IT27102: Abnormal termination of amqrmppa process due to a memory overwrite issue

APAR status

• Closed as program error.

Error description

• Abnormal termination of amqrmppa channel process can happen due
  to a memory overwrite, when channel compression is enabled and
  SHARECNV(1).
  
  A memory buffer overwrite can occur when receiving compressed
  messages greater than 32K bytes in size which causes subsequent
  abnormal termination of the MQ channel agent process amqrmppa.
  This can result in various failure data capture (FDC) records
  including:
  amqzxma0 ZX005022 zxcProcessChildren
  lrcW_S_FAST_PATH_APP_DEAD	OK
  runmqlsr	 RN201010
  rppDeadProcessHandler	zrcX_NON_CRITICAL_PROCESS_MISSING OK
  amqzlaa0	 XC307030 xlsRequestMutex
  xecL_W_SEM_OWNER_DIED OK
  

Local fix

• Disable channel compression.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users of MQ 9.1 with channel compression and messages greater
  than 32K bytes in size and SHARECNV value set to 1.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A logic error meant that an incorrectly sized buffer could be
  used by the channel when handling compressed messages. In some
  cases this resulted in a memory overwrite, which terminated the
  channel process.
  

Problem conclusion

• The MQ channel code has been changed to ensure that an
  appropriate size buffer is allocated and used when handling
  large compressed messages.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.1 CD    9.1.2
  v9.1 LTS   9.1.0.2
  
  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

  IBM MQ BASE MP

• Fixed component ID

  5724H7271

Applicable component levels