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

     [ https://issues.apache.org/jira/browse/CASSANDRA-2951?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-2951:
--------------------------------------

    Attachment: 2951.txt

patch adds reference counting to FreeableMemory

> 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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