IV22632: WEBSPHERE MQ 7.1 REPOSITORY CACHE INITIALIZATION CAN CAUSE SIGSEGV IN ZXCCREATECACHESHELL

Fix Pack 7.1.0.2 for WebSphere MQ V7.1
WebSphere MQ V7.5 Fix Pack 7.5.0.1

APAR status

• Closed as program error.

Error description

• There is an issue relating to the repository cache
  initialisation at MQ 7.1 that can lead to a SIGSEGV for very
  large repository queue sizes, and prevention of queue manager
  restart. FDC produced is-
  .
  Probe Id          :- XC130004
  Application Name  :- MQM
  Component         :- xehExceptionHandler
  Program Name      :- amqzxma0
  Major Errorcode   :- STOP
  Minor Errorcode   :- OK
  Probe Type        :- HALT6109
  Probe Description : AMQ6109: An internal WebSphere MQ error
  has occurred
  FDCSequenceNumber :- 0
  Arith1            :- 11 (0xb)
  Comment1          :- SIGSEGV: invalid address permissions
  .
  MQM Function Stack
  ExecCtrlrMain
  zxcStartupLogic
  zxcPostInitialiseSetup
  zxcCreateRepositoryCache
  zxcCreateCacheShell
  xcsFFST
  .
  MQM Trace History
  .
  .
  .
  -{ xcsAllocateMemBlock
  --{ xstAllocateMemBlockFromHeap
  Data: 0x00000001 0x00000000 0x00000000 0x004a6d88
  --} xstAllocateMemBlockFromHeap rc=OK
  -} xcsAllocateMemBlock rc=OK
  -{ xlsRequestMutex
  -} xlsRequestMutex rc=OK
  -{ xlsReleaseMutex
  -} xlsReleaseMutex rc=OK
  } xcsCreateSharedMemSet rc=OK
  { xcsFFST
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  You may be affected by this problem if you are using MQ 7.1 and
  have an exceptionally large SYSTEM.CLUSTER.REPOSITORY.QUEUE when
  attempting to start a queue manager. The queue would need to be
  about 4Gb or more in size to encounter this problem.
  
  Platforms affected:
  All Distributed (iSeries, all Unix and Windows)
  ****************************************************************
  PROBLEM SUMMARY:
  The problem is caused by failure to properly handle internal
  repository sizing calculations correctly when close to the
  internal repository size limit of 4Gb.
  

Problem conclusion

• N/A
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v7.0       7.0.1.10
  v7.1       7.1.0.2
  v7.5       7.5.0.1
  
  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:

  PM67921

Fix information

• Fixed component name

  WMQ LIN X86 V7

• Fixed component ID

  5724H7224

Applicable component levels

• R710 PSY

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