Bug 874187
| Summary: | NPE when an event expires during evaluation of accumulate when run as fireUntilHalt() | ||||||
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| Product: | [JBoss] JBoss Enterprise BRMS Platform 5 | Reporter: | Marek Winkler <mwinkler> | ||||
| Component: | BRE (Expert, Fusion) | Assignee: | Nobody <nobody> | ||||
| Status: | CLOSED UPSTREAM | QA Contact: | |||||
| Severity: | high | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | BRMS 5.3.1 | CC: | mfusco | ||||
| Target Milestone: | --- | ||||||
| Target Release: | --- | ||||||
| Hardware: | Unspecified | ||||||
| OS: | Unspecified | ||||||
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| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2025-02-10 03:21:06 UTC | Type: | Bug | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
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Pull request with test case is located at: https://github.com/droolsjbpm/drools/pull/163 Edson Tirelli <ed.tirelli> made a comment on jira DROOLS-70 Mario, I've been unable to reproduce this so far. I've run the test you created a ton of times in a loop, but I can't reproduce the error in an i7 cpu. In any case, the problem here is that event expiration is a WMA, so it shouldn't happen concurrently with any other WMA action (like the insertion of new facts). If it is happening, then the locks in the session are not being properly handled. This product has been discontinued or is no longer tracked in Red Hat Bugzilla. |
Created attachment 640180 [details] NPE stack trace. Description of problem: The AccumulateNode.getFirstMatch() throws NPE when some already collected event expires. The problem occurs when thread A is running StatefulKnowledgeSession.fireUntilHalt() while thread B is inserting new events into the session. The problem occurs when @expires is defined on the event. The lower the @expires value, the more likely the NPE occurs. Version-Release number of selected component (if applicable): 5.3.1.BRMS-ER4 (verified on Drools 5.3.x branch) How reproducible: Will attach a link to pull request with a reproducer test. Steps to Reproduce: 1. Run the test in org.drools.integrationtests.FireUntilHaltAccumulateTest Actual results: With a very high probability the NPE is thrown. Expected results: The test runs without throwing an exception.