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Posted to dev@jackrabbit.apache.org by "Sebastian Redl (JIRA)" <ji...@apache.org> on 2007/03/17 16:55:09 UTC
[jira] Commented: (JCR-672) Deadlock on concurrent save/checkin
operations possible
[ https://issues.apache.org/jira/browse/JCR-672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12481867 ]
Sebastian Redl commented on JCR-672:
------------------------------------
Is there anything a non-Jackrabbit-developer can do to help? This bug is regularly locking up one of my projects (and in consequence the entire Tomcat process) and I need it fixed ASAP, but I don't know my way around the codebase enough to fix it myself.
> Deadlock on concurrent save/checkin operations possible
> -------------------------------------------------------
>
> Key: JCR-672
> URL: https://issues.apache.org/jira/browse/JCR-672
> Project: Jackrabbit
> Issue Type: Bug
> Components: versioning
> Reporter: Przemo Pakulski
>
> Save and checkin operations are trying to acquire 2 locks in different order, what leads to deadlock.
> ->save
> 1.SharedItemStateManager.acquireWriteLock
> 2.AbstractVersionManager.acquireWriteLock -> locked
> ->checkin
> 1.AbstractVersionManager.acquireWriteLock
> 2.SharedItemStateManager.acquireReadLock -> locked
> "Thread-4" prio=6 tid=0x0312d840 nid=0x824 in Object.wait() [0x03cef000..0x03cefa68]
> at java.lang.Object.wait(Native Method)
> - waiting on <0x23210968> (a EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock)
> at java.lang.Object.wait(Unknown Source)
> at EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock.acquire(Unknown Source)
> - locked <0x23210968> (a EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock)
> at org.apache.jackrabbit.core.version.AbstractVersionManager.acquireWriteLock(AbstractVersionManager.java:124)
> at org.apache.jackrabbit.core.version.VersionManagerImpl.setNodeReferences(VersionManagerImpl.java:413)
> at org.apache.jackrabbit.core.version.VersionItemStateProvider.setNodeReferences(VersionItemStateProvider.java:125)
> at org.apache.jackrabbit.core.state.SharedItemStateManager$Update.end(SharedItemStateManager.java:699)
> at org.apache.jackrabbit.core.state.SharedItemStateManager.update(SharedItemStateManager.java:810)
> at org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:326)
> at org.apache.jackrabbit.core.state.XAItemStateManager.update(XAItemStateManager.java:313)
> at org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:302)
> at org.apache.jackrabbit.core.state.SessionItemStateManager.update(SessionItemStateManager.java:295)
> at org.apache.jackrabbit.core.ItemImpl.save(ItemImpl.java:1204)
> - locked <0x2332eaa0> (a org.apache.jackrabbit.core.XASessionImpl)
> at JrTestDeadlock.run(JrTestDeadlock.java:87)
> "Thread-3" prio=6 tid=0x0312db18 nid=0xa04 in Object.wait() [0x03caf000..0x03cafae8]
> at java.lang.Object.wait(Native Method)
> - waiting on <0x232d1360> (a EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$ReaderLock)
> at java.lang.Object.wait(Unknown Source)
> at EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$ReaderLock.acquire(Unknown Source)
> - locked <0x232d1360> (a EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$ReaderLock)
> at org.apache.jackrabbit.core.state.SharedItemStateManager.acquireReadLock(SharedItemStateManager.java:1361)
> at org.apache.jackrabbit.core.state.SharedItemStateManager.hasItemState(SharedItemStateManager.java:270)
> at org.apache.jackrabbit.core.state.LocalItemStateManager.hasItemState(LocalItemStateManager.java:180)
> at org.apache.jackrabbit.core.state.XAItemStateManager.hasItemState(XAItemStateManager.java:252)
> at org.apache.jackrabbit.core.state.SessionItemStateManager.hasItemState(SessionItemStateManager.java:188)
> at org.apache.jackrabbit.core.ItemManager.itemExists(ItemManager.java:256)
> at org.apache.jackrabbit.core.NodeImpl.hasProperty(NodeImpl.java:1509)
> at org.apache.jackrabbit.core.version.InternalFrozenNodeImpl.checkin(InternalFrozenNodeImpl.java:276)
> at org.apache.jackrabbit.core.version.InternalFrozenNodeImpl.checkin(InternalFrozenNodeImpl.java:248)
> at org.apache.jackrabbit.core.version.InternalVersionHistoryImpl.checkin(InternalVersionHistoryImpl.java:440)
> at org.apache.jackrabbit.core.version.AbstractVersionManager.checkin(AbstractVersionManager.java:397)
> at org.apache.jackrabbit.core.version.VersionManagerImpl$2.run(VersionManagerImpl.java:289)
> at org.apache.jackrabbit.core.version.VersionManagerImpl$DynamicESCFactory.doSourced(VersionManagerImpl.java:611)
> - locked <0x2320c5d8> (a org.apache.jackrabbit.core.version.VersionManagerImpl$DynamicESCFactory)
> at org.apache.jackrabbit.core.version.VersionManagerImpl.checkin(VersionManagerImpl.java:285)
> at org.apache.jackrabbit.core.version.XAVersionManager.checkin(XAVersionManager.java:161)
> at org.apache.jackrabbit.core.NodeImpl.checkin(NodeImpl.java:2944)
> at JrTestDeadlock.run(JrTestDeadlock.java:103)
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