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From "Niklas Therning (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (DIRMINA-169) Deadlock in ThreadPoolFilter
Date Tue, 07 Mar 2006 05:34:39 GMT
     [ http://issues.apache.org/jira/browse/DIRMINA-169?page=all ]

Niklas Therning reassigned DIRMINA-169:
---------------------------------------

    Assign To: Niklas Therning  (was: Trustin Lee)

> Deadlock in ThreadPoolFilter
> ----------------------------
>
>          Key: DIRMINA-169
>          URL: http://issues.apache.org/jira/browse/DIRMINA-169
>      Project: Directory MINA
>         Type: Bug
>     Versions: 0.9
>     Reporter: Rurik Krylov
>     Assignee: Niklas Therning
>      Fix For: 0.9.2

>
> The dedlock occurs in case of simultaniously closing sessions. You can find thread dumps
below. 
> When 2 threads reach synchronized method callDestroyIfNecessary, reference count is 0
already. So first thread tries to interrupt() second worker, but it cannot be interrupted
because it is lying on the synch block. 
> I'm not familar with this architecture, but from my point of of view ThreadPoolFilter
as singleton should not have too many synchronized methods. In this particular case, synchronization
of method callDestroyIfNecessary should be narrowed to synchronisztion collection operations
only.
> filter.destroy() need not of synchronisation, and just it causes the deadlock.
> IoThreadPool-3@547 prio=5, in group "main", status: WAIT
> 	 blocks IoThreadPool-1@548
> 	 blocks SocketAcceptor-0@4e9
> 	  wait():-1, Object.java
> 	  join():1103, Thread.java
> 	  destroy():209, ThreadPoolFilter.java
> 	  callDestroyIfNecessary():171, IoFilterLifeCycleManager.java
> 	  deregister():363, AbstractIoFilterChain.java
> 	  remove():295, AbstractIoFilterChain.java
> 	  clear():304, AbstractIoFilterChain.java
> 	  sessionClosed():168, AbstractIoFilterChain.java
> 	  callNextSessionClosed():453, AbstractIoFilterChain.java
> 	  access$700():52, AbstractIoFilterChain.java
> 	  sessionClosed():742, AbstractIoFilterChain.java
> 	  sessionClosed():165, ProtocolCodecFilter.java
> 	  callNextSessionClosed():453, AbstractIoFilterChain.java
> 	  access$700():52, AbstractIoFilterChain.java
> 	  sessionClosed():742, AbstractIoFilterChain.java
> 	  processEvent():687, ThreadPoolFilter.java
> 	  processEvents():421, ThreadPoolFilter.java
> 	  run():376, ThreadPoolFilter.java
> IoThreadPool-1@548 prio=5, in group "main", status: MONITOR
> 	 waiting for IoThreadPool-3@547
> 	  callDestroyIfNecessary():160, IoFilterLifeCycleManager.java
> 	  deregister():363, AbstractIoFilterChain.java
> 	  remove():295, AbstractIoFilterChain.java
> 	  clear():304, AbstractIoFilterChain.java
> 	  sessionClosed():168, AbstractIoFilterChain.java
> 	  callNextSessionClosed():453, AbstractIoFilterChain.java
> 	  access$700():52, AbstractIoFilterChain.java
> 	  sessionClosed():742, AbstractIoFilterChain.java
> 	  sessionClosed():165, ProtocolCodecFilter.java
> 	  callNextSessionClosed():453, AbstractIoFilterChain.java
> 	  access$700():52, AbstractIoFilterChain.java
> 	  sessionClosed():742, AbstractIoFilterChain.java
> 	  processEvent():687, ThreadPoolFilter.java
> 	  processEvents():421, ThreadPoolFilter.java
> 	  run():376, ThreadPoolFilter.java

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