PI45586: CHIN DUMPS CSQY291E ABN= 5C6-00E7014F, ABN= 5C6-00E7014F

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• APAR number PI25738 appeared to resolve problem at first but
  the problem occured again after the PMR was closed.
  CSQY291E CSQXDMPS SDUMPX FAILED, RC=00000B08
  
  PIDS/5655W9700      Program id: 5655W9700
  RIDS/CSQILPLM#L     Load module name: CSQILPLM
  RIDS/CSQIMGE3       Csect name: CSQIMGE3
  AB/S05C6            System abend code: 05C6
  PRCS/00C90600       Abend reason code: 00C90600
  REGS/C112A          Register/PSW difference for R0C:-112A
  RIDS/CSQGFRCV#R     Recovery routine csect name: CSQGFRCV
  
  PSW: 07742001 80000000 00000000 2961D3D8
  HOME ASID: 0085 PRIMARY ASID: 0075 SECONDARY ASID: 0075
  
  The 5C6-00C90600 abend is occurring when EB 242D8CD0 attempts
  to browse the message on pageset 4 page 4 record x16, because
  page 4 only contains a single IRH9 record. The problem appears
  to be due to an orphaned MTME block referencing this message -
  the log buffers show that since the time in the MTME, this page
  has been deallocated and subsequently reused, suggesting that
  the message referred to was previously deleted (unfortunately
  this occurred prior to the available trace or log buffers so I
  can't verify this 100%). When this occurred the MTME for the
  message should have been deleted, however this has not occurred.
  
  The presence of the orphaned MTME causes browsing applications
  to attempt to browse a queue starting from this message -
  depending on how the page has been reused this can lead to the
  reported error. During this incorrect browse operation, locks
  are obtained on the page - this appears to be the cause of the
  subsequent abend in CSQIMGE9, which occurred when the scavenger
  attempted to get an exclusive lock on the same page, but was
  unexpectedly unable to do so.
  
  Additional Symptom(s) Search Keyword(s): z/OS MQ 8.0.0
  ABEND5C6 ABENDS5C6
  performance
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Increased CPU usage and creeping        *
  *                      storage usage detected in queue         *
  *                      managers with applications browsing and *
  *                      marking messages like WSAS JMS MDB      *
  *                      listeners, or applications using        *
  *                      message selection.                      *
  *                                                              *
  *                      The following abends 5C6-00C90600 in    *
  *                      CSQIMGE3 and 5C6-00C90B00 in CSQIMGE9   *
  *                      can be generated as result of this      *
  *                      problem.                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Applications browsing (MQGET with MQGMO_BROWSE_... options) and
  marking messages (MQGMO_MARK_BROWSE_... options) do not unmark
  messages selected as candidates for browsing when the browse
  process detects that the message has been deleted by a
  destructive MQGET (running in another thread) resulting in MTME
  (message token mark entry) records not freed causing the
  creeping storage usage.
  
  The abends in CSQIMGE3 and CSQIMGE9 are caused by CSQMMTIN
  updating cursors in the queue with the stale data found in
  the orphaned MTME records.
  

Problem conclusion

• CSQIMGE1 has been changed to unmark message token entries (MTME)
  for messages deleted during the browse process before trying to
  get the next message in the queue.
  000Y
  CSQIMGE1
  

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:

  UI30405

Modules/Macros

• CSQIMGE1
  

Fix information

• Fixed component name

  WMQ Z/OS 8

• Fixed component ID

  5655W9700

Applicable component levels

• R000 PSY UI30405

     UP15/10/07 P F510 ¢

Fix is available

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