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https://issues.apache.org/jira/browse/SUREFIRE-1430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16854987#comment-16854987
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Vladimir Sitnikov commented on SUREFIRE-1430:
---------------------------------------------
Just in case, here's a thread dump of the failure case.
It looks like maven-surefire creates a Semaphore with capacity of 1, and:
1) main thread acquires a permit just before {{at
org.apache.maven.surefire.junitcore.pc.Scheduler.schedule(Scheduler.java:346)}}
2) pool-1-thread-1 tries to acquire another permit {{at
org.apache.maven.surefire.junitcore.pc.Scheduler.schedule(Scheduler.java:342)}
It looks like "main thread" is executing "a suite" while "pool-1-thread-1" is
executing tests.
I don't want to make quick judgements, however it looks like "suite executor"
should not acquire permits in case its only purpose is to delegate work to a
worker pool.
{noformat}
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.151-b12 mixed mode):
"pool-1-thread-1" #8 prio=5 os_prio=0 tid=0x00007f4f40326000 nid=0x12e5 waiting
on condition [0x00007f4f29c33000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000e06102e0> (a
java.util.concurrent.Semaphore$FairSync)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
at java.util.concurrent.Semaphore.acquire(Semaphore.java:312)
at
org.apache.maven.surefire.junitcore.pc.ThreadResourcesBalancer.acquirePermit(ThreadResourcesBalancer.java:75)
at
org.apache.maven.surefire.junitcore.pc.Scheduler.schedule(Scheduler.java:342)
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.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at
org.apache.maven.surefire.junitcore.pc.Scheduler$1.run(Scheduler.java:387)
at
java.util.concurrent.Executors$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$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
"Service Thread" #7 daemon prio=9 os_prio=0 tid=0x00007f4f40141000 nid=0x12e3
runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C1 CompilerThread1" #6 daemon prio=9 os_prio=0 tid=0x00007f4f4013e000
nid=0x12e2 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread0" #5 daemon prio=9 os_prio=0 tid=0x00007f4f4013b000
nid=0x12e1 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Signal Dispatcher" #4 daemon prio=9 os_prio=0 tid=0x00007f4f40139800
nid=0x12e0 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007f4f40107000 nid=0x12df in
Object.wait() [0x00007f4f2ae4f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000e0008ec8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
- locked <0x00000000e0008ec8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)
"Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007f4f40102800
nid=0x12de in Object.wait() [0x00007f4f2af50000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000e0006b68> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
- locked <0x00000000e0006b68> (a java.lang.ref.Reference$Lock)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)
{noformat}
main thread:
{noformat}
"main" #1 prio=5 os_prio=0 tid=0x00007f4f40009800 nid=0x12da waiting on
condition [0x00007f4f4617d000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000e0657bf8> (a
java.util.concurrent.FutureTask)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.FutureTask.awaitDone(FutureTask.java:429)
at java.util.concurrent.FutureTask.get(FutureTask.java:191)
at
org.apache.maven.surefire.junitcore.pc.SharedThreadPoolStrategy.finished(SharedThreadPoolStrategy.java:60)
at
org.apache.maven.surefire.junitcore.pc.Scheduler.finished(Scheduler.java:366)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:295)
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.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at
org.apache.maven.surefire.junitcore.pc.Scheduler$1.run(Scheduler.java:387)
at
org.apache.maven.surefire.junitcore.pc.InvokerStrategy.schedule(InvokerStrategy.java:54)
at
org.apache.maven.surefire.junitcore.pc.Scheduler.schedule(Scheduler.java:346)
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.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at
org.apache.maven.surefire.junitcore.pc.Scheduler$1.run(Scheduler.java:387)
at
org.apache.maven.surefire.junitcore.pc.InvokerStrategy.schedule(InvokerStrategy.java:54)
at
org.apache.maven.surefire.junitcore.pc.Scheduler.schedule(Scheduler.java:346)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at
org.apache.maven.surefire.junitcore.pc.ParallelComputerBuilder$PC$1.run(ParallelComputerBuilder.java:535)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
at
org.apache.maven.surefire.junitcore.JUnitCoreWrapper.createRequestAndRun(JUnitCoreWrapper.java:108)
at
org.apache.maven.surefire.junitcore.JUnitCoreWrapper.executeEager(JUnitCoreWrapper.java:78)
at
org.apache.maven.surefire.junitcore.JUnitCoreWrapper.execute(JUnitCoreWrapper.java:54)
at
org.apache.maven.surefire.junitcore.JUnitCoreProvider.invoke(JUnitCoreProvider.java:144)
at
org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:203)
at
org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:155)
at
org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103)
{noformat}
> Parallel parameterized JUnit test hangs on Linux
> ------------------------------------------------
>
> Key: SUREFIRE-1430
> URL: https://issues.apache.org/jira/browse/SUREFIRE-1430
> Project: Maven Surefire
> Issue Type: Bug
> Components: Junit 4.7+ (parallel) support
> Affects Versions: 2.18, 2.18.1, 2.19, 2.19.1, 2.20, 2.20.1
> Environment: Linux/Ubuntu
> Reporter: Christian Beikov
> Assignee: Tibor Digana
> Priority: Major
> Fix For: 3.0.1
>
>
> This is a follow up of SUREFIRE-1264. The test case is here:
> https://github.com/beikov/surefire-test
> The problem is, that a simple parameterized JUnit test hangs when running in
> parallel mode on Linux.
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