[jira] Updated: (QPID-2153) channel collision renders pre-existing session unusable on client

["Gordon Sim (JIRA)" <qp...@incubator.apache.org>]

     [ https://issues.apache.org/jira/browse/QPID-2153?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gordon Sim updated QPID-2153:
-----------------------------

    Affects Version/s: 0.5
        Fix Version/s:     (was: 0.5)
                       0.6

> channel collision renders pre-existing session unusable on client
> -----------------------------------------------------------------
>
>                 Key: QPID-2153
>                 URL: https://issues.apache.org/jira/browse/QPID-2153
>             Project: Qpid
>          Issue Type: Bug
>          Components: C++ Client
>    Affects Versions: 0.5
>            Reporter: Gordon Sim
>            Assignee: Gordon Sim
>             Fix For: 0.6
>
>
> There are 2^16 channels available on each connection. Each session in use
> requires one of these channels to be assigned. If more than 2^16 sessions are
> created and deleted, the channel allocated to new sessions 'wraps around' and
> can result in a collision with that allocated to a pre-existing session
> resulting in a session-busy exception. This exception renders the pre-existing
> session unusable on the client side (though the broker still assumes it is
> attached).
> Though there is a check for in-use sessions, the channel is set on the new session regardless of that check and when that session is then destroyed (as it will be if the exception is thrown) it will request the session on that channel to be erase (on the invalid assumption that it refers to itself).

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