Details
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Bug
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Resolution: Fixed
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Minor
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Jenkins 2.60.2
Description
Got a deadlock while developing a cloud plugin I was attempting to have the plugin delete nodes as soon as they finish a task, in taskCompleted. Specifically in this case, the following happened:
- Cloud plugin started provisioning, added new nodes to Jenkins, and returned callable PlannedNode
- Node connected immediately upon adding node
- Job was scheduled and started running
- Job was extremely fast (just a pipeline node with hello world echo
- taskCompleted called
- Node removed in taskCompleted.
My hunch here is that this has little to do with the cloud plugin, and more to do with simply having a job that executes extremely quickly with the addition of node removal in taskCompleted.
WARNING: Some health checks are reporting as unhealthy: [thread-deadlock : [AtmostOneTaskExecutor[Periodic Jenkins queue maintenance] [#64] locked on java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync@545ee67e (owned by Executor #0 for Windows.10.Jenkins.Amd64-0816090454259-0 : executing PlaceholderExecutable:ExecutorStepExecution.PlaceholderTask{runId=helix-agents-test#23,label=Windows.10.Jenkins.Amd64,context=CpsStepContext[11:node]:Owner[helix-agents-test/23:helix-agents-test #23],cookie=null}): at sun.misc.Unsafe.park(Native Method) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836) at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(AbstractQueuedSynchronizer.java:967) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1283) at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:727) at hudson.model.Executor.isParking(Executor.java:640) at hudson.model.Queue.maintain(Queue.java:1442) at hudson.model.Queue$1.call(Queue.java:321) at hudson.model.Queue$1.call(Queue.java:318) at jenkins.util.AtmostOneTaskExecutor$1.call(AtmostOneTaskExecutor.java:108) at jenkins.util.AtmostOneTaskExecutor$1.call(AtmostOneTaskExecutor.java:98) at jenkins.security.ImpersonatingExecutorService$2.call(ImpersonatingExecutorService.java:71) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:110) at java.lang.Thread.run(Thread.java:748) , Executor #0 for Windows.10.Jenkins.Amd64-0816090454259-0 : executing PlaceholderExecutable:ExecutorStepExecution.PlaceholderTask{runId=helix-agents-test#23,label=Windows.10.Jenkins.Amd64,context=CpsStepContext[11:node]:Owner[helix-agents-test/23:helix-agents-test #23],cookie=null} locked on java.util.concurrent.locks.ReentrantLock$NonfairSync@5a990285 (owned by AtmostOneTaskExecutor[Periodic Jenkins queue maintenance] [#64]): at sun.misc.Unsafe.park(Native Method) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199) at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209) at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285) at hudson.model.Queue._withLock(Queue.java:1340) at hudson.model.Queue.withLock(Queue.java:1219) at jenkins.model.Nodes.removeNode(Nodes.java:237) at jenkins.model.Jenkins.removeNode(Jenkins.java:2123) at com.microsoft.helix.helixagents.HelixComputer.taskCompleted(HelixComputer.java:69) at hudson.model.queue.WorkUnitContext.synchronizeEnd(WorkUnitContext.java:140) at hudson.model.Executor.finish1(Executor.java:451) at hudson.model.Executor.completedAsynchronous(Executor.java:473) at jenkins.model.queue.AsynchronousExecution.setExecutor(AsynchronousExecution.java:115) at hudson.model.Executor.run(Executor.java:409)
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