Incorrect synchronization between threads (CreateIfNotExistsInterceptor and
LockInterceptor)
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Key: JBCACHE-94
URL: http://jira.jboss.com/jira/browse/JBCACHE-94
Project: JBoss Cache
Type: Bug
Reporter: Bela Ban
Assigned to: Bela Ban
Priority: Blocker
Fix For: 1.2.1
Example (assumes RPE-READ (R/W lock) semantics):
- TX1 does a put(/a/b/c)
- TX1 acquires lock1 in CreateIfNotExistsInterceptor
- TX1 creates /a/b (RL) and /a/b/c (WL), locking those nodes
- TX2 does a put(/a/b/c/d), waits on CINE-Int
- TX1 releases lock1
- TX2 acquires lock1 and blocks on lock acquisition for /a/b/c (WL-ed by TX1)
- TX1 does a remove(/a/b/c, key)
- TX1 blocks on lock1 (held by TX2)
- TX2 times out, rolls back changes and releases lock1
- TX1 acquires lock1, makes the change, commits TX and releases all locks
SOLUTION: we need to fine-grained synchronization in
CreateIfNotExistsInterceptor
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