[JIRA] [locks-and-latches-plugin] (JENKINS-13828) locks-and-latches not release job and infinitely waits for unlock.

Wed, 07 Jan 2015 00:08:48 -0800

 
Arnaud Nauwynck edited a comment on Bug JENKINS-13828

Hi,

I also encountered this bug ... and I have implemented a workaround, that avoid restarting my jenkins master.
The workaround is a groovy script to execute as admin in the web page "https://<<jenkins>>/script"

ForceUnlockLatch.groovy
import hudson.plugins.locksandlatches.LockWrapper;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.AbstractOwnableSynchronizer;
import java.util.concurrent.locks.AbstractQueuedSynchronizer;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

String lockName = "xxx-lock-name";

String text = "";
LockWrapper.DescriptorImpl descr = LockWrapper.DESCRIPTOR;
// invoke field "backupLocks"
Field backupLocksField = LockWrapper.DescriptorImpl.class.getDeclaredField("backupLocks");
backupLocksField.setAccessible(true);
Map<String,Object> backupLocks = (Map<String,Object>) backupLocksField.get(descr);

ReentrantLock lockObj = (ReentrantLock) backupLocks.get(lockName);

if (lockObj == null) {
  text += "NULL : lock not found";
} else if (lockObj.isLocked()) {
  text += "*** before Unlock: " + lockObj;

  if (! lockObj.isHeldByCurrentThread()) {
   // can not release from another thread... => java.lang.IllegalMonitorStateException
    // invoke "lockObj.sync.setExclusiveOwnerThread(currentThread)";
    Field syncField = lockObj.getClass().getDeclaredField("sync");
    syncField.setAccessible(true);
    AbstractOwnableSynchronizer lockSync = syncField.get(lockObj);
  
    Thread currentThread = Thread.currentThread();
    Method setExclusiveOwnerThreadMethod = AbstractOwnableSynchronizer.class.getDeclaredMethod("setExclusiveOwnerThread", Thread.class);
    setExclusiveOwnerThreadMethod.setAccessible(true);
    setExclusiveOwnerThreadMethod.invoke(lockSync, currentThread);
  }

  // *** do unlock ***
  lockObj.unlock();

  text += "\n *** after unlock:" + lockObj;
} else {
  text += "NOT locked : " + lockObj;
}

text;
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