IC61566: Memory leak in the amqrmppa process when SHARECNV value is less than 2 or for pre-V7 MQ clients connecting to V7 queue manager.

WebSphere MQ V7.0 Fix Pack 7.0.1.1
WebSphere MQ V7.0 Fix Pack 7.0.1.2

APAR status

• Closed as program error.

Error description

• The memory used by the channel pooling process (amqrmppa) grows
  continuously until it reaches the process limit, at which point
  resource errors start occurring.
  

Local fix

• not sure
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Any users of WebSphere MQ with pre-V7 clients connecting to a
  V7 queue manager or with SVRCONN channels with a SHARECNV value
  of less than 2.
  
  Platforms affected:
  All Distributed (iSeries, all Unix and Windows)
  ****************************************************************
  PROBLEM SUMMARY:
  The problem was caused by optimisation logic within the channel
  pooling process in order to reduce the performance overhead of
  managing a connection to the queue manager with a shared hConn.
  For pre-V7 clients or if the SHARECNV value is set to less than
  2, the channel pooling process does not require a shared hConn
  handle to the queue manager, so it disconnects and reconnects
  with a normal hConn. However, during this processing, the
  counter which tracks connections to the shared memory IPCC
  subpool became incorrect, leading to a failure to clean up
  connection resources when the thread disconnected from the queue
  manager. This would result in a memory leak of approximately 6Kb
  for every client connection to the queue manager.
  

Problem conclusion

• WebSphere MQ was modified to ensure that the subpool connection
  counter in the channel pooling process was adjusted correctly
  when reconnecting to the IPCC subpool.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
                     v7.0
  Platform           Fix Pack 7.0.1.0
  --------           --------------------
  Windows            U200306
  AIX                U823774
  HP-UX (PA-RISC)    U823665
  HP-UX (Itanium)    U823667
  Solaris (SPARC)    U823772
  Solaris (x86-64)   U824344
  iSeries            tbc_p700_0_1_0
  Linux (x86)        U823664
  Linux (x86-64)     U823773
  Linux (zSeries)    U823668
  Linux (Power)      U823666
  
  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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