EHC ❯ Transactional cache with short TTI / TTL can provoke deadlocks

• Type: Bug
• Status: Closed
• Priority: 2 Major
• Resolution: Fixed
• Component/s: ehcache-core
• Labels:

• Assignee: lorban
• Reporter: lorban
• Created: June 15, 2011
• Votes: 0
• Watchers: 0
• Updated:

  July 27, 2012
• Resolved:

  June 20, 2011

Attachments

• lorban (896.0) text/plain EHC-867.patch
• lorban (8.00 k) application/zip example.ehcache.zip

Description

When a transactional cache (local, xa or xa_strict) is configured with a short TTI or TTL there’s a high probability to run into a deadlock.

Attached example app reproduces the problem.

See: http://forums.terracotta.org/forums/posts/list/5573.page

Comments

Ludovic Orban 2011-06-15

The deadlock seems to be caused by a ‘lock leak’ which can happen when an inline eviction fails b/c of a transaction timeout.

Surrounding the eviction code with a try / finally block releasing the lock in the finally seems to solve the issue.

Ludovic Orban 2011-06-20

The proposed patch solves the issue and was confirmed by the user.

Fixed applied in trunk and 2.4.x branch.