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deadlock in language server process avoids process to be shutdown

See original GitHub issue

Today I came across the situation that a number of Spring Boot Language Server process kept running on my machine, even though I shutdown VSCode. I tried to kill them all, but some of them refused to terminate. Running jstack on them revealed that the process is hanging in a deadlock and therefore isn’t able to terminate in a regular way.

2022-03-01 12:31:38
Full thread dump Java HotSpot(TM) 64-Bit Server VM (11.0.10+8-LTS-162 mixed mode):

Threads class SMR info:
_java_thread_list=0x00006000029e9080, length=18, elements={
0x00007fe8e2022000, 0x00007fe8e2025000, 0x00007fe8b2008800, 0x00007fe8b200b800,
0x00007fe8e3a60000, 0x00007fe8e405b800, 0x00007fe8e3a80000, 0x00007fe8e1877000,
0x00007fe8e200b800, 0x00007fe8e4305800, 0x00007fe8e433a000, 0x00007fe8e3bda800,
0x00007fe8e3c92800, 0x00007fe8e3c7d000, 0x00007fe8e21d9800, 0x00007fe8e4300000,
0x00007fe8e2193000, 0x00007fe8e2173000
}

"Reference Handler" #2 daemon prio=10 os_prio=31 cpu=1.61ms elapsed=600369.96s tid=0x00007fe8e2022000 nid=0x4403 waiting on condition  [0x000070000be59000]
   java.lang.Thread.State: RUNNABLE
	at java.lang.ref.Reference.waitForReferencePendingList(java.base@11.0.10/Native Method)
	at java.lang.ref.Reference.processPendingReferences(java.base@11.0.10/Reference.java:241)
	at java.lang.ref.Reference$ReferenceHandler.run(java.base@11.0.10/Reference.java:213)

"Finalizer" #3 daemon prio=8 os_prio=31 cpu=0.31ms elapsed=600369.96s tid=0x00007fe8e2025000 nid=0x3303 in Object.wait()  [0x000070000bf5c000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(java.base@11.0.10/Native Method)
	- waiting on <0x000000078006a4f0> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(java.base@11.0.10/ReferenceQueue.java:155)
	- waiting to re-lock in wait() <0x000000078006a4f0> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(java.base@11.0.10/ReferenceQueue.java:176)
	at java.lang.ref.Finalizer$FinalizerThread.run(java.base@11.0.10/Finalizer.java:170)

"Signal Dispatcher" #4 daemon prio=9 os_prio=31 cpu=34.26ms elapsed=600369.95s tid=0x00007fe8b2008800 nid=0x3d03 runnable  [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C1 CompilerThread0" #5 daemon prio=9 os_prio=31 cpu=1509.91ms elapsed=600369.95s tid=0x00007fe8b200b800 nid=0x5503 waiting on condition  [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE
   No compile task

"Sweeper thread" #17 daemon prio=9 os_prio=31 cpu=1.03ms elapsed=600369.95s tid=0x00007fe8e3a60000 nid=0xa703 runnable  [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Service Thread" #18 daemon prio=9 os_prio=31 cpu=0.04ms elapsed=600369.91s tid=0x00007fe8e405b800 nid=0x5803 runnable  [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Common-Cleaner" #19 daemon prio=8 os_prio=31 cpu=123.52ms elapsed=600369.90s tid=0x00007fe8e3a80000 nid=0xa503 in Object.wait()  [0x000070000c674000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
	at java.lang.Object.wait(java.base@11.0.10/Native Method)
	- waiting on <no object reference available>
	at java.lang.ref.ReferenceQueue.remove(java.base@11.0.10/ReferenceQueue.java:155)
	- waiting to re-lock in wait() <0x000000078006ba38> (a java.lang.ref.ReferenceQueue$Lock)
	at jdk.internal.ref.CleanerImpl.run(java.base@11.0.10/CleanerImpl.java:148)
	at java.lang.Thread.run(java.base@11.0.10/Thread.java:834)
	at jdk.internal.misc.InnocuousThread.run(java.base@11.0.10/InnocuousThread.java:134)

"DestroyJavaVM" #25 prio=5 os_prio=31 cpu=1339.30ms elapsed=600368.34s tid=0x00007fe8e1877000 nid=0x1703 waiting on condition  [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Simple-Language-Server main thread" #27 daemon prio=5 os_prio=31 cpu=4111.94ms elapsed=600368.22s tid=0x00007fe8e200b800 nid=0x8d03 waiting for monitor entry  [0x000070000d7a6000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at org.springframework.ide.vscode.commons.languageserver.java.FutureProjectFinder.resolvePendingRequests(FutureProjectFinder.java:73)
	- waiting to lock <0x00000007bc3277c8> (a org.springframework.ide.vscode.commons.languageserver.java.FutureProjectFinder)
	at org.springframework.ide.vscode.commons.languageserver.java.FutureProjectFinder$1.created(FutureProjectFinder.java:39)
	at org.springframework.ide.vscode.boot.jdt.ls.JdtLsProjectCache.notifyCreated(JdtLsProjectCache.java:124)
	- locked <0x00000007bc338180> (a java.util.ArrayList)
	at org.springframework.ide.vscode.boot.jdt.ls.JdtLsProjectCache$JstLsClasspathListener.lambda$changed$0(JdtLsProjectCache.java:357)
	- locked <0x00000007bc327670> (a java.util.HashMap)
	at org.springframework.ide.vscode.boot.jdt.ls.JdtLsProjectCache$JstLsClasspathListener$$Lambda$454/0x0000000800435840.run(Unknown Source)
	at reactor.core.publisher.MonoRunnable.call(MonoRunnable.java:73)
	at reactor.core.publisher.MonoRunnable.call(MonoRunnable.java:32)
	at reactor.core.publisher.MonoCallableOnAssembly.call(MonoCallableOnAssembly.java:90)
	at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:135)
	at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56)
	at reactor.core.publisher.Mono.subscribe(Mono.java:4213)
	at reactor.core.publisher.Mono.subscribeWith(Mono.java:4324)
	at reactor.core.publisher.Mono.toFuture(Mono.java:4658)
	at org.springframework.ide.vscode.commons.languageserver.util.SimpleLanguageServer.doOnInitialized(SimpleLanguageServer.java:759)
	at org.springframework.ide.vscode.boot.jdt.ls.JdtLsProjectCache$JstLsClasspathListener.changed(JdtLsProjectCache.java:330)
	at org.springframework.ide.vscode.commons.languageserver.java.ls.ClasspathListenerManager.lambda$addClasspathListener$0(ClasspathListenerManager.java:91)
	at org.springframework.ide.vscode.commons.languageserver.java.ls.ClasspathListenerManager$$Lambda$453/0x0000000800436440.call(Unknown Source)
	at reactor.core.publisher.MonoCallable.call(MonoCallable.java:91)
	at reactor.core.publisher.MonoCallableOnAssembly.call(MonoCallableOnAssembly.java:90)
	at reactor.core.publisher.FluxSubscribeOnCallable$CallableSubscribeOnSubscription.run(FluxSubscribeOnCallable.java:225)
	at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:68)
	at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:28)
	at java.util.concurrent.FutureTask.run(java.base@11.0.10/FutureTask.java:264)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(java.base@11.0.10/ScheduledThreadPoolExecutor.java:304)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@11.0.10/ThreadPoolExecutor.java:1128)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@11.0.10/ThreadPoolExecutor.java:628)
	at java.lang.Thread.run(java.base@11.0.10/Thread.java:834)

"Reconciler-1" #28 prio=5 os_prio=31 cpu=42.63ms elapsed=600368.20s tid=0x00007fe8e4305800 nid=0x8b03 waiting on condition  [0x000070000d8aa000]
   java.lang.Thread.State: WAITING (parking)
	at jdk.internal.misc.Unsafe.park(java.base@11.0.10/Native Method)
	- parking to wait for  <0x00000007bc341740> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(java.base@11.0.10/LockSupport.java:194)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@11.0.10/AbstractQueuedSynchronizer.java:2081)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@11.0.10/ScheduledThreadPoolExecutor.java:1170)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@11.0.10/ScheduledThreadPoolExecutor.java:899)
	at java.util.concurrent.ThreadPoolExecutor.getTask(java.base@11.0.10/ThreadPoolExecutor.java:1054)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@11.0.10/ThreadPoolExecutor.java:1114)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@11.0.10/ThreadPoolExecutor.java:628)
	at java.lang.Thread.run(java.base@11.0.10/Thread.java:834)

"parallel-1" #29 daemon prio=5 os_prio=31 cpu=0.39ms elapsed=600368.16s tid=0x00007fe8e433a000 nid=0x6b03 waiting on condition  [0x000070000d9ad000]
   java.lang.Thread.State: WAITING (parking)
	at jdk.internal.misc.Unsafe.park(java.base@11.0.10/Native Method)
	- parking to wait for  <0x00000007bc34e868> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(java.base@11.0.10/LockSupport.java:194)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@11.0.10/AbstractQueuedSynchronizer.java:2081)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@11.0.10/ScheduledThreadPoolExecutor.java:1170)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@11.0.10/ScheduledThreadPoolExecutor.java:899)
	at java.util.concurrent.ThreadPoolExecutor.getTask(java.base@11.0.10/ThreadPoolExecutor.java:1054)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@11.0.10/ThreadPoolExecutor.java:1114)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@11.0.10/ThreadPoolExecutor.java:628)
	at java.lang.Thread.run(java.base@11.0.10/Thread.java:834)

"ForkJoinPool.commonPool-worker-19" #30 daemon prio=5 os_prio=31 cpu=3817.43ms elapsed=600368.15s tid=0x00007fe8e3bda800 nid=0x6e03 waiting for monitor entry  [0x000070000dab0000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at org.springframework.ide.vscode.boot.jdt.ls.JdtLsProjectCache.find(JdtLsProjectCache.java:201)
	- waiting to lock <0x00000007bc327670> (a java.util.HashMap)
	at org.springframework.ide.vscode.commons.languageserver.java.FutureProjectFinder.findFuture(FutureProjectFinder.java:91)
	- locked <0x00000007bc3277c8> (a org.springframework.ide.vscode.commons.languageserver.java.FutureProjectFinder)
	at org.springframework.ide.vscode.boot.app.SpringSymbolIndex.getSymbols(SpringSymbolIndex.java:550)
	at org.springframework.ide.vscode.boot.java.handlers.BootJavaDocumentSymbolHandler.handle(BootJavaDocumentSymbolHandler.java:33)
	at org.springframework.ide.vscode.commons.languageserver.util.SimpleTextDocumentService.lambda$documentSymbol$9(SimpleTextDocumentService.java:395)
	at org.springframework.ide.vscode.commons.languageserver.util.SimpleTextDocumentService$$Lambda$442/0x0000000800432840.apply(Unknown Source)
	at java.util.concurrent.CompletableFuture$UniApply.tryFire(java.base@11.0.10/CompletableFuture.java:642)
	at java.util.concurrent.CompletableFuture$Completion.exec(java.base@11.0.10/CompletableFuture.java:479)
	at java.util.concurrent.ForkJoinTask.doExec(java.base@11.0.10/ForkJoinTask.java:290)
	at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(java.base@11.0.10/ForkJoinPool.java:1020)
	at java.util.concurrent.ForkJoinPool.scan(java.base@11.0.10/ForkJoinPool.java:1656)
	at java.util.concurrent.ForkJoinPool.runWorker(java.base@11.0.10/ForkJoinPool.java:1594)
	at java.util.concurrent.ForkJoinWorkerThread.run(java.base@11.0.10/ForkJoinWorkerThread.java:183)

"ForkJoinPool.commonPool-worker-5" #31 daemon prio=5 os_prio=31 cpu=2.83ms elapsed=600368.15s tid=0x00007fe8e3c92800 nid=0x8803 waiting for monitor entry  [0x000070000dbb3000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at org.springframework.ide.vscode.boot.jdt.ls.JdtLsProjectCache.find(JdtLsProjectCache.java:201)
	- waiting to lock <0x00000007bc327670> (a java.util.HashMap)
	at org.springframework.ide.vscode.boot.metadata.DefaultSpringPropertyIndexProvider.getIndex(DefaultSpringPropertyIndexProvider.java:45)
	at org.springframework.ide.vscode.boot.properties.hover.PropertiesHoverInfoProvider.getHoverInfo(PropertiesHoverInfoProvider.java:41)
	at org.springframework.ide.vscode.boot.properties.BootPropertiesLanguageServerComponents.lambda$getHoverProvider$5(BootPropertiesLanguageServerComponents.java:125)
	at org.springframework.ide.vscode.boot.properties.BootPropertiesLanguageServerComponents$$Lambda$491/0x00000008004a6840.getHoverInfo(Unknown Source)
	at org.springframework.ide.vscode.commons.languageserver.hover.VscodeHoverEngineAdapter.handle(VscodeHoverEngineAdapter.java:73)
	at org.springframework.ide.vscode.commons.languageserver.composable.CompositeLanguageServerComponents$2.handle(CompositeLanguageServerComponents.java:92)
	at org.springframework.ide.vscode.commons.languageserver.util.SimpleTextDocumentService.computeHover(SimpleTextDocumentService.java:313)
	at org.springframework.ide.vscode.commons.languageserver.util.SimpleTextDocumentService.lambda$hover$3(SimpleTextDocumentService.java:292)
	at org.springframework.ide.vscode.commons.languageserver.util.SimpleTextDocumentService$$Lambda$490/0x00000008004a7440.apply(Unknown Source)
	at java.util.concurrent.CompletableFuture$UniApply.tryFire(java.base@11.0.10/CompletableFuture.java:642)
	at java.util.concurrent.CompletableFuture$Completion.exec(java.base@11.0.10/CompletableFuture.java:479)
	at java.util.concurrent.ForkJoinTask.doExec(java.base@11.0.10/ForkJoinTask.java:290)
	at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(java.base@11.0.10/ForkJoinPool.java:1020)
	at java.util.concurrent.ForkJoinPool.scan(java.base@11.0.10/ForkJoinPool.java:1656)
	at java.util.concurrent.ForkJoinPool.runWorker(java.base@11.0.10/ForkJoinPool.java:1594)
	at java.util.concurrent.ForkJoinWorkerThread.run(java.base@11.0.10/ForkJoinWorkerThread.java:183)

"ForkJoinPool.commonPool-worker-23" #32 daemon prio=5 os_prio=31 cpu=0.13ms elapsed=600335.40s tid=0x00007fe8e3c7d000 nid=0x7003 waiting for monitor entry  [0x000070000dcb6000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at org.springframework.ide.vscode.commons.languageserver.java.FutureProjectFinder.findFuture(FutureProjectFinder.java:90)
	- waiting to lock <0x00000007bc3277c8> (a org.springframework.ide.vscode.commons.languageserver.java.FutureProjectFinder)
	at org.springframework.ide.vscode.boot.app.SpringSymbolIndex.getSymbols(SpringSymbolIndex.java:550)
	at org.springframework.ide.vscode.boot.java.handlers.BootJavaDocumentSymbolHandler.handle(BootJavaDocumentSymbolHandler.java:33)
	at org.springframework.ide.vscode.commons.languageserver.util.SimpleTextDocumentService.lambda$documentSymbol$9(SimpleTextDocumentService.java:395)
	at org.springframework.ide.vscode.commons.languageserver.util.SimpleTextDocumentService$$Lambda$442/0x0000000800432840.apply(Unknown Source)
	at java.util.concurrent.CompletableFuture$UniApply.tryFire(java.base@11.0.10/CompletableFuture.java:642)
	at java.util.concurrent.CompletableFuture$Completion.exec(java.base@11.0.10/CompletableFuture.java:479)
	at java.util.concurrent.ForkJoinTask.doExec(java.base@11.0.10/ForkJoinTask.java:290)
	at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(java.base@11.0.10/ForkJoinPool.java:1020)
	at java.util.concurrent.ForkJoinPool.scan(java.base@11.0.10/ForkJoinPool.java:1656)
	at java.util.concurrent.ForkJoinPool.runWorker(java.base@11.0.10/ForkJoinPool.java:1594)
	at java.util.concurrent.ForkJoinWorkerThread.run(java.base@11.0.10/ForkJoinWorkerThread.java:183)

"Attach Listener" #33 daemon prio=9 os_prio=31 cpu=149.11ms elapsed=600326.60s tid=0x00007fe8e21d9800 nid=0x660b waiting on condition  [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"SIGTERM handler" #34 daemon prio=9 os_prio=31 cpu=6.66ms elapsed=93.57s tid=0x00007fe8e4300000 nid=0x8f07 in Object.wait()  [0x000070000d6a4000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(java.base@11.0.10/Native Method)
	- waiting on <no object reference available>
	at java.lang.Thread.join(java.base@11.0.10/Thread.java:1305)
	- waiting to re-lock in wait() <0x00000007bbf02170> (a org.springframework.context.support.AbstractApplicationContext$1)
	at java.lang.Thread.join(java.base@11.0.10/Thread.java:1379)
	at java.lang.ApplicationShutdownHooks.runHooks(java.base@11.0.10/ApplicationShutdownHooks.java:107)
	at java.lang.ApplicationShutdownHooks$1.run(java.base@11.0.10/ApplicationShutdownHooks.java:46)
	at java.lang.Shutdown.runHooks(java.base@11.0.10/Shutdown.java:130)
	at java.lang.Shutdown.exit(java.base@11.0.10/Shutdown.java:174)
	- locked <0x00000007800b8408> (a java.lang.Class for java.lang.Shutdown)
	at java.lang.Terminator$1.handle(java.base@11.0.10/Terminator.java:51)
	at jdk.internal.misc.Signal$1.run(java.base@11.0.10/Signal.java:220)
	at java.lang.Thread.run(java.base@11.0.10/Thread.java:834)

"SpringContextShutdownHook" #22 prio=5 os_prio=31 cpu=59.39ms elapsed=93.53s tid=0x00007fe8e2193000 nid=0x8303 waiting for monitor entry  [0x000070000debc000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at org.springframework.ide.vscode.boot.jdt.ls.JdtLsProjectCache.removeListener(JdtLsProjectCache.java:111)
	- waiting to lock <0x00000007bc338180> (a java.util.ArrayList)
	at org.springframework.ide.vscode.commons.languageserver.java.FutureProjectFinder.destroy(FutureProjectFinder.java:85)
	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:258)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:587)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:559)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:1092)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:520)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:1085)
	at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1061)
	at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1030)
	at org.springframework.context.support.AbstractApplicationContext$1.run(AbstractApplicationContext.java:949)
	- locked <0x0000000780066d20> (a java.lang.Object)

"SIGTERM handler" #35 daemon prio=9 os_prio=31 cpu=2.43ms elapsed=69.46s tid=0x00007fe8e2173000 nid=0x8407 waiting for monitor entry  [0x000070000ddb9000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at java.lang.Shutdown.exit(java.base@11.0.10/Shutdown.java:173)
	- waiting to lock <0x00000007800b8408> (a java.lang.Class for java.lang.Shutdown)
	at java.lang.Terminator$1.handle(java.base@11.0.10/Terminator.java:51)
	at jdk.internal.misc.Signal$1.run(java.base@11.0.10/Signal.java:220)
	at java.lang.Thread.run(java.base@11.0.10/Thread.java:834)

"VM Thread" os_prio=31 cpu=3847.94ms elapsed=600369.97s tid=0x00007fe8e201a800 nid=0x4703 runnable  

"GC Thread#0" os_prio=31 cpu=25.00ms elapsed=600369.98s tid=0x00007fe8e3810800 nid=0x5203 runnable  

"GC Thread#1" os_prio=31 cpu=21.25ms elapsed=600369.05s tid=0x00007fe8e210c800 nid=0x5d07 runnable  

"GC Thread#2" os_prio=31 cpu=19.36ms elapsed=600369.05s tid=0x00007fe8e2101800 nid=0x5c07 runnable  

"GC Thread#3" os_prio=31 cpu=21.17ms elapsed=600369.05s tid=0x00007fe8e40be800 nid=0x5f03 runnable  

"GC Thread#4" os_prio=31 cpu=20.53ms elapsed=600369.05s tid=0x00007fe8e2157800 nid=0xa103 runnable  

"GC Thread#5" os_prio=31 cpu=20.53ms elapsed=600369.05s tid=0x00007fe8e2158800 nid=0x9f03 runnable  

"GC Thread#6" os_prio=31 cpu=21.53ms elapsed=600369.05s tid=0x00007fe8e424a000 nid=0x9d03 runnable  

"GC Thread#7" os_prio=31 cpu=20.55ms elapsed=600369.05s tid=0x00007fe8e4231800 nid=0x9b03 runnable  

"GC Thread#8" os_prio=31 cpu=18.98ms elapsed=600369.05s tid=0x00007fe8e428c800 nid=0x9903 runnable  

"GC Thread#9" os_prio=31 cpu=21.19ms elapsed=600369.05s tid=0x00007fe8e425c800 nid=0x9703 runnable  

"GC Thread#10" os_prio=31 cpu=21.38ms elapsed=600369.05s tid=0x00007fe8e429c000 nid=0x6003 runnable  

"GC Thread#11" os_prio=31 cpu=20.00ms elapsed=600369.05s tid=0x00007fe8e429c800 nid=0x9403 runnable  

"GC Thread#12" os_prio=31 cpu=19.76ms elapsed=600369.05s tid=0x00007fe8e4276000 nid=0x6203 runnable  

"G1 Main Marker" os_prio=31 cpu=0.61ms elapsed=600369.98s tid=0x00007fe8e3835800 nid=0x5003 runnable  

"G1 Conc#0" os_prio=31 cpu=18.57ms elapsed=600369.98s tid=0x00007fe8e3836800 nid=0x4d03 runnable  

"G1 Conc#1" os_prio=31 cpu=18.70ms elapsed=600368.96s tid=0x00007fe8e42b6000 nid=0x6403 runnable  

"G1 Conc#2" os_prio=31 cpu=18.06ms elapsed=600368.96s tid=0x00007fe8e42ba800 nid=0x9203 runnable  

"G1 Refine#0" os_prio=31 cpu=0.36ms elapsed=600369.98s tid=0x00007fe8e4821000 nid=0x4c03 runnable  

"G1 Young RemSet Sampling" os_prio=31 cpu=20512.03ms elapsed=600369.98s tid=0x00007fe8e2014800 nid=0x4b03 runnable  
"VM Periodic Task Thread" os_prio=31 cpu=74264.23ms elapsed=600369.91s tid=0x00007fe8e400f000 nid=0x5a03 waiting on condition  

JNI global refs: 23, weak refs: 0


Found one Java-level deadlock:
=============================
"Simple-Language-Server main thread":
  waiting to lock monitor 0x00007fe8b800de00 (object 0x00000007bc3277c8, a org.springframework.ide.vscode.commons.languageserver.java.FutureProjectFinder),
  which is held by "ForkJoinPool.commonPool-worker-19"
"ForkJoinPool.commonPool-worker-19":
  waiting to lock monitor 0x00007fe8b800dd00 (object 0x00000007bc327670, a java.util.HashMap),
  which is held by "Simple-Language-Server main thread"

Java stack information for the threads listed above:
===================================================
"Simple-Language-Server main thread":
	at org.springframework.ide.vscode.commons.languageserver.java.FutureProjectFinder.resolvePendingRequests(FutureProjectFinder.java:73)
	- waiting to lock <0x00000007bc3277c8> (a org.springframework.ide.vscode.commons.languageserver.java.FutureProjectFinder)
	at org.springframework.ide.vscode.commons.languageserver.java.FutureProjectFinder$1.created(FutureProjectFinder.java:39)
	at org.springframework.ide.vscode.boot.jdt.ls.JdtLsProjectCache.notifyCreated(JdtLsProjectCache.java:124)
	- locked <0x00000007bc338180> (a java.util.ArrayList)
	at org.springframework.ide.vscode.boot.jdt.ls.JdtLsProjectCache$JstLsClasspathListener.lambda$changed$0(JdtLsProjectCache.java:357)
	- locked <0x00000007bc327670> (a java.util.HashMap)
	at org.springframework.ide.vscode.boot.jdt.ls.JdtLsProjectCache$JstLsClasspathListener$$Lambda$454/0x0000000800435840.run(Unknown Source)
	at reactor.core.publisher.MonoRunnable.call(MonoRunnable.java:73)
	at reactor.core.publisher.MonoRunnable.call(MonoRunnable.java:32)
	at reactor.core.publisher.MonoCallableOnAssembly.call(MonoCallableOnAssembly.java:90)
	at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:135)
	at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56)
	at reactor.core.publisher.Mono.subscribe(Mono.java:4213)
	at reactor.core.publisher.Mono.subscribeWith(Mono.java:4324)
	at reactor.core.publisher.Mono.toFuture(Mono.java:4658)
	at org.springframework.ide.vscode.commons.languageserver.util.SimpleLanguageServer.doOnInitialized(SimpleLanguageServer.java:759)
	at org.springframework.ide.vscode.boot.jdt.ls.JdtLsProjectCache$JstLsClasspathListener.changed(JdtLsProjectCache.java:330)
	at org.springframework.ide.vscode.commons.languageserver.java.ls.ClasspathListenerManager.lambda$addClasspathListener$0(ClasspathListenerManager.java:91)
	at org.springframework.ide.vscode.commons.languageserver.java.ls.ClasspathListenerManager$$Lambda$453/0x0000000800436440.call(Unknown Source)
	at reactor.core.publisher.MonoCallable.call(MonoCallable.java:91)
	at reactor.core.publisher.MonoCallableOnAssembly.call(MonoCallableOnAssembly.java:90)
	at reactor.core.publisher.FluxSubscribeOnCallable$CallableSubscribeOnSubscription.run(FluxSubscribeOnCallable.java:225)
	at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:68)
	at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:28)
	at java.util.concurrent.FutureTask.run(java.base@11.0.10/FutureTask.java:264)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(java.base@11.0.10/ScheduledThreadPoolExecutor.java:304)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@11.0.10/ThreadPoolExecutor.java:1128)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@11.0.10/ThreadPoolExecutor.java:628)
	at java.lang.Thread.run(java.base@11.0.10/Thread.java:834)
"ForkJoinPool.commonPool-worker-19":
	at org.springframework.ide.vscode.boot.jdt.ls.JdtLsProjectCache.find(JdtLsProjectCache.java:201)
	- waiting to lock <0x00000007bc327670> (a java.util.HashMap)
	at org.springframework.ide.vscode.commons.languageserver.java.FutureProjectFinder.findFuture(FutureProjectFinder.java:91)
	- locked <0x00000007bc3277c8> (a org.springframework.ide.vscode.commons.languageserver.java.FutureProjectFinder)
	at org.springframework.ide.vscode.boot.app.SpringSymbolIndex.getSymbols(SpringSymbolIndex.java:550)
	at org.springframework.ide.vscode.boot.java.handlers.BootJavaDocumentSymbolHandler.handle(BootJavaDocumentSymbolHandler.java:33)
	at org.springframework.ide.vscode.commons.languageserver.util.SimpleTextDocumentService.lambda$documentSymbol$9(SimpleTextDocumentService.java:395)
	at org.springframework.ide.vscode.commons.languageserver.util.SimpleTextDocumentService$$Lambda$442/0x0000000800432840.apply(Unknown Source)
	at java.util.concurrent.CompletableFuture$UniApply.tryFire(java.base@11.0.10/CompletableFuture.java:642)
	at java.util.concurrent.CompletableFuture$Completion.exec(java.base@11.0.10/CompletableFuture.java:479)
	at java.util.concurrent.ForkJoinTask.doExec(java.base@11.0.10/ForkJoinTask.java:290)
	at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(java.base@11.0.10/ForkJoinPool.java:1020)
	at java.util.concurrent.ForkJoinPool.scan(java.base@11.0.10/ForkJoinPool.java:1656)
	at java.util.concurrent.ForkJoinPool.runWorker(java.base@11.0.10/ForkJoinPool.java:1594)
	at java.util.concurrent.ForkJoinWorkerThread.run(java.base@11.0.10/ForkJoinWorkerThread.java:183)

Found 1 deadlock.

Issue Analytics

  • State:closed
  • Created 2 years ago
  • Comments:6 (2 by maintainers)

github_iconTop GitHub Comments

1reaction
BoykoAlexcommented, Mar 10, 2022

@martinlippert Yes, i think this is it for #704 - I’ll put a comment and close that issue

0reactions
martinlippertcommented, Mar 10, 2022

@BoykoAlex The fix that you implemented looks like it might also solve https://github.com/spring-projects/sts4/issues/704. Is that correct? If so, we could close that one as well with a reference to the fix commit… 😃

Read more comments on GitHub >

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