[FELIX-6450] After upgrading Event admin from 1.4.2 to 1.4.6, Thread blocked observed

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: eventadmin-1.4.4
• Component/s: Event Admin
• Assignee: Unassigned
• Reporter: Arijit Dey
• Created: 24/Aug/21 12:50
• Updated: 14/Jun/22 11:54

Description

in 1.42 we have observed minor memory leak, so we have upgraded Event admin from 1.4.2 to 1.4.6 was Thread blocked observed, the issue still persist with the latest release of event admin.
 

"pool-11-thread-9" #420 prio=5 os_prio=0 tid=0x0000000021c5e000 nid=0x42b4 waiting on condition [0x0000000035b3e000]"pool-11-thread-9" #420 prio=5 os_prio=0 tid=0x0000000021c5e000 nid=0x42b4 waiting on condition [0x0000000035b3e000]   java.lang.Thread.State: TIMED_WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for  <0x00000006c7bf4108> (a java.util.concurrent.Semaphore$NonfairSync) at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215) at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(AbstractQueuedSynchronizer.java:1037) at java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1328) at java.util.concurrent.Semaphore.tryAcquire(Semaphore.java:582) at org.apache.felix.eventadmin.impl.tasks.BlacklistLatch.awaitAndBlacklistCheck(BlacklistLatch.java:88) at org.apache.felix.eventadmin.impl.tasks.SyncDeliverTasks.execute(SyncDeliverTasks.java:125) at org.apache.felix.eventadmin.impl.handler.EventAdminImpl.sendEvent(EventAdminImpl.java:147) at org.apache.felix.eventadmin.impl.security.EventAdminSecurityDecorator.sendEvent(EventAdminSecurityDecorator.java:96) at com.thor.runtime.Deployer.postEvent(Deployer.java:1143) at com.thor.runtime.ApplicationHandler.postApplicationStateChangeEvent(ApplicationHandler.java:1323) at com.thor.runtime.ApplicationHandler.setState(ApplicationHandler.java:1141) at com.frwk.BWApplicationModuleImpl.stopApplication(BWApplicationModuleImpl.java:1077) at com.frwk.BWApplicationModuleImpl.handleEvent(BWApplicationModuleImpl.java:230) at com.thor.runtime.ApplicationEventRecorder.addEventListener(ApplicationEventRecorder.java:209) - locked <0x00000006c4384f48> (a com.thor.runtime.ApplicationEventRecorder) at com.frwk.BWApplicationModuleImpl.init(BWApplicationModuleImpl.java:1011) at com.frwk.BWModuleEventHandler.deployModule(BWModuleEventHandler.java:565) at com.frwk.BWModuleEventHandler.handleBundleEvent(BWModuleEventHandler.java:412) at com.thor.runtime.ApplicationHandler$1.call(ApplicationHandler.java:343) at com.thor.runtime.ApplicationHandler$1.call(ApplicationHandler.java:1) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)
   Locked ownable synchronizers: - <0x00000006c7bf42f0> (a java.util.concurrent.ThreadPoolExecutor$Worker)

"EventAdminThread #19" #71 daemon prio=5 os_prio=0 tid=0x0000000020e3e000 nid=0x1154 waiting for monitor entry [0x000000002decf000]   java.lang.Thread.State: BLOCKED (on object monitor) at com.thor.runtime.ApplicationEventRecorder.handleEvent(ApplicationEventRecorder.java:104) - waiting to lock <0x00000006c4384f48> (a com.thor.runtime.ApplicationEventRecorder) at org.apache.felix.eventadmin.impl.handler.EventHandlerProxy.sendEvent(EventHandlerProxy.java:415) at org.apache.felix.eventadmin.impl.tasks.HandlerTask.run(HandlerTask.java:90) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)
   Locked ownable synchronizers: - <0x00000006c36103c0> (a java.util.concurrent.ThreadPoolExecutor$Worker)

 

 

this leads to deadlock like situation for us. 

Issue Links

• is duplicated by: FELIX-6451 After upgrading Event admin from 1.4.2 to 1.4.6, Thread blocked observed