Comments (8)
thurka
commented on August 20, 2024
I am not able to reproduce it. Where is 'heap dump contains virtual threads'?
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alexmenkov
commented on August 20, 2024
from visualvm.
alexmenkov
commented on August 20, 2024
I've attached sample hprof file which contains virtual threads
from visualvm.
thurka
commented on August 20, 2024
Thanks, I will take a look.
from visualvm.
thurka
commented on August 20, 2024
I fixed NPE. In attached heap dump I now see two entries for Virtual thread [#29]/runnable@ForkJoinPool-1-worker-1. The first is in the middle with stack trace and the second is the last without stack trace. This look strange to me. Can you confirm that the attached heap dump is correct?
"main" prio=5 tid=1 TIMED_WAITING
at java.lang.Thread.sleepNanos0(Native Method)
at java.lang.Thread.sleepNanos(Thread.java:491)
local variable: java.lang.Thread#2
at java.lang.Thread.sleep(Thread.java:522)
at jdk.test.lib.apps.LingeredApp.main(LingeredApp.java:630)
local variable: java.lang.String[]#22
local variable: java.lang.String#2561
local variable: sun.nio.fs.WindowsPath#1
local variable: jdk.test.lib.apps.LingeredApp$SteadyStateLock#1
local variable: jdk.test.lib.apps.LingeredApp$SteadyStateLock#1
at MyTest2Targ.runTest(MyTest2.java:148)
local variable: MyTest2Targ#1
local variable: java.lang.String[]#22
local variable: MyTest2Targ$VthreadMounted#1
local variable: MyTest2Targ$Pthread#1
at MyTest2Targ.main(MyTest2.java:159)
local variable: java.lang.String[]#22
local variable: MyTest2Targ#1
"Reference Handler" daemon prio=10 tid=9 RUNNABLE
at java.lang.ref.Reference.waitForReferencePendingList(Native Method)
at java.lang.ref.Reference.processPendingReferences(Reference.java:246)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:208)
local variable: java.lang.ref.Reference$ReferenceHandler#1
"Finalizer" daemon prio=8 tid=10 WAITING
at java.lang.Object.wait0(Native Method)
at java.lang.Object.wait(Object.java:375)
local variable: java.lang.ref.NativeReferenceQueue$Lock#1
at java.lang.Object.wait(Object.java:348)
local variable: java.lang.ref.NativeReferenceQueue$Lock#1
at java.lang.ref.NativeReferenceQueue.await(NativeReferenceQueue.java:48)
local variable: java.lang.ref.NativeReferenceQueue#1
at java.lang.ref.ReferenceQueue.remove0(ReferenceQueue.java:158)
local variable: java.lang.ref.NativeReferenceQueue#1
at java.lang.ref.NativeReferenceQueue.remove(NativeReferenceQueue.java:89)
local variable: java.lang.ref.NativeReferenceQueue#1
local variable: java.lang.ref.NativeReferenceQueue$Lock#1
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:173)
local variable: java.lang.ref.Finalizer$FinalizerThread#1
local variable: java.lang.System$2#1
"Signal Dispatcher" daemon prio=9 tid=11 RUNNABLE
"Attach Listener" daemon prio=5 tid=12 RUNNABLE
"Notification Thread" daemon prio=9 tid=19 RUNNABLE
"Common-Cleaner" daemon prio=8 tid=20 TIMED_WAITING
at jdk.internal.misc.Unsafe.park(Native Method)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:269)
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject#6
local variable: jdk.internal.misc.InnocuousThread#1
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1847)
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject#6
local variable: java.util.concurrent.TimeUnit#3
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode#1
at java.lang.ref.ReferenceQueue.await(ReferenceQueue.java:71)
local variable: java.lang.ref.ReferenceQueue#4
at java.lang.ref.ReferenceQueue.remove0(ReferenceQueue.java:143)
local variable: java.lang.ref.ReferenceQueue#4
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:218)
local variable: java.lang.ref.ReferenceQueue#4
at jdk.internal.ref.CleanerImpl.run(CleanerImpl.java:140)
local variable: jdk.internal.ref.CleanerImpl#1
local variable: jdk.internal.misc.InnocuousThread#1
local variable: jdk.internal.misc.InnocuousThread#1
at java.lang.Thread.runWith(Thread.java:1583)
local variable: jdk.internal.misc.InnocuousThread#1
local variable: class java.lang.Thread
local variable: jdk.internal.ref.CleanerImpl#1
at java.lang.Thread.run(Thread.java:1570)
local variable: jdk.internal.misc.InnocuousThread#1
local variable: jdk.internal.ref.CleanerImpl#1
local variable: class java.lang.Thread
at jdk.internal.misc.InnocuousThread.run(InnocuousThread.java:186)
local variable: jdk.internal.misc.InnocuousThread#1
Virtual Thread [#29]/runnable@ForkJoinPool-1-worker-1
at MyTest2Targ$VthreadMounted.run(MyTest2.java:99)
local variable: MyTest2Targ$VthreadMounted#1
local variable: MyTest2Targ$VThreadMountedReferenced#1
at java.lang.Thread.runWith(Thread.java:1583)
local variable: java.lang.VirtualThread#6
local variable: class java.lang.Thread
local variable: MyTest2Targ$VthreadMounted#1
at java.lang.VirtualThread.run(VirtualThread.java:321)
local variable: java.lang.VirtualThread#6
local variable: MyTest2Targ$VthreadMounted#1
local variable: class java.lang.Thread
at java.lang.VirtualThread$VThreadContinuation$1.run(VirtualThread.java:201)
local variable: java.lang.VirtualThread$VThreadContinuation$1#6
at jdk.internal.vm.Continuation.enter0(Continuation.java:320)
local variable: java.lang.VirtualThread$VThreadContinuation#6
at jdk.internal.vm.Continuation.enter(Continuation.java:312)
local variable: java.lang.VirtualThread$VThreadContinuation#6
"ForkJoinPool-1-worker-1" daemon prio=5 tid=22 RUNNABLE
at jdk.internal.vm.Continuation.run(Continuation.java:248)
local variable: java.lang.VirtualThread$VThreadContinuation#6
local variable: jdk.internal.misc.CarrierThread#1
at java.lang.VirtualThread.runContinuation(VirtualThread.java:237)
local variable: java.lang.VirtualThread#6
at java.lang.VirtualThread$$Lambda+0x00000248a6057a28.run(<unresolved string 0x0>)
local variable: java.lang.VirtualThread$$Lambda+0x00000248a6057a28#6
at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.compute(ForkJoinTask.java:1726)
local variable: java.util.concurrent.ForkJoinTask$RunnableExecuteAction#1
at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.compute(ForkJoinTask.java:1717)
local variable: java.util.concurrent.ForkJoinTask$RunnableExecuteAction#1
at java.util.concurrent.ForkJoinTask$InterruptibleTask.exec(ForkJoinTask.java:1641)
local variable: java.util.concurrent.ForkJoinTask$RunnableExecuteAction#1
local variable: jdk.internal.misc.CarrierThread#1
local variable: java.util.concurrent.ForkJoinTask$RunnableExecuteAction#1
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:507)
local variable: java.util.concurrent.ForkJoinTask$RunnableExecuteAction#1
at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1491)
local variable: java.util.concurrent.ForkJoinPool$WorkQueue#2
local variable: java.util.concurrent.ForkJoinTask$RunnableExecuteAction#1
local variable: java.util.concurrent.ForkJoinPool$WorkQueue#1
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:2073)
local variable: java.util.concurrent.ForkJoinPool#2
local variable: java.util.concurrent.ForkJoinPool$WorkQueue#2
local variable: java.util.concurrent.ForkJoinPool$WorkQueue[]#2
local variable: java.util.concurrent.ForkJoinPool$WorkQueue#1
local variable: java.util.concurrent.ForkJoinTask[]#1
local variable: java.util.concurrent.ForkJoinTask$RunnableExecuteAction#1
local variable: java.util.concurrent.ForkJoinTask$RunnableExecuteAction#1
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2035)
local variable: java.util.concurrent.ForkJoinPool#2
local variable: java.util.concurrent.ForkJoinPool$WorkQueue#2
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187)
local variable: jdk.internal.misc.CarrierThread#1
local variable: java.util.concurrent.ForkJoinPool#2
local variable: java.util.concurrent.ForkJoinPool$WorkQueue#2
"ForkJoinPool-1-worker-2" daemon prio=5 tid=23 WAITING
at jdk.internal.misc.Unsafe.park(Native Method)
at java.util.concurrent.ForkJoinPool.awaitWork(ForkJoinPool.java:2145)
local variable: java.util.concurrent.ForkJoinPool#2
local variable: java.util.concurrent.ForkJoinPool$WorkQueue#3
local variable: java.util.concurrent.ForkJoinPool$WorkQueue[]#2
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2036)
local variable: java.util.concurrent.ForkJoinPool#2
local variable: java.util.concurrent.ForkJoinPool$WorkQueue#3
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187)
local variable: jdk.internal.misc.CarrierThread#2
local variable: java.util.concurrent.ForkJoinPool#2
local variable: java.util.concurrent.ForkJoinPool$WorkQueue#3
"ForkJoinPool-1-worker-3" daemon prio=5 tid=24 WAITING
at jdk.internal.misc.Unsafe.park(Native Method)
at java.util.concurrent.ForkJoinPool.awaitWork(ForkJoinPool.java:2145)
local variable: java.util.concurrent.ForkJoinPool#2
local variable: java.util.concurrent.ForkJoinPool$WorkQueue#4
local variable: java.util.concurrent.ForkJoinPool$WorkQueue[]#2
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2036)
local variable: java.util.concurrent.ForkJoinPool#2
local variable: java.util.concurrent.ForkJoinPool$WorkQueue#4
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187)
local variable: jdk.internal.misc.CarrierThread#3
local variable: java.util.concurrent.ForkJoinPool#2
local variable: java.util.concurrent.ForkJoinPool$WorkQueue#4
"Thread-0" prio=5 tid=30 WAITING
at jdk.internal.misc.Unsafe.park(Native Method)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:221)
local variable: java.util.concurrent.CountDownLatch$Sync#1
local variable: java.lang.Thread#1
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:754)
local variable: java.util.concurrent.CountDownLatch$Sync#1
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#6
local variable: java.lang.Thread#1
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#5
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#6
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1099)
local variable: java.util.concurrent.CountDownLatch$Sync#1
at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:230)
local variable: java.util.concurrent.CountDownLatch#1
at MyTest2Targ.awaitToStop(MyTest2.java:121)
local variable: MyTest2Targ#1
at MyTest2Targ$Pthread.run(MyTest2.java:111)
local variable: MyTest2Targ$Pthread#1
local variable: MyTest2Targ$PThreadReferenced#1
at java.lang.Thread.runWith(Thread.java:1583)
local variable: java.lang.Thread#1
local variable: class java.lang.Thread
local variable: MyTest2Targ$Pthread#1
at java.lang.Thread.run(Thread.java:1570)
local variable: java.lang.Thread#1
local variable: MyTest2Targ$Pthread#1
local variable: class java.lang.Thread
"SteadyStateThread" prio=5 tid=31 BLOCKED
at jdk.test.lib.apps.LingeredApp.steadyState(LingeredApp.java:567)
local variable: jdk.test.lib.apps.LingeredApp$SteadyStateLock#1
local variable: jdk.test.lib.apps.LingeredApp$SteadyStateLock#1
at jdk.test.lib.apps.LingeredApp$1.run(LingeredApp.java:573)
local variable: jdk.test.lib.apps.LingeredApp$1#1
Virtual Thread [#21]/parking
at jdk.internal.vm.Continuation.yield0(Continuation.java:360)
local variable: java.lang.VirtualThread$VThreadContinuation#1
local variable: jdk.internal.vm.ContinuationScope#1
at jdk.internal.vm.Continuation.yield(Continuation.java:351)
local variable: jdk.internal.vm.ContinuationScope#1
local variable: java.lang.VirtualThread$VThreadContinuation#1
local variable: java.lang.VirtualThread$VThreadContinuation#1
at java.lang.VirtualThread.yieldContinuation(VirtualThread.java:441)
local variable: java.lang.VirtualThread#1
at java.lang.VirtualThread.park(VirtualThread.java:588)
local variable: java.lang.VirtualThread#1
at java.lang.System$2.parkVirtualThread(System.java:2643)
local variable: java.lang.System$2#1
local variable: java.lang.VirtualThread#1
local variable: java.lang.VirtualThread#1
at jdk.internal.misc.VirtualThreads.park(VirtualThreads.java:54)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:219)
local variable: java.util.concurrent.CountDownLatch$Sync#1
local variable: java.lang.VirtualThread#1
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:754)
local variable: java.util.concurrent.CountDownLatch$Sync#1
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#1
local variable: java.lang.VirtualThread#1
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$ExclusiveNode#1
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#1
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1099)
local variable: java.util.concurrent.CountDownLatch$Sync#1
at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:230)
local variable: java.util.concurrent.CountDownLatch#1
at MyTest2Targ.awaitToStop(MyTest2.java:121)
local variable: MyTest2Targ#1
at MyTest2Targ$VthreadUnmounted.run(MyTest2.java:86)
local variable: MyTest2Targ$VthreadUnmounted#1
local variable: MyTest2Targ$VThreadUnmountedReferenced#1
at java.lang.Thread.runWith(Thread.java:1583)
local variable: java.lang.VirtualThread#1
local variable: class java.lang.Thread
local variable: MyTest2Targ$VthreadUnmounted#1
at java.lang.VirtualThread.run(VirtualThread.java:321)
local variable: java.lang.VirtualThread#1
local variable: MyTest2Targ$VthreadUnmounted#1
local variable: class java.lang.Thread
at java.lang.VirtualThread$VThreadContinuation$1.run(VirtualThread.java:201)
local variable: java.lang.VirtualThread$VThreadContinuation$1#1
at jdk.internal.vm.Continuation.enter0(Continuation.java:320)
local variable: java.lang.VirtualThread$VThreadContinuation#1
at jdk.internal.vm.Continuation.enter(Continuation.java:312)
local variable: java.lang.VirtualThread$VThreadContinuation#1
Virtual Thread [#25]/parking
at jdk.internal.vm.Continuation.yield0(Continuation.java:360)
local variable: java.lang.VirtualThread$VThreadContinuation#2
local variable: jdk.internal.vm.ContinuationScope#1
at jdk.internal.vm.Continuation.yield(Continuation.java:351)
local variable: jdk.internal.vm.ContinuationScope#1
local variable: java.lang.VirtualThread$VThreadContinuation#2
local variable: java.lang.VirtualThread$VThreadContinuation#2
at java.lang.VirtualThread.yieldContinuation(VirtualThread.java:441)
local variable: java.lang.VirtualThread#2
at java.lang.VirtualThread.park(VirtualThread.java:588)
local variable: java.lang.VirtualThread#2
at java.lang.System$2.parkVirtualThread(System.java:2643)
local variable: java.lang.System$2#1
local variable: java.lang.VirtualThread#2
local variable: java.lang.VirtualThread#2
at jdk.internal.misc.VirtualThreads.park(VirtualThreads.java:54)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:219)
local variable: java.util.concurrent.CountDownLatch$Sync#1
local variable: java.lang.VirtualThread#2
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:754)
local variable: java.util.concurrent.CountDownLatch$Sync#1
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#2
local variable: java.lang.VirtualThread#2
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#1
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#2
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1099)
local variable: java.util.concurrent.CountDownLatch$Sync#1
at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:230)
local variable: java.util.concurrent.CountDownLatch#1
at MyTest2Targ.awaitToStop(MyTest2.java:121)
local variable: MyTest2Targ#1
at MyTest2Targ$VthreadUnmounted.run(MyTest2.java:86)
local variable: MyTest2Targ$VthreadUnmounted#2
local variable: MyTest2Targ$VThreadUnmountedReferenced#2
at java.lang.Thread.runWith(Thread.java:1583)
local variable: java.lang.VirtualThread#2
local variable: class java.lang.Thread
local variable: MyTest2Targ$VthreadUnmounted#2
at java.lang.VirtualThread.run(VirtualThread.java:321)
local variable: java.lang.VirtualThread#2
local variable: MyTest2Targ$VthreadUnmounted#2
local variable: class java.lang.Thread
at java.lang.VirtualThread$VThreadContinuation$1.run(VirtualThread.java:201)
local variable: java.lang.VirtualThread$VThreadContinuation$1#2
at jdk.internal.vm.Continuation.enter0(Continuation.java:320)
local variable: java.lang.VirtualThread$VThreadContinuation#2
at jdk.internal.vm.Continuation.enter(Continuation.java:312)
local variable: java.lang.VirtualThread$VThreadContinuation#2
Virtual Thread [#26]/parking
at jdk.internal.vm.Continuation.yield0(Continuation.java:360)
local variable: java.lang.VirtualThread$VThreadContinuation#3
local variable: jdk.internal.vm.ContinuationScope#1
at jdk.internal.vm.Continuation.yield(Continuation.java:351)
local variable: jdk.internal.vm.ContinuationScope#1
local variable: java.lang.VirtualThread$VThreadContinuation#3
local variable: java.lang.VirtualThread$VThreadContinuation#3
at java.lang.VirtualThread.yieldContinuation(VirtualThread.java:441)
local variable: java.lang.VirtualThread#3
at java.lang.VirtualThread.park(VirtualThread.java:588)
local variable: java.lang.VirtualThread#3
at java.lang.System$2.parkVirtualThread(System.java:2643)
local variable: java.lang.System$2#1
local variable: java.lang.VirtualThread#3
local variable: java.lang.VirtualThread#3
at jdk.internal.misc.VirtualThreads.park(VirtualThreads.java:54)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:219)
local variable: java.util.concurrent.CountDownLatch$Sync#1
local variable: java.lang.VirtualThread#3
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:754)
local variable: java.util.concurrent.CountDownLatch$Sync#1
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#3
local variable: java.lang.VirtualThread#3
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#2
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#3
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1099)
local variable: java.util.concurrent.CountDownLatch$Sync#1
at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:230)
local variable: java.util.concurrent.CountDownLatch#1
at MyTest2Targ.awaitToStop(MyTest2.java:121)
local variable: MyTest2Targ#1
at MyTest2Targ$VthreadUnmounted.run(MyTest2.java:86)
local variable: MyTest2Targ$VthreadUnmounted#3
local variable: MyTest2Targ$VThreadUnmountedReferenced#3
at java.lang.Thread.runWith(Thread.java:1583)
local variable: java.lang.VirtualThread#3
local variable: class java.lang.Thread
local variable: MyTest2Targ$VthreadUnmounted#3
at java.lang.VirtualThread.run(VirtualThread.java:321)
local variable: java.lang.VirtualThread#3
local variable: MyTest2Targ$VthreadUnmounted#3
local variable: class java.lang.Thread
at java.lang.VirtualThread$VThreadContinuation$1.run(VirtualThread.java:201)
local variable: java.lang.VirtualThread$VThreadContinuation$1#3
at jdk.internal.vm.Continuation.enter0(Continuation.java:320)
local variable: java.lang.VirtualThread$VThreadContinuation#3
at jdk.internal.vm.Continuation.enter(Continuation.java:312)
local variable: java.lang.VirtualThread$VThreadContinuation#3
Virtual Thread [#27]/parking
at jdk.internal.vm.Continuation.yield0(Continuation.java:360)
local variable: java.lang.VirtualThread$VThreadContinuation#4
local variable: jdk.internal.vm.ContinuationScope#1
at jdk.internal.vm.Continuation.yield(Continuation.java:351)
local variable: jdk.internal.vm.ContinuationScope#1
local variable: java.lang.VirtualThread$VThreadContinuation#4
local variable: java.lang.VirtualThread$VThreadContinuation#4
at java.lang.VirtualThread.yieldContinuation(VirtualThread.java:441)
local variable: java.lang.VirtualThread#4
at java.lang.VirtualThread.park(VirtualThread.java:588)
local variable: java.lang.VirtualThread#4
at java.lang.System$2.parkVirtualThread(System.java:2643)
local variable: java.lang.System$2#1
local variable: java.lang.VirtualThread#4
local variable: java.lang.VirtualThread#4
at jdk.internal.misc.VirtualThreads.park(VirtualThreads.java:54)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:219)
local variable: java.util.concurrent.CountDownLatch$Sync#1
local variable: java.lang.VirtualThread#4
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:754)
local variable: java.util.concurrent.CountDownLatch$Sync#1
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#4
local variable: java.lang.VirtualThread#4
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#3
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#4
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1099)
local variable: java.util.concurrent.CountDownLatch$Sync#1
at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:230)
local variable: java.util.concurrent.CountDownLatch#1
at MyTest2Targ.awaitToStop(MyTest2.java:121)
local variable: MyTest2Targ#1
at MyTest2Targ$VthreadUnmounted.run(MyTest2.java:86)
local variable: MyTest2Targ$VthreadUnmounted#4
local variable: MyTest2Targ$VThreadUnmountedReferenced#4
at java.lang.Thread.runWith(Thread.java:1583)
local variable: java.lang.VirtualThread#4
local variable: class java.lang.Thread
local variable: MyTest2Targ$VthreadUnmounted#4
at java.lang.VirtualThread.run(VirtualThread.java:321)
local variable: java.lang.VirtualThread#4
local variable: MyTest2Targ$VthreadUnmounted#4
local variable: class java.lang.Thread
at java.lang.VirtualThread$VThreadContinuation$1.run(VirtualThread.java:201)
local variable: java.lang.VirtualThread$VThreadContinuation$1#4
at jdk.internal.vm.Continuation.enter0(Continuation.java:320)
local variable: java.lang.VirtualThread$VThreadContinuation#4
at jdk.internal.vm.Continuation.enter(Continuation.java:312)
local variable: java.lang.VirtualThread$VThreadContinuation#4
Virtual Thread [#28]/parking
at jdk.internal.vm.Continuation.yield0(Continuation.java:360)
local variable: java.lang.VirtualThread$VThreadContinuation#5
local variable: jdk.internal.vm.ContinuationScope#1
at jdk.internal.vm.Continuation.yield(Continuation.java:351)
local variable: jdk.internal.vm.ContinuationScope#1
local variable: java.lang.VirtualThread$VThreadContinuation#5
local variable: java.lang.VirtualThread$VThreadContinuation#5
at java.lang.VirtualThread.yieldContinuation(VirtualThread.java:441)
local variable: java.lang.VirtualThread#5
at java.lang.VirtualThread.park(VirtualThread.java:588)
local variable: java.lang.VirtualThread#5
at java.lang.System$2.parkVirtualThread(System.java:2643)
local variable: java.lang.System$2#1
local variable: java.lang.VirtualThread#5
local variable: java.lang.VirtualThread#5
at jdk.internal.misc.VirtualThreads.park(VirtualThreads.java:54)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:219)
local variable: java.util.concurrent.CountDownLatch$Sync#1
local variable: java.lang.VirtualThread#5
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:754)
local variable: java.util.concurrent.CountDownLatch$Sync#1
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#5
local variable: java.lang.VirtualThread#5
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#4
local variable: java.util.concurrent.locks.AbstractQueuedSynchronizer$SharedNode#5
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1099)
local variable: java.util.concurrent.CountDownLatch$Sync#1
at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:230)
local variable: java.util.concurrent.CountDownLatch#1
at MyTest2Targ.awaitToStop(MyTest2.java:121)
local variable: MyTest2Targ#1
at MyTest2Targ$VthreadUnmounted.run(MyTest2.java:86)
local variable: MyTest2Targ$VthreadUnmounted#5
local variable: MyTest2Targ$VThreadUnmountedReferenced#5
at java.lang.Thread.runWith(Thread.java:1583)
local variable: java.lang.VirtualThread#5
local variable: class java.lang.Thread
local variable: MyTest2Targ$VthreadUnmounted#5
at java.lang.VirtualThread.run(VirtualThread.java:321)
local variable: java.lang.VirtualThread#5
local variable: MyTest2Targ$VthreadUnmounted#5
local variable: class java.lang.Thread
at java.lang.VirtualThread$VThreadContinuation$1.run(VirtualThread.java:201)
local variable: java.lang.VirtualThread$VThreadContinuation$1#5
at jdk.internal.vm.Continuation.enter0(Continuation.java:320)
local variable: java.lang.VirtualThread$VThreadContinuation#5
at jdk.internal.vm.Continuation.enter(Continuation.java:312)
local variable: java.lang.VirtualThread$VThreadContinuation#5
Virtual Thread [#29]/runnable@ForkJoinPool-1-worker-1
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alexmenkov
commented on August 20, 2024
@thurka The thread dump looks good.
Duplicate of the Virtual thread [#29] is bug in the JDK heap dumper. Will fix it.
from visualvm.
thurka
commented on August 20, 2024
Will fix it.
Great.
I want to separate normal and virual threads in threads view (or create separate virtual threads view).
from visualvm.
thurka
commented on August 20, 2024
NPE fixed in master.
from visualvm.
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