PI25817: EG MAY HANG IF ABEND OCCURS DURING CALL TO CSQBBSPIREQ

APAR status

• Closed as program error.

Error description

• It is possible that a WMB/IIB thread might be away in a callback
  function in MQ when another thread abends and issues a signal to
  kill/abort. The first thread would return from MQ and having
  missed the signal, would not terminate. This can result in a
  hung thread and will prevent the EG from shutting down as part
  of the abend recovery process.
  
  If an abending EG does not complete shutdown and appears to be
  hung, then another of its threads might contain the following
  traceback stack:
  
  CSQBBspiREQ
  ImbCbfWorker::processRequests()
  ImbCbf::launch(ImbOsThread*,int)
  ImbCbf::Worker::run(ImbOsThread*)
  ImbThreadPoolThreadFunction::run(ImbOsThread*)
  ImbOsThread::innerThreadBootStrapWrapper(void*)
  ImbOsThread::threadBootStrap(void*)
  threadBootStrapWrapper
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of WebSphere Message Broker V8.0 and IBM Integration
  Bus V9.0 on z/OS.
  
  
  Platforms affected:
  z/OS
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  It is possible that a WMB/IIB thread might be away in a callback
  function in MQ when another thread abends and issues a signal to
  kill/abort. The first thread would return from MQ and having
  missed the signal, would not terminate. This can result in a
  hung thread and will prevent the EG from shutting down as part
  of the abend recovery process.
  
  There are a number of resource name changes between WebSphere
  Message Broker and IBM Integration Bus Version 9.0. For details
  visit
  http://www-01.ibm.com/support/knowledgecenter/SSMKHH_9.0.0/com.i
  bm.etools.mft.doc/bb23814_.htm
  

Problem conclusion

• After all callback functions to MQ, the product now tests for an
  interrupt signal when the thread returns from MQ.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v7.0       7.0.0.8
  v8.0       8.0.0.6
  v9.0       9.0.0.4
  
  The latest available maintenance can be obtained from:
  http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
  
  If the maintenance level is not yet available,information on
  its planned availability can be found on:
  http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
  ---------------------------------------------------------------
  

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

  WEB MB Z/OS

• Fixed component ID

  5697P4400

Applicable component levels

• R800 PSY

     UP