PI46158: WMQ: CLUSTER CHANNEL AUTO-DEFINITION EXIT ABENDS 0C4 REASON 10 15/08/21 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CSQX111E xxx CSQXDISP User channel exit error, TCB=008BBA6
  reason=0C4000-00000010
   Change team found the 0C4 occurs after the fix for PI27234
  when a cluster-sender is started due to a copy of the channel
  being taken from the cluster cache which may have ClusterPtr
  set to a residual value.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: After application of the PTFs for APAR  *
  *                      PI27234 (UI23827), starting an          *
  *                      auto-defined cluster channel after only *
  *                      the channel initiator has been          *
  *                      restarted, can result in an 0C4 abend   *
  *                      when a Channel Auto-Definition (CHAD)   *
  *                      Exit is used.                           *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  APAR PI27234 corrected a storage leak when a CHAD exit is
  defined (CHADEXIT queue manager attribute set). However a logic
  issue exists in the case where the channel definition is read
  from the cluster cache after the channel initiator has been
  restarted (without the queue manager being restarted), the value
  for the list of clusters for the channel is not recalculated,
  allowing the CHAD exit and the relevant processing to
  dereference an invalid pointer address, resulting in an 0C4
  abend.
  

Problem conclusion

• The processing when only the channel initiator is restarted has
  been altered to clear the ClusterPtr, which will result in the
  ClusterPtr being recalculated the next time the auto-defined
  cluster channel is started.
  000Y
  CSQURFXC
  CSQXREXT
  CSQXRFXC
  CSQXRMAS
  CSQXRMSS
  

Temporary fix

Comments

APAR Information

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

  PI37337

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

  UI30535

Modules/Macros

• CSQURFXC CSQXREXT CSQXRFXC CSQXRMAS CSQXRMSS
  

Fix information

• Fixed component name

  WMQ Z/OS 8

• Fixed component ID

  5655W9700

Applicable component levels

• R000 PSY UI30535

     UP15/10/07 P F510 Ø

Fix is available

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