Issue

You upgraded to 1.609 through to 1.617, your instance doesn’t reply and a threads dump reports a deadlock where one of the deadlocks includes hudson.model.Queue.maintain() and the other deadlocked thread includes Executor like so:

at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
  at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
  at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867)
  at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1197)
  at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:214)
  at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:290)
  at hudson.model.Queue._withLock(Queue.java:1205)
  at hudson.model.Queue.withLock(Queue.java:1143)
  at hudson.model.Computer.removeExecutor(Computer.java:977)
  at hudson.model.Executor.interrupt(Executor.java:187)

Environment

• CloudBees Jenkins Enterprise 15.05 ( 1.609.1.1 )
• Jenkins 1.609 -> 1.617

Resolution

This problem was reported as JENKINS-28840 and is fixed in Jenkins 1.618 (and should be in the LTS 1.609.3). 

If you are running CloudBees Jenkins Enterprise 15.05 ( 1.609.1.1 ) please contact the CloudBees Support who will provide you a hotfix for this problem.