[JIRA] [throttle-concurrents] (JENKINS-21044) Throttle Concurrent Builds blocking Jenkins queue

[jenk...@gcummings.com (JIRA)]

Geoff Cummings created JENKINS-21044 Throttle Concurrent Builds blocking Jenkins queue Issue Type: Bug Affects Versions: current Assignee: abayer Components: throttle-concurrents Created: 17/Dec/13 2:34 PM Description: Jenkins had stopped responding to browser requests for Jenkins pages and I think it may be caused by the recent upgrade to Throttle Concurrent Builds 1.8.1 Requests were getting blocked waiting on 0x00000004181e4520 "Handling GET /jenkins/ : RequestHandlerThread[#171]" daemon prio=10 tid=0x00000000168ee800 nid=0x193b waiting for monitor entry [0x000000004335b000] java.lang.Thread.State: BLOCKED (on object monitor) at hudson.model.Queue.getItems(Queue.java:687) - waiting to lock <0x00000004181e4520> (a hudson.model.Queue) at hudson.model.Queue$CachedItemList.get(Queue.java:216) at hudson.model.Queue.getApproximateItemsQuickly(Queue.java:717) at hudson.model.View.getApproximateQueueItemsQuickly(View.java:483) at sun.reflect.GeneratedMethodAccessor355.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) This seems to be waiting on Throttle Concurrent Builds code. Further dumps after 10 minutes, 20 minutes and 30 minutes showed this same stack trace. "Thread-126" daemon prio=10 tid=0x00002aaae0529800 nid=0x1785 runnable [0x0000000046590000] java.lang.Thread.State: RUNNABLE at java.util.WeakHashMap$HashIterator.hasNext(WeakHashMap.java:875) at java.util.AbstractCollection.toArray(AbstractCollection.java:139) at java.util.ArrayList.<init>(ArrayList.java:164) at hudson.plugins.throttleconcurrents.ThrottleJobProperty.getCategoryProjects(ThrottleJobProperty.java:141) - locked <0x000000041a79b778> (a java.util.HashMap) at hudson.plugins.throttleconcurrents.ThrottleQueueTaskDispatcher.canRun(ThrottleQueueTaskDispatcher.java:118) at hudson.plugins.throttleconcurrents.ThrottleQueueTaskDispatcher.canRun(ThrottleQueueTaskDispatcher.java:90) at hudson.model.Queue.isBuildBlocked(Queue.java:937) at hudson.model.Queue.maintain(Queue.java:1006) - locked <0x00000004181e4520> (a hudson.model.Queue) at hudson.model.Queue$1.call(Queue.java:303) at hudson.model.Queue$1.call(Queue.java:300) at jenkins.util.AtmostOneTaskExecutor$1.call(AtmostOneTaskExecutor.java:69) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:104) at java.lang.Thread.run(Thread.java:724) Locked ownable synchronizers: - None CPU usage was at ~100% for this thread for the 30 minutes that I was watching it before I restarted Jenkins. (6021 = 0x1785) PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 6021 rcbuild_ 35 10 18.0g 6.2g 32m R 99.7 19.7 30:45.97 java I have rolled back to Throttle Concurrent Builds 1.8 for now. Still learning how to investigate thread dumps but please let me know if there is anything I can do to help. Environment: Jenkins 1.544 Project: Jenkins Priority: Critical Reporter: Geoff Cummings

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