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  1. Jackrabbit Oak
  2. OAK-3235

Deadlock when closing a concurrently used FileStore

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    Description

      A deadlock was detected while stopping the SegmentCompactionIT using the exposed MBean.

      Found one Java-level deadlock:
      =============================
      "pool-1-thread-23":
        waiting to lock monitor 0x00007fa8cf1f0488 (object 0x00000007a0081e48, a org.apache.jackrabbit.oak.plugins.segment.file.FileStore),
        which is held by "main"
      "main":
        waiting to lock monitor 0x00007fa8cc015ff8 (object 0x00000007a011f750, a org.apache.jackrabbit.oak.plugins.segment.SegmentWriter),
        which is held by "pool-1-thread-23"
      
      Java stack information for the threads listed above:
      ===================================================
      "pool-1-thread-23":
      	at org.apache.jackrabbit.oak.plugins.segment.file.FileStore.writeSegment(FileStore.java:948)
      	- waiting to lock <0x00000007a0081e48> (a org.apache.jackrabbit.oak.plugins.segment.file.FileStore)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.flush(SegmentWriter.java:228)
      	- locked <0x00000007a011f750> (a org.apache.jackrabbit.oak.plugins.segment.SegmentWriter)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.prepare(SegmentWriter.java:329)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeListBucket(SegmentWriter.java:447)
      	- locked <0x00000007a011f750> (a org.apache.jackrabbit.oak.plugins.segment.SegmentWriter)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeList(SegmentWriter.java:698)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1190)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135)
      	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:400)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135)
      	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:400)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135)
      	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:400)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135)
      	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:400)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135)
      	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:400)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135)
      	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:400)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135)
      	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:400)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1154)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeBuilder.getNodeState(SegmentNodeBuilder.java:100)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeBuilder.updated(SegmentNodeBuilder.java:85)
      	at org.apache.jackrabbit.oak.plugins.memory.MemoryNodeBuilder.updated(MemoryNodeBuilder.java:214)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeBuilder.updated(SegmentNodeBuilder.java:81)
      	at org.apache.jackrabbit.oak.plugins.memory.MemoryNodeBuilder.setChildNode(MemoryNodeBuilder.java:346)
      	at org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeAdded(AbstractRebaseDiff.java:211)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:527)
      	at org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeChanged(AbstractRebaseDiff.java:219)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:531)
      	at org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeChanged(AbstractRebaseDiff.java:219)
      	at org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:418)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:583)
      	at org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeChanged(AbstractRebaseDiff.java:219)
      	at org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:418)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:583)
      	at org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeChanged(AbstractRebaseDiff.java:219)
      	at org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:418)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:583)
      	at org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeChanged(AbstractRebaseDiff.java:219)
      	at org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:418)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:583)
      	at org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeChanged(AbstractRebaseDiff.java:219)
      	at org.apache.jackrabbit.oak.plugins.segment.MapRecord$2.childNodeChanged(MapRecord.java:404)
      	at org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:488)
      	at org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:394)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:583)
      	at org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeChanged(AbstractRebaseDiff.java:219)
      	at org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:488)
      	at org.apache.jackrabbit.oak.plugins.segment.MapRecord.compareBranch(MapRecord.java:565)
      	at org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:470)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:583)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore$Commit.prepare(SegmentNodeStore.java:446)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore$Commit.optimisticMerge(SegmentNodeStore.java:471)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore$Commit.execute(SegmentNodeStore.java:527)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore.merge(SegmentNodeStore.java:205)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentCompactionIT$RandomWriter.call(SegmentCompactionIT.java:426)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentCompactionIT$RandomWriter.call(SegmentCompactionIT.java:399)
      	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
      	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
      	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
      	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
      	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
      	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
      	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
      	at java.lang.Thread.run(Thread.java:745)
      "main":
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.dropCache(SegmentWriter.java:850)
      	- waiting to lock <0x00000007a011f750> (a org.apache.jackrabbit.oak.plugins.segment.SegmentWriter)
      	at org.apache.jackrabbit.oak.plugins.segment.file.FileStore.close(FileStore.java:830)
      	- locked <0x00000007a0081e48> (a org.apache.jackrabbit.oak.plugins.segment.file.FileStore)
      	at org.apache.jackrabbit.oak.plugins.segment.SegmentCompactionIT.tearDown(SegmentCompactionIT.java:266)
      	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      	at java.lang.reflect.Method.invoke(Method.java:497)
      	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
      	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
      	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
      	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:36)
      	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
      	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
      	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
      	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
      	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
      	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
      	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
      	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
      	at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
      	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
      	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
      	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
      	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      	at java.lang.reflect.Method.invoke(Method.java:497)
      	at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
      	at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
      	at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
      	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
      	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
      
      Found 1 deadlock.
      

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            mduerig Michael Dürig
            frm Francesco Mari
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              Updated:
              Resolved:

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