PM33487: DEADLOCK IN SIP CONTAINER CODE.

APAR status

• Closed as program error.

Error description

• Deadlock seen in Session Initiation Protocol (SIP) Container
  code in WebSphere Application Server Feature Pack for
  Communications Enabled Applications (CEA).
  
  Ex:"Telephony Command Dispatcher 0" J9VMThread:0x47ECC300,
  j9thread_t:0x4AAF0838, java/lang/Thread:0x02BB1490, state:B,
  prio=5 (native thread ID:0x213C, native priority:0x5,native
  policy:UNKNOWN)
  
  
  Java callstack:at
  com/ibm/ws/sip/container/tu/TransactionUserWrapper.getApplicatio
  nSession(TransactionUserWrapper.java:977(Compiled Code))
  at
  com/ibm/ws/sip/container/servlets/SipSessionImplementation.getAp
  plicationSession(SipSessionImplementation.java:288(Compiled
  Code))
  at
  com/ibm/ws/sip/container/servlets/DRSSipSessionImpl.shouldBeRepl
  icated(DRSSipSessionImpl.java:201(Compiled Code))
  at
  com/ibm/ws/sip/container/failover/FailoverMgrImpl.replicate(Fail
  overMgrImpl.java:461(Compiled Code))
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All IBM WebSphere Application Server Feature*
  *                  Pack for Communications Enabled Applications*
  *                  (CEA) users                                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: Deadlock seen in Session Initiation     *
  *                      Protocol (SIP) Container code           *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When invalidating a SIP application session from a none SIP
  thread, locking of two Objects in a reverse order can cause a
  dead lock situation.
  

Problem conclusion

• The SIP container is locking the same object even when the SIP
  application session access is done from a none SIP thread,
  this approach prevents the SIP container code from locking two
  objects in the reverse order
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 1.0.0.11. Please refer to the Recommended Updates page
  for delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PM31742

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  CEA FEATUREPACK

• Fixed component ID

  5724J0855

Applicable component levels

• R700 PSY

     UP