PI19319: WMQ710: ABEND5C6-00940001,CSQMCPRH,M=CSQGFRCV,LOC=CSQMCGLM. CSQMCPRH+00002AE2 14/06/06 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• An ABEND5C6 00940001 is occurring as the execution block has
  EBLTCHLD set to 00000080, indicating that it is still holding
  a class 25 latch.
  
  CSQQTRMN is ending and a 'close all handles' request has been
  issued. The request has been processed, and as class 3 account-
  ing is active CSQ7COLL has been invoked. It gets the latch in
  the WTAS, and as this is a 'close all handles' request for an
  IMS thread the WTAS is queued for processing by CSQ7PLRT.
  However, after the fix for PI05792 CSQ7PLRT no longer gets the
  WTAS latch. This means that it may release the WTAS (and it get
  reused and cleared) before CSQ7COLL attempts to release the
  latch.
  
  If this happens, then when CSQ7COLL does not attempt to release
  the WTAS latch. This results in the subsequent 5C6-00940001
  ABEND issued by CSQMCPRH.
  ADDITIONAL SYMPTOMS : ABEND5C6 CSQ7DEAL ABEND5C6 00E50002
  WHEN PE UI17012 IS APPLIED (OFFSET 658) CAN OCCUR FOR ANY
  TYPE OF APPLICATION. CLASS 3 ACCOUNTING NEED NOT BE ACTIVE
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend 5C6-00940001 in CSQMCPRH occurs   *
  *                      when an IMS transaction ends and class  *
  *                      3 accounting trace is enabled.          *
  *                      or                                      *
  *                      Abend 5C6-00E50002 in CSQ7DEAL occurs   *
  *                      when an application ends.               *
  *                                                              *
  *                      In either case the queue manager is     *
  *                      terminated abnormally S6C6 with         *
  *                      REASON=00940001 or REASON=00F30801.     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  During deallocation processing for a task, the WTAS for the task
  is marked for deallocation processing by CSQ7PLRT under latch
  control.
  PI05792 changed the way that the WTAS was passed to CSQ7PLRT,
  and introduced a timing window that could allow the WTAS to
  be freed and reused by CSQ7PLRT before CSQ7COLL or CSQ7DEAL
  has freed the latch on the WTAS.
  This results in the latch release failing, and one of the
  reported abends occurring, leading to queue manager
  termination.
  

Problem conclusion

• Additional serialisation has been added to CSQ7PLRT to ensure it
  cannot free the WTAS until CSQ7DEAL/CSQ7COLL have finished
  processing it.
  100Y
  CSQ7COLL
  CSQ7DEAL
  CSQ7PLRT
  

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:

  UI18773

Modules/Macros

• CSQ7COLL CSQ7DEAL CSQ7PLRT
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI18773

     UP14/06/27 P F406 «

Fix is available

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