PK12050: WEBSHERE APPLICATION SERVER HANGS DUE TO DEADLOCK IN DISTHUB

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APAR status
Closed as program error.

Error description
Roll up of distributed apar

PK04465 APPLICATION SERVER HANGS.
Application server hangs due to deadlock in disthub
Local fix Problem summary
****************************************************************
* USERS AFFECTED: All users of WebSphere Application Server    *
*                 V5.0 for z/OS                                *
****************************************************************
* PROBLEM DESCRIPTION: Users of WebSphere Application Server   *
*                      for z/OS using HTTP Session             *
*                      memory-to-memory replication or using   *
*                      Dynamic Cache with push or push-pull    *
*                      sharing policy may experience an        *
*                      application server hang due to deadlock *
*                      in disthub code.                        *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The Application server hangs due to deadlock in disthub code.
Here is an example of what may be seen when using tools
(e.g. svcdump.jar,IPCS, etc..)  to view the JVM threads in
the server dump:

 2LKDEADLOCKTHR  Thread
 "com.ibm.disthub.impl.jms.SessionDispatcher@6e87b022"
 (0x7979B528)
 3LKDEADLOCKWTR    is waiting for:
 4LKDEADLOCKMON      sys_mon_t:0x7A69B3F8 infl_mon_t: 0x00000000
 4LKDEADLOCKOBJ
 com.ibm.disthub.impl.jms.SessionDispatcher@3BB90280/3BB90288:
 3LKDEADLOCKOWN    which is owned by:
 2LKDEADLOCKTHR  Thread "P=381229:O=0:CT" (0x302399A8)
 3LKDEADLOCKWTR    which is waiting for:
 4LKDEADLOCKMON      sys_mon_t:0x78E35F28 infl_mon_t: 0x00000000
 4LKDEADLOCKOBJ
 com.ibm.disthub.impl.jms.MessageQueue@3BB83FC0/3BB83FC8:
 3LKDEADLOCKOWN    which is owned by:
 2LKDEADLOCKTHR  Thread
 "com.ibm.disthub.impl.jms.SessionDispatcher@6e87b022"
 (0x7979B528)
 NULL
 NULL
 2LKDEADLOCKTHR  Thread "P=381229:O=0:CT" (0x302399A8)
 3LKDEADLOCKWTR    is waiting for:
 4LKDEADLOCKMON      sys_mon_t:0x78E35F28 infl_mon_t: 0x00000000
 4LKDEADLOCKOBJ
 com.ibm.disthub.impl.jms.MessageQueue@3BB83FC0/3BB83FC8:
 3LKDEADLOCKOWN    which is owned by:
 2LKDEADLOCKTHR  Thread
 "com.ibm.disthub.impl.jms.SessionDispatcher@6e87b022"
 (0x7979B528)
 3LKDEADLOCKWTR    which is waiting for:
 4LKDEADLOCKMON      sys_mon_t:0x7A69B3F8 infl_mon_t: 0x00000000
 4LKDEADLOCKOBJ
 com.ibm.disthub.impl.jms.SessionDispatcher@3BB90280/3BB90288:
 3LKDEADLOCKOWN    which is owned by:
 2LKDEADLOCKTHR  Thread "P=381229:O=0:CT" (0x302399A8)

Most occurences have been between SessionDispatcher and
MessageQueue threads, but the problem is not limited to those
threads.
Problem conclusion
Synchronization locking is fixed to avoid deadlock.

APAR PK12050 is associated with SERVICE LEVEL W502035 of
WebSphere Application Server V5.0 for z/OS.
Temporary fix Comments
APAR information
APAR number PK12050
Reported component name WEBSPHERE FOR Z
Reported component ID 5655I3500
Reported release 500
Status CLOSED PER
PE NoPE
HIPER NoHIPER
Special Attention NoSpecatt
Submitted date 2005-09-17
Closed date 2005-10-21
Last modified date 2005-11-03

APAR is sysrouted FROM one or more of the following:
PK12048

APAR is sysrouted TO one or more of the following:

Modules/Macros
BBOUBINF          

Publications Referenced

Fix information
Fixed component name WEBSPHERE FOR Z
Fixed component ID 5655I3500

Applicable component levels
R500 PSY UK08352    UP05/10/27 P F510

  Fix is available
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Document Information


Current web document: swg1PK12050.html
Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server for z/OS
Operating system(s):
Software version: 500
Software edition:
Reference #: PK12050
IBM Group: Software Group
Modified date: Nov 3, 2005