PH26973: ABEND602-000 IN CSQYASCP DURING POST PROCESSING

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• MQ Development finds that, during the process to destroy MQ's
  allied address space authorization a wait call is issued which
  immediately pops, allowing processing to continue. Instead, it
  is expected that the WAIT macro holds further processing until
  the associated ECB has been properly posted ; however, in this
  case the ECB is already in an unexpected posted state (when
  WAIT is called). This apparently led to the ASCE (which
  provides the ASCB reference) to be cleared while its pointer to
  an ASCB was used to issue POST. This APAR intends to clear the
  posted state of the ECB when destroying the MQ allied address
  space authorization, aligning this processing with other
  serialization processes already in MQ.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 0 Modification 0 and Release 1       *
  *                 Modification 0.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend 602-00000000 occurs during        *
  *                      termination/disconnect processing for   *
  *                      an allied application address space.    *
  *                      The abend is followed by abnormal       *
  *                      queue manager termination 6C6 with      *
  *                      REASON=00E80100.                        *
  ****************************************************************
  A rare timing window during connection processing for an allied
  application led to the ASCEIECB being left in a posted state.
  During disconnect processing, the residual post state allows
  CSQYALLI to resume prematurely and free the ASCE for the address
  space while there is an outstanding CSQYAUTH request being
  processed.
  When the outstanding request is completed, an attempt is made
  to post ASCEIECB, but due to the freed ASCE an invalid ASCB is
  passed, leading to the reported abend.
  

Problem conclusion

• CSQYAUTH is changed to clear the ECB after being resumed,
  preventing a residual post state persisting until disconnection.
  

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:

  UI73263 UI73264

Modules/Macros

• CSQYAUTH
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI73264

     UP21/01/28 P F101 ¢

• R100 PSY UI73263

     UP21/01/28 P F101 ¢

Fix is available

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