Java: странный тупик

#java #multithreading #deadlock #openjdk

#java #многопоточность #тупиковая ситуация #openjdk #тупик

Вопрос:

У меня тупиковая ситуация в моем приложении, но в трассировке стека нет очевидного экземпляра блокировки. Как это возможно? Это ошибка?

jstack -l вывод

 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

"net.sf.ehcache.CacheManager@45c1f5b2" 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 является одноэлементным, гарантируется, что для него нет явной синхронизации synchronized (conManager) {...} внутри рукописного кода. Вот его источник:

 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));
        }
    }
}

Конфигурация VPS: CentOS 5 x64, 64-разрядная версия OpenJDK 19.0-b09

Приложение запущено с

-XX:HeapDumpPath=path_here
-XX: ошибка HeapDumpOnOutOfMemoryError
-XX:-PrintClassHistogram
-XX:-UseCompressedOops

1. Откуда вы знаете, что у вас тупик? Какой из этих потоков должен реагировать на внешний стимул?

2. Все queue s и actor s заблокированы, и они заблокированы в одном и том же методе одного и того же экземпляра. Однако я не вижу никого, кто на самом деле владеет желаемой блокировкой.

3. Что это за команда «InternetChecker.waitForInternet()»? Может ли это занять много времени? Звучит так, как будто это возможно…

4. InternetChecker.waitForInternet() это блокирующий вызов? если да, getConnectionId() возможно, вы застряли на этом

5. Попробуйте удалить этот вызов (или просто вернуться true ), чтобы он не зависал.

Ответ №1:

Я удалил InternetChecker.waitForInternet() вызов, подобный предложенному Уди Коэном, и вот что я получил:

 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
#

Я уже заметил IllegalMonitorStateException под Oracle JDK 1.6.0_27 для потока c3p0, но я думал, что это проблема c3p0. Теперь я протестировал его лучше и получил аналогичную ошибку с IBM SDK.

Похоже, это ошибка виртуализации. Спасибо за ваши усилия.

Ответ №2:

(Отказ от ответственности: моя компания разрабатывает JProfiler)

Очевидно, что в выводе jstack чего-то не хватает в этом случае.

Я бы рекомендовал обратиться к другому инструменту, который получает эту информацию из интерфейса профилирования JVMTI. В JProfiler вы получаете представление, подобное этому:

введите описание изображения здесь

1. Спасибо за ответ, но у меня нет средств на покупку коммерческого программного обеспечения.

2. Существует бесплатная ознакомительная версия, которая полностью функциональна.

Ответ №3:

Есть ли у вас какая-либо конкретная причина для использования OpenJDK?

Если нет, вы можете переключиться на другой JDK, чтобы убедиться, что это не ошибка в реализации JDK.

1. Смотрите мой собственный ответ — я переключился с Oracle JDK на OpenJDK из-за проблемы с IllegalMonitorStateException потоком пула соединений c3p0. Я думал, что это ошибка c3p0, но теперь это, скорее всего, ошибка виртуализации хостера.