IC64121: Queue manager terminates abnormally. An FDC with Probe ID XC130031 is produced in the amqzmuc0 process.

WebSphere MQ V7.0 Fix Pack 7.0.1.2
WebSphere MQ V7.0.1 for i5/OS Fix Pack 7.0.1.2

APAR status

• Closed as program error.

Error description

• The queue manager terminated abnormally as the result of an
  access violation originating in the critical process manager
  (amqzmuc0). An FDC with Probe ID XC130031 exhibited the
  following stack at the time of the failure:
  
  zmuThreadMain
  zmuExpirerTask
  kpiExpirerTask
  apiGetMessage
  aqmGetMessage
  aqhGetMessage
  xcsGetMemFn
  xcsFFST
  
  The actual failure occurred during an operating system malloc
  operation indicative of a heap corruption within the process.
  The stack shows that MQ was attempting to expire messages at
  the time of the failure.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Any users of WebSphere MQ who are expiring a high volume of
  messages.
  
  Platforms affected:
  All Distributed (iSeries, all Unix and Windows)
  ****************************************************************
  PROBLEM SUMMARY:
  The problem was caused due to the fact that the expirer thread
  was repeatedly reaching its expiry limit of 102 messages. This
  resulted in an error being returned from the get operation to
  the caller (the expirer thread). However, during get processing
  for expired messages, if the message does not fit into the
  buffer provided by the caller, MQ will allocate a larger buffer
  for the message and update a variable which tracks the size of
  the buffer. Under the error condition outlined above, MQ
  was returning the original buffer to the caller with the
  incorrect updated length. As a result, subsequent calls using
  the same buffer with the incorrect length would result in
  buffer overruns, thus corrupting the heap.
  

Problem conclusion

• WebSphere MQ was modified to ensure that the buffer size is
  maintained correctly to reflect the actual buffer size on exit
  from the get processing routine.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
                     v7.0
  Platform           Fix Pack 7.0.1.2
  --------           --------------------
  Windows            U200316
  AIX                U829807
  HP-UX (PA-RISC)    U829678
  HP-UX (Itanium)    U829681
  Solaris (SPARC)    U829806
  Solaris (x86-64)   U829680
  iSeries            tbc_p700_0_1_2
  Linux (x86)        U829677
  Linux (x86-64)     U829676
  Linux (zSeries)    U829682
  Linux (Power)      U829679
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available, information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

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:

Fix information

• Fixed component name

  WMQ WINDOWS V7

• Fixed component ID

  5724H7220

Applicable component levels

• R700 PSY

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