

• Fixed component name

  IBM MQ Z/OS V8

• Fixed component ID

  5655W9700

Applicable component levels

• R000 PSY UI73687

     UP21/03/03 P F103 ¢

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.