Deadlock in DefaultISMLocking
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Key: JCR-2753
URL: https://issues.apache.org/jira/browse/JCR-2753
Project: Jackrabbit Content Repository
Issue Type: Bug
Components: jackrabbit-core
Reporter: Thomas Mueller
Assignee: Thomas Mueller
There seems to be a bug in DefaultISMLocking which was detected as part of
JCR-2746.
1) The main thread gets a read lock.
2) The ObservationManager thread tries to lock for writing, which is blocked
because there is still a read lock.
3) Then the main thread tries to get a second read lock, which is blocked
because there is a waiting write lock.
The bug was introduced as part of JCR-2089 (Use java.util.concurrent),
revisions 995411 and 995412. I think the safe solution is to revert those to
commits, and add a test case. If the DefaultISMLocking is changed later on,
more test cases are required. An efficient solution is relatively complicated.
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