PI30908: WMQ ABEND0C4 IN CSQ3RRSM REPORTED BY MESSAGE CSQ3009E 14/12/16 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• WebSphere MQ may suffer with ABEND0C4 in CSQ3RRSM or CSQAPRHX
  .
  Level 3 finds that MQ's exit ( CSQ3RRSX ) should be issuing a
  CTXSCID to set the context interest data to 0 (the context end-
  context). CSQ3RRSX used to contain code for doing this,
  but it was removed by UK94940 (PM82897) to avoid a timing
  window with MQ shutdown processing.
  
  In some circumstances, the queue manager may become unresponsive
  to shutdown, cancel and force commands.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 0 Modification 1 and Release 1       *
  *                 Modification 0.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: After the application of PTFs for       *
  *                      PM82897 (UK94940/UK94941). During an    *
  *                      abend of an application using RRS (such *
  *                      as using WebSphere Application Server)  *
  *                      the subsequent EOT processing for any   *
  *                      units of work may result in 0C4 abends  *
  *                      in CSQ3RRSM, CSQAPRHX, CSQ3EOM0,        *
  *                      CSQ3RRSX or CSQMCPRH; aswell as 30D or  *
  *                      5C6-00E50079 abend issued within        *
  *                      CSQVSRX, depending on the exact         *
  *                      sequence of events and timing windows.  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When an application that does in-syncpoint MQ work abends, RRS
  EOT processing invokes CSQ3RRSX to perform end-context. After
  PM82897, the associated ACE in this scenario is released by
  CSQ3RRSX without clearing the context interest data. Where
  further processing for the abend may occur, such as by WebSphere
  Applications Server's resource manager, CSQ3RRSX may be invoked
  again for the same context. However, as the context interest
  data was not cleared CSQ3RRSX may release the ACE again.
  This can result in the 0C4 abends seen, as well as the
  5C6-00E50079 or 30D abend in CSQVSRX, as the processing in MQ
  will attempt to access the previously released ACE. The queue
  manager may then terminate abnormally, as indicated by CSQV086E
  with reason codes 00E50710 or 00F30411 for example.
  

Problem conclusion

• End context processing in CSQ3RRSX has been altered to clear
  the context interest data in this scenario when the ACE is
  released, to prevent errors and abends due to later processing.
  010Y
  100Y
  CSQARIB
  CSQMCLMT
  CSQMCTXE
  CSQMCTXS
  CSQNINS
  CSQ3AAES
  CSQ3AMT3
  CSQ3RRSF
  CSQ3RRSI
  CSQ3RRSM
  CSQ3RRSR
  CSQ3RRSX
  CSQ3RRXF
  CSQ5CONN
  CSQ5MONR
  CSQ5WXCF
  CSQ7CB9
  

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:

  PI31377 UI24445 UI24446

Modules/Macros

• CSQARIB  CSQMCLMT CSQMCTXE CSQMCTXS CSQNINS
  CSQ3AAES CSQ3AMT3 CSQ3RRSF CSQ3RRSI CSQ3RRSM CSQ3RRSR CSQ3RRSX
  CSQ3RRXF CSQ5CONN CSQ5MONR CSQ5WXCF CSQ7CB9
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R010 PSY UI24445

     UP15/02/04 P F502 «

• R100 PSY UI24446

     UP15/02/04 P F502 «

Fix is available

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