Java：奇怪的死锁

我的应用程序中有一个死锁，但堆栈跟踪中没有明显的锁定实例。这怎么可能？这是一个错误？Java：奇怪的死锁

jstack -l输出

Full thread dump OpenJDK 64-Bit Server VM (19.0-b09 mixed mode): 

"Attach Listener" daemon prio=10 tid=0x000000000120d000 nid=0x34a9 waiting on condition [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

    Locked ownable synchronizers: 
    - None 

"queue_1" prio=10 tid=0x0000000001043800 nid=0x2ecc waiting for monitor entry [0x00000000426f2000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.getConnectionId(ConnectionManagerImpl.java:20) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.getConnectionId(ConnectionUtils.java:15) 
    at org.seosrv.engines.wordstat.AbstractWordstatEngine.startQueueProcessing(AbstractWordstatEngine.java:56) 
    at org.seosrv.engines.wordstat.WordstatEngineManager$EngineQueueXable.act(WordstatEngineManager.java:155) 
    at org.seosrv.engines.wordstat.WordstatEngineManager$EngineQueueXable.run(WordstatEngineManager.java:145) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"queue_2" prio=10 tid=0x0000000001043000 nid=0x2ecb waiting for monitor entry [0x00000000413a5000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.getConnectionId(ConnectionManagerImpl.java:20) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.getConnectionId(ConnectionUtils.java:15) 
    at org.seosrv.engines.wordstat.AbstractWordstatEngine.startQueueProcessing(AbstractWordstatEngine.java:56) 
    at org.seosrv.engines.wordstat.WordstatEngineManager$EngineQueueXable.act(WordstatEngineManager.java:155) 
    at org.seosrv.engines.wordstat.WordstatEngineManager$EngineQueueXable.run(WordstatEngineManager.java:145) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_1" prio=10 tid=0x0000000001a7c800 nid=0xdb8 waiting for monitor entry [0x00000000433ff000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_2" prio=10 tid=0x0000000003f24800 nid=0xdb5 waiting for monitor entry [0x00000000431fd000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_3" prio=10 tid=0x0000000001578000 nid=0xdb2 waiting for monitor entry [0x00000000424f0000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_4" prio=10 tid=0x0000000003f20000 nid=0xdad waiting for monitor entry [0x0000000042ffb000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_5" prio=10 tid=0x0000000001091000 nid=0xda3 waiting for monitor entry [0x00000000428f4000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_6" prio=10 tid=0x0000000001592000 nid=0xd9d waiting for monitor entry [0x0000000042af6000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_7" prio=10 tid=0x00000000030f5000 nid=0xd98 waiting for monitor entry [0x0000000042efa000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_8" prio=10 tid=0x0000000001094000 nid=0xd92 waiting for monitor entry [0x0000000042bf7000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_9" prio=10 tid=0x0000000001485800 nid=0xd5c waiting for monitor entry [0x0000000041e13000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_10" prio=10 tid=0x0000000003f26800 nid=0xd42 waiting for monitor entry [0x00000000432fe000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_11" prio=10 tid=0x00000000032ed000 nid=0xd34 waiting for monitor entry [0x00000000425f1000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_12" prio=10 tid=0x00000000011b8000 nid=0xd05 waiting for monitor entry [0x00000000427f3000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_13" prio=10 tid=0x000000000104b800 nid=0xcb7 waiting for monitor entry [0x00000000422ee000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_14" prio=10 tid=0x00000000014f9800 nid=0xb3c waiting for monitor entry [0x00000000411f0000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_15" prio=10 tid=0x0000000001213000 nid=0xb25 waiting for monitor entry [0x00000000429f5000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_16" prio=10 tid=0x00000000032fa800 nid=0xabe waiting for monitor entry [0x00000000423ef000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_17" prio=10 tid=0x0000000003f22000 nid=0xaaf waiting for monitor entry [0x00000000430fc000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"actor_18" prio=10 tid=0x0000000001595800 nid=0xa9f waiting for monitor entry [0x0000000042cf8000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.releaseConnectionId(ConnectionManagerImpl.java:29) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.releaseConnectionId(ConnectionUtils.java:19) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.act(SearchEngineContainer.java:352) 
    at org.seosrv.engines.search.SearchEngineContainer$PositionCheckerXable.run(SearchEngineContainer.java:266) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"queue_3" prio=10 tid=0x00000000014f2000 nid=0x890 waiting for monitor entry [0x0000000040b05000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.getConnectionId(ConnectionManagerImpl.java:20) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.getConnectionId(ConnectionUtils.java:15) 
    at org.seosrv.engines.search.SearchEngineContainer.startQueueProcessing(SearchEngineContainer.java:134) 
    at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.act(SearchEngineManager.java:202) 
    at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.run(SearchEngineManager.java:189) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"queue_4" prio=10 tid=0x0000000001039000 nid=0x88f waiting for monitor entry [0x000000004081b000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.getConnectionId(ConnectionManagerImpl.java:20) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.getConnectionId(ConnectionUtils.java:15) 
    at org.seosrv.engines.search.SearchEngineContainer.startQueueProcessing(SearchEngineContainer.java:134) 
    at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.act(SearchEngineManager.java:202) 
    at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.run(SearchEngineManager.java:189) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"queue_5" prio=10 tid=0x0000000001786000 nid=0x88e waiting for monitor entry [0x000000004071a000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.getConnectionId(ConnectionManagerImpl.java:20) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.getConnectionId(ConnectionUtils.java:15) 
    at org.seosrv.engines.search.SearchEngineContainer.startQueueProcessing(SearchEngineContainer.java:134) 
    at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.act(SearchEngineManager.java:202) 
    at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.run(SearchEngineManager.java:189) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"queue_6" prio=10 tid=0x0000000001f96000 nid=0x88d waiting for monitor entry [0x00000000421ed000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.getConnectionId(ConnectionManagerImpl.java:20) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.getConnectionId(ConnectionUtils.java:15) 
    at org.seosrv.engines.search.SearchEngineContainer.startQueueProcessing(SearchEngineContainer.java:134) 
    at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.act(SearchEngineManager.java:202) 
    at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.run(SearchEngineManager.java:189) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"queue_7" prio=10 tid=0x00000000021a3800 nid=0x88c waiting for monitor entry [0x0000000041d12000] 
    java.lang.Thread.State: BLOCKED (on object monitor) 
    at org.seosrv.manager.ConnectionManagerImpl.getConnectionId(ConnectionManagerImpl.java:20) 
    - waiting to lock <0x00007f9fd56f4ab8> (a org.seosrv.manager.ConnectionManagerImpl) 
    at org.seosrv.utility.ConnectionUtils.getConnectionId(ConnectionUtils.java:15) 
    at org.seosrv.engines.search.SearchEngineContainer.startQueueProcessing(SearchEngineContainer.java:134) 
    at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.act(SearchEngineManager.java:202) 
    at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.run(SearchEngineManager.java:189) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"queue_8" prio=10 tid=0x00000000016b9800 nid=0x88b waiting on condition [0x0000000040a04000] 
    java.lang.Thread.State: TIMED_WAITING (sleeping) 
    at java.lang.Thread.sleep(Native Method) 
    at org.seosrv.engines.search.SearchEngineContainer.startQueueProcessing(SearchEngineContainer.java:136) 
    at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.act(SearchEngineManager.java:202) 
    at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.run(SearchEngineManager.java:189) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"DestroyJavaVM" prio=10 tid=0x0000000000cf8800 nid=0x86d waiting on condition [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

    Locked ownable synchronizers: 
    - None 

"Thread-4" prio=10 tid=0x0000000001495800 nid=0x88a runnable [0x0000000041c11000] 
    java.lang.Thread.State: RUNNABLE 
    at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method) 
    at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:228) 
    at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:83) 
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87) 
    - locked <0x00007f9fd5878c78> (a sun.nio.ch.Util$1) 
    - locked <0x00007f9fd5878c90> (a java.util.Collections$UnmodifiableSet) 
    - locked <0x00007f9fd5878c00> (a sun.nio.ch.EPollSelectorImpl) 
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98) 
    at sun.net.httpserver.ServerImpl$Dispatcher.run(ServerImpl.java:307) 
    at java.lang.Thread.run(Thread.java:636) 

    Locked ownable synchronizers: 
    - None 

"server-timer" daemon prio=10 tid=0x0000000001613000 nid=0x889 in Object.wait() [0x0000000040fcc000] 
    java.lang.Thread.State: TIMED_WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    - waiting on <0x00007f9fd5878d78> (a java.util.TaskQueue) 
    at java.util.TimerThread.mainLoop(Timer.java:531) 
    - locked <0x00007f9fd5878d78> (a java.util.TaskQueue) 
    at java.util.TimerThread.run(Timer.java:484) 

    Locked ownable synchronizers: 
    - None 

"InternetCheckerThread" daemon prio=10 tid=0x0000000001310800 nid=0x884 waiting on condition [0x000000004032c000] 
    java.lang.Thread.State: TIMED_WAITING (sleeping) 
    at java.lang.Thread.sleep(Native Method) 
    at org.seosrv.utility.InternetCheckerThread.run(InternetCheckerThread.java:61) 

    Locked ownable synchronizers: 
    - None 

"ConsoleThread" prio=10 tid=0x00000000015e3800 nid=0x883 runnable [0x0000000040ecb000] 
    java.lang.Thread.State: RUNNABLE 
    at java.io.FileInputStream.readBytes(Native Method) 
    at java.io.FileInputStream.read(FileInputStream.java:236) 
    at java.io.BufferedInputStream.read1(BufferedInputStream.java:273) 
    at java.io.BufferedInputStream.read(BufferedInputStream.java:334) 
    - locked <0x00007f9fd54b01c0> (a java.io.BufferedInputStream) 
    at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:282) 
    at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:324) 
    at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:176) 
    - locked <0x00007f9fd56e8a48> (a java.io.InputStreamReader) 
    at java.io.InputStreamReader.read(InputStreamReader.java:184) 
    at java.io.BufferedReader.fill(BufferedReader.java:153) 
    at java.io.BufferedReader.readLine(BufferedReader.java:316) 
    - locked <0x00007f9fd56e8a48> (a java.io.InputStreamReader) 
    at java.io.BufferedReader.readLine(BufferedReader.java:379) 
    at org.fs.jcs.JcsCliThread.run(JcsCliThread.java:97) 

    Locked ownable synchronizers: 
    - None 

"WordstScheduleThread" prio=10 tid=0x000000000172d800 nid=0x882 waiting on condition [0x0000000041f68000] 
    java.lang.Thread.State: TIMED_WAITING (sleeping) 
    at java.lang.Thread.sleep(Native Method) 
    at org.seosrv.engines.wordstat.WordstatEngineManager.launchAndWait(WordstatEngineManager.java:104) 
    at org.seosrv.schedule.WordstatSchedule.fullCheck(WordstatSchedule.java:64) 
    at org.seosrv.schedule.WordstatSchedule.run(WordstatSchedule.java:100) 

    Locked ownable synchronizers: 
    - None 

"PosScheduleThread" prio=10 tid=0x00000000012d1800 nid=0x881 waiting on condition [0x000000004197c000] 
    java.lang.Thread.State: TIMED_WAITING (sleeping) 
    at java.lang.Thread.sleep(Native Method) 
    at org.seosrv.engines.search.SearchEngineManager.launchAndWait(SearchEngineManager.java:121) 
    at org.seosrv.schedule.PositionSchedule.fullCheck(PositionSchedule.java:135) 
    at org.seosrv.schedule.PositionSchedule.run(PositionSchedule.java:326) 

    Locked ownable synchronizers: 
    - None 

"[email protected]" daemon prio=10 tid=0x0000000001787000 nid=0x880 in Object.wait() [0x0000000040c97000] 
    java.lang.Thread.State: TIMED_WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    - waiting on <0x00007f9fd56e8e20> (a java.util.TaskQueue) 
    at java.util.TimerThread.mainLoop(Timer.java:531) 
    - locked <0x00007f9fd56e8e20> (a java.util.TaskQueue) 
    at java.util.TimerThread.run(Timer.java:484) 

    Locked ownable synchronizers: 
    - None 

"Low Memory Detector" daemon prio=10 tid=0x0000000000d8e800 nid=0x876 runnable [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

    Locked ownable synchronizers: 
    - None 

"CompilerThread1" daemon prio=10 tid=0x0000000000d89000 nid=0x875 waiting on condition [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

    Locked ownable synchronizers: 
    - None 

"CompilerThread0" daemon prio=10 tid=0x0000000000d87000 nid=0x874 waiting on condition [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

    Locked ownable synchronizers: 
    - None 

"Signal Dispatcher" daemon prio=10 tid=0x0000000000d85800 nid=0x873 runnable [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

    Locked ownable synchronizers: 
    - None 

"Finalizer" daemon prio=10 tid=0x0000000000d60800 nid=0x870 in Object.wait() [0x00000000416d2000] 
    java.lang.Thread.State: WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    - waiting on <0x00007f9fd54b0550> (a java.lang.ref.ReferenceQueue$Lock) 
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:133) 
    - locked <0x00007f9fd54b0550> (a java.lang.ref.ReferenceQueue$Lock) 
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:149) 
    at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:177) 

    Locked ownable synchronizers: 
    - None 

"Reference Handler" daemon prio=10 tid=0x0000000000d5f000 nid=0x86f in Object.wait() [0x000000004049a000] 
    java.lang.Thread.State: WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    - waiting on <0x00007f9fd54b0630> (a java.lang.ref.Reference$Lock) 
    at java.lang.Object.wait(Object.java:502) 
    at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133) 
    - locked <0x00007f9fd54b0630> (a java.lang.ref.Reference$Lock) 

    Locked ownable synchronizers: 
    - None 

"VM Thread" prio=10 tid=0x0000000000d58000 nid=0x86e runnable 

"VM Periodic Task Thread" prio=10 tid=0x0000000000d91800 nid=0x877 waiting on condition 

JNI global references: 1608

ConnectionManagerImpl是单例，它保证有在其上经由synchronized (conManager) {...}手写代码内没有明确的同步。下面是它的源：

public class ConnectionManagerImpl implements ConnectionManager { 

    private int     maxCons     = 30; 
    private int     lastGrantedConnectionId = 0; 

    private final List <Integer> allConnections   = new ArrayList <Integer>(); 

    @Override 
    public synchronized int getConnectionId(){ 
     if (allConnections.size() >= maxCons) return -1; 
     if (!InternetChecker.waitForInternet()) { //unsynch 
      return -1; 
     } 
     int newId = ++lastGrantedConnectionId; 
     allConnections.add(newId); 
     return newId; 
    } 

    @Override 
    public synchronized void releaseConnectionId(int connectionId){ 
     if (!allConnections.remove(Integer.valueOf(connectionId))) { 
      LogUtils.logError(new InternalException("Finished thread never was registred: " + "networkId = " + connectionId + ", active network IDs: " + allConnections)); 
     } 
    } 
}

VPS配置：CentOS 5的64位，OpenJDK的64位19.0-B09

应用与

-XX拼命地跑：HeapDumpPath = path_here
-XX ：+ HeapDumpOnOutOfMemoryError
-XX：-PrintClassHistogram
-XX：-UseCompressedOops

来源

2011-10-11 Alex Abdugafarov

你怎么知道你已经陷入僵局？哪些线程应该对外部刺激做出响应？ – artbristol

所有'队列'和'演员'都被阻塞，并且它们被同一个实例的相同方法阻塞。但是，我没有看到任何人，谁拥有所需的锁。 –

这个命令是什么“InternetChecker.waitForInternet（）”？这需要很长时间吗？它听起来像它可能... –

我删除一个InternetChecker.waitForInternet()调用，比如乌迪·科恩提出的，这里是我得到了什么：

Exception in thread "queue_1" java.lang.IllegalMonitorStateException 
     at org.seosrv.manager.ConnectionManagerImpl.getConnectionId(ConnectionManagerImpl.java:20) 
     at org.seosrv.utility.ConnectionUtils.getConnectionId(ConnectionUtils.java:15) 
     at org.seosrv.engines.search.SearchEngineContainer.startQueueProcessing(SearchEngineContainer.java:134) 
     at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.act(SearchEngineManager.java:202) 
     at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.run(SearchEngineManager.java:189) 
     at java.lang.Thread.run(Thread.java:636) 

Exception in thread "queue_2" java.lang.IllegalMonitorStateException 
     at org.seosrv.manager.ConnectionManagerImpl.getConnectionId(ConnectionManagerImpl.java:20) 
     at org.seosrv.utility.ConnectionUtils.getConnectionId(ConnectionUtils.java:15) 
     at org.seosrv.engines.search.SearchEngineContainer.startQueueProcessing(SearchEngineContainer.java:134) 
     at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.act(SearchEngineManager.java:202) 
     at org.seosrv.engines.search.SearchEngineManager$EngineQueueXable.run(SearchEngineManager.java:189) 
     at java.lang.Thread.run(Thread.java:636) 

# A fatal error has been detected by the Java Runtime Environment: 
# 
# Internal Error (synchronizer.cpp:1954), pid=15269, tid=1104439616 
# guarantee(mid->header()->is_neutral()) failed: invariant 
# 
# JRE version: 6.0_20-b20 
# Java VM: OpenJDK 64-Bit Server VM (19.0-b09 mixed mode linux-amd64) 
# Derivative: IcedTea6 1.9.8 
# Distribution: CentOS release 5.6 (Final), package rhel-1.22.1.9.8.el5_6-x86_64 
# An error report file with more information is saved as: 
# /hs_err_pid15269.log 
# 
# If you would like to submit a bug report, please include 
# instructions how to reproduce the bug and visit: 
# http://icedtea.classpath.org/bugzilla 
#

我已经注意到了IllegalMonitorStateException下Oracle JDK 1.6.0_27用于c3p0线程，但我认为这是一个c3p0问题。现在我已经更好地测试了它，并且与IBM SDK发生了类似的错误。

看起来这是一个虚拟化错误。感谢你付出的努力。

来源

2011-10-11 09:55:38

（免责声明：我公司开发的JProfiler）

显然，jstack输出中缺少这种情况下的东西。

我建议参考一个不同的工具，从JVMTI分析界面获取这些信息。在JProfiler，你会得到这样一个观点：

enter image description here

来源

2011-10-11 08:20:01

谢谢你的回答，但我没有资金购买商业软件。 –

有一个免费的评估版，功能齐全。 –

你有任何使用OpenJDK的具体原因？

如果不是，您可以切换到另一个JDK以确保这不是JDK实现中的错误。

来源

2011-10-11 10:06:33

查看我自己的答案 - 由于c3p0连接池线程上的IllegalMonitorStateException问题，我从Oracle JDK切换到OpenJDK。我认为这是c3p0的缺陷，但现在它更可能是托管商的虚拟化漏洞。 –

哎呀...对不起。 –

Java：奇怪的死锁

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