Livelock in PseudoClockScheduler -------------------------------- Key: DROOLS-3573 URL: https://issues.jboss.org/browse/DROOLS-3573 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 7.17.0.Final Reporter: Tibor Zimányi Assignee: Tibor Zimányi Priority: Major When running test with pseudo clock and fireUntilHalt, it could end up in a livelock, where a while loop never ends [1]. The main problem in [1] is the isCancel() if statement. Current synchronization doesn't block cancelling the item during ongoing runCallBacksAndIncreaseTimer method call with [2]. That causes a livelock, because new item is not read in the loop, therefore it iterates over the same item again and again. This can be tested by running CepEspTest.testEventExpirationInSlidingWindow [3] more times in a row till it fails (it always fails after some time). I will create a PR for this. [1] https://github.com/kiegroup/drools/blob/04d58e7714844e73f68e6143e235bb557... [2] https://github.com/kiegroup/drools/blob/04d58e7714844e73f68e6143e235bb557... [3] https://github.com/kiegroup/drools/blob/2bf3c13de000864e7c45b9fd008af2f54...