PH06223: IMS DEPENDENT REGIONS HANG AFTER MQ MEMTERM'ED S40D DUE TO S052 RETURN CODE 212 RC212 END OF MEMORY PROCESSING.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• MQ applications hang after MQ queue manager MEMTERM'ed
  with S40D. This is due to an S052 RC212 abend in end-of-memory
  processing for the queue-maanger address space, due to CSQVATRM
  passing an invalid LX value to LXFRE. This abend means that the
  rest of queue-manager end-of-memory processing, which includes
  abending any application tasks (e.g. a TCB in an IMS dependent
  region), does not take place, hence the hang.
  
  Other symptoms can include CSQVATRM looping during recovery
  processing, causing a leak of SP 231 K7 ECSA storage.
  AD'DL SYMPTOM
  CSQVATRM DEPLETES BTL CSA IF EXECUTED IN ASID 1 ( CSQYGRA1 )
  

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 S052 occurs when the queue        *
  *                      manager is terminated at EOM, leading   *
  *                      to unpredictable behaviour, that can    *
  *                      include applications connected to the   *
  *                      queue manager hanging.                  *
  ****************************************************************
  When the queue manager is terminated at end of memory, CSQVATRM
  is called to clean up queue manager resources, including freeing
  any non-system LX's established by the queue manager.
  However, as CSQVATRM is running in asid 1 in this situation,
  rather than the qmgr asid, the LXFRE request abends S052.
  A subsequent error in the recovery processing for CSQVATRM
  prevents the recovery processing completing, causing the clean
  up to be terminated prematurely.
  Depending on the current state of connections to the qmgr, and
  internal tasks, the skipped processing can lead to further
  errors, such as applications (e.g. batch, IMS, CICS) hanging.
  

Problem conclusion

• CSQVATRM is changed to only attempt to free the LX's if running
  in the qmgr asid.
  

Temporary fix

Comments

APAR Information

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

  PI83520

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

  UI60649 UI60650

Modules/Macros

• CSQVATRM
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI60649

     UP19/01/26 P F901 ¢

• R100 PSY UI60650

     UP19/01/26 P F901 ¢

Fix is available

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