PI41682: ABN 5C6-00E20017,U=XXXX,C=W9700.800.SSSC-CSQ3AUTH,M=CSQ3AUFR, LOC=CSQSLD1.CSQSTACK+0000024E

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Abend 5C6-00E20017 after starting MQ global trace:
  START TRACE(GLOBAL) DEST(RES,GTF) CLASS(*) RMID(*)
   Change team found a problem with the way MQ manages its stack
  storage when writing trace. The stack section for the trace
  routine is sometimes being marked as free while it is still in
  use. This doesn't cause an issue for the trace function itself
  as the storage is still accessible. However, when the trace
  routine completes it tries to free the stack section again and
  it is detected that the storage is not allocated. This is
  reported as the 5C6-00E20017 abend.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend 5C6-00E20017 issued by CSQSTACK   *
  *                      after MQ GTF trace is enabled.          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When MQ GTF trace is started on a queue manager which previously
  had no trace active, CSQWVCOL may allocate stack storage for
  trace with incorrect settings. This can cause the storage to be
  released while still in use.
  
  Later in processing, CSQWVCOL tries to release the storage
  again, and CSQSTACK issues abend 5C6-00E20017 because the
  storage being released is not in the allocated portion of the
  stack.
  
  An alternative error can occur if the prematurely released stack
  is reused. Overlaid data in the reused segment can cause various
  abends such as 0C4-00000011.
  

Problem conclusion

• CSQWVCOL has been modified to correctly set the values related
  to its stack storage in this case, ensuring that the storage is
  not released while still in use.
  000Y
  CSQSTACK
  CSQWVCOL
  

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:

  UI29753

Modules/Macros

• CSQSTACK CSQWVCOL
  

Fix information

• Fixed component name

  WMQ Z/OS 8

• Fixed component ID

  5655W9700

Applicable component levels

• R000 PSY UI29753

     UP15/08/28 P F508

Fix is available

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