PI11418: 5C6-00940024 CSQMCTXE,M=CSQGFRCV,LOC=CSQMCLLM.CSQMCTXE+xxxxxxxx

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ABN=5C6-00940024,U=SYSOPR ,C=R3600.710.CMC
  -CSQMCTXE,M=CSQGFRCV,LOC=CSQMCLLM.CSQMCTXE+xxxxxxxx
  
   When the queue manager reconnected to RRS, it went through
  resync processing. This included a check for inflight RRS
  agents (ACE) that needed cleaning up. For each WAS ACE, it
  went through the list of existing context blocks (MCTX);
  for the ones that were no longer required, it set the
  interest data to null, freed the control block and scheduled
  deferred end of context processing.
   When the deferred end of context was processed in CSQMCTXE,
  it looked in the interest data to find the relevant context
  ACE. As this was nulls, it expected the current EB's home
  address space, in this case was the queue manager, to be
  used to locate the appropriate connection manager control
  block (MCLB), which didn't have one.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: The queue manager issues abend          *
  *                      5C6-00940024 when a connected           *
  *                      application address space is abending   *
  *                      and a RRS failure is occurring.         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  There is a small timing window where RRS resync processing
  driven by the queue manager and end of task processing can
  overlap. This can cause an end of context process that was
  scheduled during RRS resync processing to be running for a
  context where the interest has been deleted by end of task
  processing. This causes end of context processing to look for
  a control block that is no longer allocated, and abend with
  5C6-00940024.
  

Problem conclusion

• The code was changed to detect this scenario and handle it
  without issuing an abend.
  100Y
  CSQMCTXE
  

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:

  UI16880 PI44667

Modules/Macros

• CSQMCTXE
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI16880

     UP14/04/23 P F404

Fix is available

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