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From "Jukka Zitting (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JCR-3226) stateCreated deadlock
Date Mon, 06 Feb 2012 11:49:59 GMT
stateCreated deadlock
---------------------

                 Key: JCR-3226
                 URL: https://issues.apache.org/jira/browse/JCR-3226
             Project: Jackrabbit Content Repository
          Issue Type: Bug
          Components: jackrabbit-core
    Affects Versions: 2.2, 2.4
            Reporter: Jukka Zitting


In JCR-2650 a potential deadlock in SessionItemStateManager.stateModified() got fixed by postponing
the work to the save() call.

Unfortunately this still leaves the stateCreated() method vulnerable to a similar (though
much less likely) deadlock scenario (observed in Jackrabbit 2.2.x):

Thread A:
	at org.apache.jackrabbit.core.state.NodeState.copy(NodeState.java:118)
	- waiting to lock <0x00007ffec8ddfa18> (a org.apache.jackrabbit.core.state.NodeState)
	- locked <0x00007ffec8ddf9d8> (a org.apache.jackrabbit.core.state.NodeState)
	at org.apache.jackrabbit.core.state.ItemState.pull(ItemState.java:152)
	- locked <0x00007ffec8ddf9d8> (a org.apache.jackrabbit.core.state.NodeState)
	at org.apache.jackrabbit.core.state.SessionItemStateManager.stateCreated(SessionItemStateManager.java:791)
	at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateCreated(StateChangeDispatcher.java:94)
	at org.apache.jackrabbit.core.state.LocalItemStateManager.stateCreated(LocalItemStateManager.java:428)
	at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateCreated(StateChangeDispatcher.java:94)
	at org.apache.jackrabbit.core.state.SharedItemStateManager.stateCreated(SharedItemStateManager.java:398)
	at org.apache.jackrabbit.core.state.ItemState.notifyStateCreated(ItemState.java:231)
	at org.apache.jackrabbit.core.state.ChangeLog.persisted(ChangeLog.java:309)
	at org.apache.jackrabbit.core.state.SharedItemStateManager$Update.end(SharedItemStateManager.java:777)
	at org.apache.jackrabbit.core.state.SharedItemStateManager.update(SharedItemStateManager.java:1488)
	at org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:351)
	at org.apache.jackrabbit.core.state.XAItemStateManager.update(XAItemStateManager.java:354)
	at org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:326)
	at org.apache.jackrabbit.core.state.SessionItemStateManager.update(SessionItemStateManager.java:289)
	at org.apache.jackrabbit.core.ItemSaveOperation.perform(ItemSaveOperation.java:258)
	at org.apache.jackrabbit.core.session.SessionState.perform(SessionState.java:200)
	at org.apache.jackrabbit.core.ItemImpl.perform(ItemImpl.java:91)
	at org.apache.jackrabbit.core.ItemImpl.save(ItemImpl.java:329)

Thread B:
	at org.apache.jackrabbit.core.state.NodeState.copy(NodeState.java:119)
	- waiting to lock <0x00007ffec8ddf9d8> (a org.apache.jackrabbit.core.state.NodeState)
	- locked <0x00007ffec8ddfa18> (a org.apache.jackrabbit.core.state.NodeState)
	at org.apache.jackrabbit.core.NodeImpl.makePersistent(NodeImpl.java:869)
	- locked <0x00007ffec8ddfa18> (a org.apache.jackrabbit.core.state.NodeState)
	at org.apache.jackrabbit.core.ItemSaveOperation.persistTransientItems(ItemSaveOperation.java:836)
	at org.apache.jackrabbit.core.ItemSaveOperation.perform(ItemSaveOperation.java:243)
	at org.apache.jackrabbit.core.session.SessionState.perform(SessionState.java:200)
	at org.apache.jackrabbit.core.ItemImpl.perform(ItemImpl.java:91)
	at org.apache.jackrabbit.core.ItemImpl.save(ItemImpl.java:329)
	at org.apache.jackrabbit.core.session.SessionSaveOperation.perform(SessionSaveOperation.java:42)
	at org.apache.jackrabbit.core.session.SessionState.perform(SessionState.java:200)
	at org.apache.jackrabbit.core.SessionImpl.perform(SessionImpl.java:355)
	at org.apache.jackrabbit.core.SessionImpl.save(SessionImpl.java:758)

IIUC this can only occur when two sessions are concurrently importing a node with the same
UUID.

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