Deadlock in model controller encountered in basic test suite ------------------------------------------------------------ Key: WFLY-9531 URL: https://issues.jboss.org/browse/WFLY-9531 Project: WildFly Issue Type: Bug Components: Domain Management, JCA, Test Suite Reporter: David Lloyd Assignee: Brian Stansberry Priority: Critical Attachments: stack.txt A Java-level deadlock was encountered while running {{org.jboss.as.test.integration.jca.workmanager.LongRunningThreadsCheckTestCase}}. The thread dump is attached. This occurred during testing of the new thread pool (WFLY-5332 and related), but it seems unlikely to be caused by this change, unless the new pool's scheduling behavior differed enough from the default that it exposed an already-existing race condition. The deadlock was hit just once in more than 10 runs. This is the deadlock: {noformat} Found one Java-level deadlock: ============================= "DeploymentScanner-threads - 2": waiting for ownable synchronizer 0x000000075357cef0, (a java.util.concurrent.locks.ReentrantLock$NonfairSync), which is held by "MSC service thread 1-1" "MSC service thread 1-1": waiting for ownable synchronizer 0x000000071dff9b08, (a java.util.concurrent.locks.ReentrantLock$NonfairSync), which is held by "MSC service thread 1-2" "MSC service thread 1-2": waiting for ownable synchronizer 0x000000075357cef0, (a java.util.concurrent.locks.ReentrantLock$NonfairSync), which is held by "MSC service thread 1-1" {noformat} Here is the specific deadlock info (also in the attachment), showing that it has something to do with the model controller: {noformat} Java stack information for the threads listed above: =================================================== "DeploymentScanner-threads - 2": at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x000000075357cef0> (a java.util.concurrent.locks.ReentrantLock$NonfairSync) 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.acquireQueued(AbstractQueuedSynchronizer.java:870) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199) at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209) at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285) at org.jboss.as.controller.registry.ConcreteResourceRegistration.getOperationEntry(ConcreteResourceRegistration.java:304) at org.jboss.as.controller.registry.NodeSubregistry.getOperationEntry(NodeSubregistry.java:186) at org.jboss.as.controller.registry.ConcreteResourceRegistration.getOperationEntry(ConcreteResourceRegistration.java:300) at org.jboss.as.controller.registry.NodeSubregistry.getOperationEntry(NodeSubregistry.java:186) at org.jboss.as.controller.registry.ConcreteResourceRegistration.getOperationEntry(ConcreteResourceRegistration.java:300) at org.jboss.as.controller.registry.AbstractResourceRegistration.getOperationEntry(AbstractResourceRegistration.java:180) at org.jboss.as.controller.registry.AbstractResourceRegistration.getOperationEntry(AbstractResourceRegistration.java:175) at org.jboss.as.controller.OperationContextImpl.getAuthorizationAction(OperationContextImpl.java:1890) at org.jboss.as.controller.OperationContextImpl.getBasicAuthorizationResponse(OperationContextImpl.java:1832) at org.jboss.as.controller.OperationContextImpl.authorize(OperationContextImpl.java:1756) at org.jboss.as.controller.OperationContextImpl.authorize(OperationContextImpl.java:1306) at org.jboss.as.controller.operations.global.ReadResourceHandler.doExecuteInternal(ReadResourceHandler.java:316) at org.jboss.as.controller.operations.global.ReadResourceHandler.doExecute(ReadResourceHandler.java:171) at org.jboss.as.controller.operations.global.GlobalOperationHandlers$AbstractMultiTargetHandler.execute(GlobalOperationHandlers.java:231) at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:982) at org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:726) at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:450) at org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1402) at org.jboss.as.controller.ModelControllerImpl.internalExecute(ModelControllerImpl.java:418) at org.jboss.as.controller.ModelControllerImpl.lambda$execute$1(ModelControllerImpl.java:243) at org.jboss.as.controller.ModelControllerImpl$$Lambda$656/1109010279.run(Unknown Source) at org.wildfly.security.auth.server.SecurityIdentity$$Lambda$657/2059677950.run(Unknown Source) at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:263) at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:229) at org.jboss.as.controller.ModelControllerImpl.execute(ModelControllerImpl.java:243) at org.jboss.as.controller.ModelControllerClientFactoryImpl$LocalClient.executeOperation(ModelControllerClientFactoryImpl.java:131) at org.jboss.as.controller.ModelControllerClientFactoryImpl$1$$Lambda$654/385827253.apply(Unknown Source) at org.jboss.as.controller.ModelControllerClientFactoryImpl.lambda$executeInVm$0(ModelControllerClientFactoryImpl.java:296) at org.jboss.as.controller.ModelControllerClientFactoryImpl$$Lambda$655/955046503.run(Unknown Source) at org.jboss.as.controller.access.InVmAccess.runInVm(InVmAccess.java:85) at org.jboss.as.controller.ModelControllerClientFactoryImpl.executeInVm(ModelControllerClientFactoryImpl.java:296) at org.jboss.as.controller.ModelControllerClientFactoryImpl.access$000(ModelControllerClientFactoryImpl.java:54) at org.jboss.as.controller.ModelControllerClientFactoryImpl$1.executeOperation(ModelControllerClientFactoryImpl.java:77) at org.jboss.as.controller.LocalModelControllerClient.execute(LocalModelControllerClient.java:54) at org.jboss.as.controller.LocalModelControllerClient.execute(LocalModelControllerClient.java:39) at org.jboss.as.server.deployment.scanner.DefaultDeploymentOperations$$Lambda$652/737892850.apply(Unknown Source) at org.jboss.as.server.deployment.scanner.DefaultDeploymentOperations$Execution$1.execute(DefaultDeploymentOperations.java:135) at org.jboss.as.server.deployment.scanner.DefaultDeploymentOperations.getDeploymentsStatus(DefaultDeploymentOperations.java:80) at org.jboss.as.server.deployment.scanner.FileSystemDeploymentService$ScanContext.<init>(FileSystemDeploymentService.java:1687) at org.jboss.as.server.deployment.scanner.FileSystemDeploymentService$ScanContext.<init>(FileSystemDeploymentService.java:1636) at org.jboss.as.server.deployment.scanner.FileSystemDeploymentService.scan(FileSystemDeploymentService.java:589) at org.jboss.as.server.deployment.scanner.FileSystemDeploymentService.scan(FileSystemDeploymentService.java:493) at org.jboss.as.server.deployment.scanner.FileSystemDeploymentService$DeploymentScanRunnable.run(FileSystemDeploymentService.java:255) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) at org.jboss.threads.JBossThread.run(JBossThread.java:484) "MSC service thread 1-1": at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x000000071dff9b08> (a java.util.concurrent.locks.ReentrantLock$NonfairSync) 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.acquireQueued(AbstractQueuedSynchronizer.java:870) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199) at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209) at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285) at org.jboss.as.controller.registry.ConcreteResourceRegistration.getCapabilities(ConcreteResourceRegistration.java:607) at org.jboss.as.controller.registry.NodeSubregistry.unregisterSubModel(NodeSubregistry.java:172) at org.jboss.as.controller.registry.ConcreteResourceRegistration.unregisterSubModel(ConcreteResourceRegistration.java:273) at org.jboss.as.connector.services.resourceadapters.IronJacamarActivationResourceService.stop(IronJacamarActivationResourceService.java:283) at org.jboss.msc.service.ServiceControllerImpl$StopTask.stopService(ServiceControllerImpl.java:1761) at org.jboss.msc.service.ServiceControllerImpl$StopTask.execute(ServiceControllerImpl.java:1734) at org.jboss.msc.service.ServiceControllerImpl$ControllerTask.run(ServiceControllerImpl.java:1521) at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1964) at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1467) at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1346) at java.lang.Thread.run(Thread.java:748) "MSC service thread 1-2": at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x000000075357cef0> (a java.util.concurrent.locks.ReentrantLock$NonfairSync) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199) at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209) at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285) at org.jboss.as.controller.registry.ConcreteResourceRegistration.getSubregistry(ConcreteResourceRegistration.java:571) at org.jboss.as.controller.registry.ConcreteResourceRegistration.getChildAddresses(ConcreteResourceRegistration.java:829) at org.jboss.as.controller.registry.NodeSubregistry.getChildAddresses(NodeSubregistry.java:349) at org.jboss.as.controller.registry.ConcreteResourceRegistration.getChildAddresses(ConcreteResourceRegistration.java:833) at org.jboss.as.controller.registry.NodeSubregistry.getChildAddresses(NodeSubregistry.java:349) at org.jboss.as.controller.registry.ConcreteResourceRegistration.getChildAddresses(ConcreteResourceRegistration.java:833) at org.jboss.as.controller.registry.AbstractResourceRegistration.getChildAddresses(AbstractResourceRegistration.java:326) at org.jboss.as.controller.registry.AbstractResourceRegistration.getChildAddresses(AbstractResourceRegistration.java:323) at org.jboss.as.controller.registry.ConcreteResourceRegistration.unregisterSubModel(ConcreteResourceRegistration.java:264) at org.jboss.as.connector.services.resourceadapters.IronJacamarActivationResourceService.stop(IronJacamarActivationResourceService.java:281) at org.jboss.msc.service.ServiceControllerImpl$StopTask.stopService(ServiceControllerImpl.java:1761) at org.jboss.msc.service.ServiceControllerImpl$StopTask.execute(ServiceControllerImpl.java:1734) at org.jboss.msc.service.ServiceControllerImpl$ControllerTask.run(ServiceControllerImpl.java:1521) at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1964) at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1467) at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1346) at java.lang.Thread.run(Thread.java:748) {noformat}