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 disthubLocal 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 is sysrouted FROM one or more of the following: PK12048 APAR is sysrouted TO one or more of the following: Modules/Macros
Publications Referenced
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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
(C) Copyright IBM Corporation 2000, 2009. All Rights Reserved.