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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-9070" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-0665ccce-738f-42e7-b801-d214e5c3c746" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9070" style="color: #3b73af; text-decoration: none">HHH-9070</a>
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Affects Versions:
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4.1.9
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Unassigned
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Components:
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caching (L2)
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Created:
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20/Mar/14 6:04 AM
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Environment:
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JDK 1.6.0_43 <br /> Hibernate 4.1.9 <br /> Ehcache 2.7.5
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ehcache core
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Reporter:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="Vyacheslav Nikulin" id="email_Vyacheslav Nikulin" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=Vyacheslav+Nikulin" style="color:#6c797f;; color: #3b73af; text-decoration: none">Vyacheslav Nikulin</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">We encountered deadlock with 2 threads.<br /> Here is an extract of the thread dump:<br /> -"gdteam.tmo.common_sv.sfs.MWOExtensionController-20" Id=96 in WAITING on lock=java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync@57ade323<br /> owned by pool-1-thread-4 Id=109<br /> at sun.misc.Unsafe.park(Native Method)<br /> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)<br /> at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811)<br /> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:842)<br /> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1178)<br /> at java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock(ReentrantReadWriteLock.java:807)<br /> at net.sf.ehcache.store.chm.SelectableConcurrentHashMap$Segment.remove(SelectableConcurrentHashMap.java:563)<br /> at net.sf.ehcache.store.chm.SelectableConcurrentHashMap.remove(SelectableConcurrentHashMap.java:393)<br /> at net.sf.ehcache.store.MemoryStore.remove(MemoryStore.java:359)<br /> at net.sf.ehcache.store.MemoryStore.evict(MemoryStore.java:864)<br /> at net.sf.ehcache.store.MemoryStore.removeElementChosenByEvictionPolicy(MemoryStore.java:608)<br /> at net.sf.ehcache.store.MemoryStore.access$600(MemoryStore.java:96)<br /> at net.sf.ehcache.store.MemoryStore$Participant.evict(MemoryStore.java:1245)<br /> at net.sf.ehcache.pool.impl.BalancedAccessEvictor.freeSpace(BalancedAccessEvictor.java:93)<br /> at net.sf.ehcache.pool.impl.AtomicPoolAccessor.add(AtomicPoolAccessor.java:71)<br /> at net.sf.ehcache.pool.impl.AbstractPoolAccessor.add(AbstractPoolAccessor.java:67)<br /> at net.sf.ehcache.store.MemoryStore.put(MemoryStore.java:266)<br /> at net.sf.ehcache.Cache.putInternal(Cache.java:1501)<br /> at net.sf.ehcache.Cache.put(Cache.java:1427)<br /> at net.sf.ehcache.Cache.put(Cache.java:1392)<br /> at org.hibernate.cache.ehcache.internal.regions.EhcacheTransactionalDataRegion.put(EhcacheTransactionalDataRegion.java:141)<br /> at org.hibernate.cache.ehcache.internal.strategy.ReadWriteEhcacheEntityRegionAccessStrategy.afterUpdate(ReadWriteEhcacheEntityRegionAccessStrategy.java:115)<br /> at org.hibernate.cache.ehcache.internal.nonstop.NonstopAwareEntityRegionAccessStrategy.afterUpdate(NonstopAwareEntityRegionAccessStrategy.java:90)<br /> at org.hibernate.action.internal.EntityUpdateAction.doAfterTransactionCompletion(EntityUpdateAction.java:295)<br /> at org.hibernate.engine.spi.ActionQueue$AfterTransactionCompletionProcessQueue.afterTransactionCompletion(ActionQueue.java:705)<br /> at org.hibernate.engine.spi.ActionQueue.afterTransactionCompletion(ActionQueue.java:300)<br /> at org.hibernate.internal.SessionImpl.afterTransactionCompletion(SessionImpl.java:623)<br /> at org.hibernate.engine.transaction.internal.TransactionCoordinatorImpl.afterTransaction(TransactionCoordinatorImpl.java:146)<br /> at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.afterTransactionCompletion(JdbcTransaction.java:138)<br /> at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:180)<br /> at gdteam.tmo.sv.database.entity.transactions.TransactionalTask.commit(TransactionalTask.java:84)<br /> ...<br /> Locked synchronizers: count = 3</p>
<ul class="alternate" type="square">
<li>
java.util.concurrent.locks.ReentrantLock$NonfairSync@4814cbb5
</li>
<li>
java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync@591b3bcd
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<li>
java.util.concurrent.locks.ReentrantLock$NonfairSync@43abe051
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</ul>
<ul class="alternate" type="square">
<li>
"pool-1-thread-4" Id=109 in WAITING on lock=java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync@591b3bcd<br /> owned by gdteam.tmo.common_sv.sfs.MWOExtensionController-20 Id=96<br /> at sun.misc.Unsafe.park(Native Method)<br /> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)<br /> at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811)<br /> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:842)<br /> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1178)<br /> at java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock(ReentrantReadWriteLock.java:807)<br /> at net.sf.ehcache.store.chm.SelectableConcurrentHashMap$Segment.remove(SelectableConcurrentHashMap.java:563)<br /> at net.sf.ehcache.store.chm.SelectableConcurrentHashMap.remove(SelectableConcurrentHashMap.java:393)<br /> at net.sf.ehcache.store.MemoryStore.remove(MemoryStore.java:359)<br /> at net.sf.ehcache.store.MemoryStore.evict(MemoryStore.java:864)<br /> at net.sf.ehcache.store.MemoryStore.removeElementChosenByEvictionPolicy(MemoryStore.java:608)<br /> at net.sf.ehcache.store.MemoryStore.access$600(MemoryStore.java:96)<br /> at net.sf.ehcache.store.MemoryStore$Participant.evict(MemoryStore.java:1245)<br /> at net.sf.ehcache.pool.impl.BalancedAccessEvictor.freeSpace(BalancedAccessEvictor.java:93)<br /> at net.sf.ehcache.pool.impl.AtomicPoolAccessor.add(AtomicPoolAccessor.java:71)<br /> at net.sf.ehcache.pool.impl.AbstractPoolAccessor.add(AbstractPoolAccessor.java:67)<br /> at net.sf.ehcache.store.MemoryStore.put(MemoryStore.java:266)<br /> at net.sf.ehcache.Cache.putInternal(Cache.java:1501)<br /> at net.sf.ehcache.Cache.put(Cache.java:1427)<br /> at net.sf.ehcache.Cache.put(Cache.java:1392)<br /> at org.hibernate.cache.ehcache.internal.regions.EhcacheTransactionalDataRegion.put(EhcacheTransactionalDataRegion.java:141)<br /> at org.hibernate.cache.ehcache.internal.strategy.AbstractReadWriteEhcacheAccessStrategy.putFromLoad(AbstractReadWriteEhcacheAccessStrategy.java:107)<br /> at org.hibernate.cache.ehcache.internal.nonstop.NonstopAwareEntityRegionAccessStrategy.putFromLoad(NonstopAwareEntityRegionAccessStrategy.java:195)<br /> at org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:224)<br /> at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:134)<br /> at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1103)<br /> at org.hibernate.loader.Loader.processResultSet(Loader.java:960)<br /> at org.hibernate.loader.Loader.doQuery(Loader.java:910)<br /> at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:341)<br /> at org.hibernate.loader.Loader.doList(Loader.java:2516)<br /> at org.hibernate.loader.Loader.listUsingQueryCache(Loader.java:2361)<br /> at org.hibernate.loader.Loader.list(Loader.java:2324)<br /> at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:124)<br /> at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1621)<br /> at org.hibernate.internal.CriteriaImpl.list(CriteriaImpl.java:374)<br /> at gdteam.tmo.sv.database.impl.CarDAO.getByUserId(CarDAO.java:24)<br /> ...<br /> Locked synchronizers: count = 3
</li>
<li>
java.util.concurrent.locks.ReentrantLock$NonfairSync@1f1bc339
</li>
<li>
java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync@57ade323
</li>
<li>
java.util.concurrent.locks.ReentrantLock$NonfairSync@72123b72
</li>
</ul>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The reason of the deadlock is unordered acquiring of different locks. More precisely, every thread (MWOExtensionController-20 and pool-1-thread-4) acquired locks (ReentrantReadWriteLock$NonfairSync@57ade323 and ReentrantReadWriteLock$NonfairSync@591b3bcd) in org.hibernate.cache.ehcache.internal.strategy.ReadWriteEhcacheEntityRegionAccessStrategy. And then they thy acquire this locks in reverse order in net.sf.ehcache.store.chm.SelectableConcurrentHashMap$Segment.remove. After that both threads enter in deadlock</p>
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