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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-2951) FreeableMemory can be accessed after it is invalid
Date Tue, 26 Jul 2011 22:03:10 GMT
FreeableMemory can be accessed after it is invalid
--------------------------------------------------

                 Key: CASSANDRA-2951
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2951
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 0.8.0
            Reporter: Jonathan Ellis
            Assignee: Jonathan Ellis
            Priority: Minor
             Fix For: 0.8.3
         Attachments: 2951.txt

SerializingCache.get looks like this:

{code}
    public V get(Object key)
    {
        FreeableMemory mem = map.get(key);
        if (mem == null)
            return null;
        return deserialize(mem);
    }
{code}

If a cache object is evicted or replaced after the get happens, but before deserialize completes,
we will trigger an assertion failure (if asserts are enabled) or segfault (if they are not).

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