Hi everyone!
I was debugging through JenkinsRule from Jenkins Test Harness. After the
Jetty server and Jenkins have both been terminated in JenkinsRule#after() (line
488
<https://github.com/jenkinsci/jenkins-test-harness/blob/2281a68194604c983e7a8d1e7822379b262f153d/src/main/java/org/jvnet/hudson/test/JenkinsRule.java#L488>
and line 502
<https://github.com/jenkinsci/jenkins-test-harness/blob/2281a68194604c983e7a8d1e7822379b262f153d/src/main/java/org/jvnet/hudson/test/JenkinsRule.java#L502>,
respectively) stray threads keep running. Attached is the dump of the
running threads. Is it possible to terminate these threads to allow the JVM
to exit gracefully?
This issue may already have been reported before in this Stack Overflow
question:
https://stackoverflow.com/questions/13769007/jetty-server-leaves-behind-threads-after-stop
A minimal example would be following test code and setting a breakpoint at
the System.gc() call on line 517:
import org.junit.Rule;
import org.junit.Test;
import org.jvnet.hudson.test.JenkinsRule;
public class RandomTest {
@Rule
public JenkinsRule jenkinsRule = new JenkinsRule();
@Test
public void randomTest() {
System.out.println("Hello world");
}
}
Thanks
Abhyudaya Sharma
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"qtp593573025-56@5562" prio=5 tid=0x38 nid=NA runnable
java.lang.Thread.State: RUNNABLE
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(WindowsSelectorImpl.java:-1)
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.java:296)
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(WindowsSelectorImpl.java:278)
at
sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:159)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x16d8> (a sun.nio.ch.WindowsSelectorImpl)
- locked <0x16d9> (a java.util.Collections$UnmodifiableSet)
- locked <0x16da> (a sun.nio.ch.Util$3)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:101)
at
org.eclipse.jetty.io.ManagedSelector$SelectorProducer.select(ManagedSelector.java:234)
at
org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:187)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:211)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:126)
at
org.eclipse.jetty.io.ManagedSelector$$Lambda$10.1688310330.run(Unknown
Source:-1)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:672)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:590)
at java.lang.Thread.run(Thread.java:748)
"qtp593573025-55@5561" prio=5 tid=0x37 nid=NA runnable
java.lang.Thread.State: RUNNABLE
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(WindowsSelectorImpl.java:-1)
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.java:296)
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(WindowsSelectorImpl.java:278)
at
sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:159)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x16db> (a sun.nio.ch.WindowsSelectorImpl)
- locked <0x16dc> (a java.util.Collections$UnmodifiableSet)
- locked <0x16dd> (a sun.nio.ch.Util$3)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:101)
at
org.eclipse.jetty.io.ManagedSelector$SelectorProducer.select(ManagedSelector.java:234)
at
org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:187)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:211)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:126)
at
org.eclipse.jetty.io.ManagedSelector$$Lambda$10.1688310330.run(Unknown
Source:-1)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:672)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:590)
at java.lang.Thread.run(Thread.java:748)
"qtp593573025-54@5560" prio=5 tid=0x36 nid=NA runnable
java.lang.Thread.State: RUNNABLE
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(WindowsSelectorImpl.java:-1)
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.java:296)
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(WindowsSelectorImpl.java:278)
at
sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:159)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x16de> (a sun.nio.ch.WindowsSelectorImpl)
- locked <0x16df> (a java.util.Collections$UnmodifiableSet)
- locked <0x16e0> (a sun.nio.ch.Util$3)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:101)
at
org.eclipse.jetty.io.ManagedSelector$SelectorProducer.select(ManagedSelector.java:234)
at
org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:187)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:211)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:126)
at
org.eclipse.jetty.io.ManagedSelector$$Lambda$10.1688310330.run(Unknown
Source:-1)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:672)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:590)
at java.lang.Thread.run(Thread.java:748)
"qtp593573025-53@5559" prio=5 tid=0x35 nid=NA runnable
java.lang.Thread.State: RUNNABLE
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(WindowsSelectorImpl.java:-1)
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.java:296)
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(WindowsSelectorImpl.java:278)
at
sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:159)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x16e1> (a sun.nio.ch.WindowsSelectorImpl)
- locked <0x16e2> (a java.util.Collections$UnmodifiableSet)
- locked <0x16e3> (a sun.nio.ch.Util$3)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:101)
at
org.eclipse.jetty.io.ManagedSelector$SelectorProducer.select(ManagedSelector.java:234)
at
org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:187)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:211)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:126)
at
org.eclipse.jetty.io.ManagedSelector$$Lambda$10.1688310330.run(Unknown
Source:-1)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:672)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:590)
at java.lang.Thread.run(Thread.java:748)
"Executing
randomTest(com.michelin.cio.hudson.plugins.rolestrategy.RandomTest)@1" prio=5
tid=0x1 nid=NA runnable
java.lang.Thread.State: RUNNABLE
at org.jvnet.hudson.test.JenkinsRule.after(JenkinsRule.java:517)
at org.jvnet.hudson.test.JenkinsRule$1.evaluate(JenkinsRule.java:572)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at
com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at
com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at
com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at
com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
"Scheduler-543409470@5568" prio=5 tid=0x3d nid=NA waiting
java.lang.Thread.State: WAITING
at sun.misc.Unsafe.park(Unsafe.java:-1)
at
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
at
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
at
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
at
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
"qtp593573025-57-acceptor-0@40ee4467-ServerConnector@4e29b20a{HTTP/1.1,[http/1.1]}{0.0.0.0:50577}@5563"
prio=3 tid=0x39 nid=NA runnable
java.lang.Thread.State: RUNNABLE
at
sun.nio.ch.ServerSocketChannelImpl.accept0(ServerSocketChannelImpl.java:-1)
at
sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:422)
at
sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:250)
- locked <0x16d7> (a java.lang.Object)
at
org.eclipse.jetty.server.ServerConnector.accept(ServerConnector.java:352)
at
org.eclipse.jetty.server.AbstractConnector$Acceptor.run(AbstractConnector.java:603)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:672)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:590)
at java.lang.Thread.run(Thread.java:748)
"Computer.threadPoolForRemoting [#1]@5522" daemon prio=5 tid=0x34 nid=NA waiting
java.lang.Thread.State: WAITING
at sun.misc.Unsafe.park(Unsafe.java:-1)
at
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at
java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:460)
at
java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:362)
at
java.util.concurrent.SynchronousQueue.poll(SynchronousQueue.java:941)
at
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
"qtp593573025-60@5566" prio=5 tid=0x3c nid=NA waiting
java.lang.Thread.State: WAITING
at sun.misc.Unsafe.park(Unsafe.java:-1)
at
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
at
org.eclipse.jetty.util.BlockingArrayQueue.poll(BlockingArrayQueue.java:392)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.idleJobPoll(QueuedThreadPool.java:564)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.access$800(QueuedThreadPool.java:49)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:627)
at java.lang.Thread.run(Thread.java:748)
"qtp593573025-59@5565" prio=5 tid=0x3b nid=NA waiting
java.lang.Thread.State: WAITING
at sun.misc.Unsafe.park(Unsafe.java:-1)
at
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
at
org.eclipse.jetty.util.BlockingArrayQueue.poll(BlockingArrayQueue.java:392)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.idleJobPoll(QueuedThreadPool.java:564)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.access$800(QueuedThreadPool.java:49)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:627)
at java.lang.Thread.run(Thread.java:748)
"qtp593573025-58@5564" prio=5 tid=0x3a nid=NA waiting
java.lang.Thread.State: WAITING
at sun.misc.Unsafe.park(Unsafe.java:-1)
at
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
at
org.eclipse.jetty.util.BlockingArrayQueue.poll(BlockingArrayQueue.java:392)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.idleJobPoll(QueuedThreadPool.java:564)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.access$800(QueuedThreadPool.java:49)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:627)
at java.lang.Thread.run(Thread.java:748)
"Finalizer@5845" daemon prio=8 tid=0x3 nid=NA waiting
java.lang.Thread.State: WAITING
at java.lang.Object.wait(Object.java:-1)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:165)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:216)
"Reference Handler@5846" daemon prio=10 tid=0x2 nid=NA waiting
java.lang.Thread.State: WAITING
at java.lang.Object.wait(Object.java:-1)
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)
"Attach Listener@5843" daemon prio=5 tid=0x5 nid=NA runnable
java.lang.Thread.State: RUNNABLE
"Signal Dispatcher@5844" daemon prio=9 tid=0x4 nid=NA runnable
java.lang.Thread.State: RUNNABLE
