IT26531: FDC reporting xecF_E_UNEXPECTED_SYSTEM_RC, probe ID XC130031 in xihCheckThreadList when multiple threads end concurrently

APAR status

• Closed as program error.

Error description

• A failure data capture (FDC) record is generated with probe ID
  XC130031 and error code xecF_E_UNEXPECTED_SYSTEM_RC when
  multiple application threads end concurrently without performing
  MQDISC processing.
  
  The stack backtrace shows the following:
  
  mqe!xihCheckThreadList
  mqe!xcsTerminate
  mqe!ziiClearUpAgent
  mqe!zstMQThreadDestructor
  mqe!xppRunDestructors
  mqe!xcsDestroyThread
  mqe!xihCheckThreadList
  mqe!xcsTerminate
  mqe!ziiClearUpAgent
  mqe!zstMQThreadDestructor
  mqe!xppRunDestructors
  mqe!xcsDestroyThread
  mqe!xihCheckThreadList
  mqe!xcsTerminate
  [...]
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  This issue affects users of the IBM MQ applications on Windows,
  where multiple MQ-attached application threads terminate or call
  MQDISC concurrently
  
  
  Platforms affected:
  Windows
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A logic error meant that it was possible for the
  xihCheckThreadList function to be called recursively, which in
  turn resulted in a null pointer being accessed during MQDISC
  processing.
  

Problem conclusion

• The IBM MQ client logic has been updated to prevent recursive
  calls to xihCheckThreadList in this scenario.
  
  ---------------------------------------------------------------
  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