[jira] [Created] (QPID-7463) [Python Client for AMQP 0-8,0-9] Race condition when creating session

["Lorenz Quack (JIRA)" <ji...@apache.org>]

Lorenz Quack created QPID-7463:
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             Summary: [Python Client for AMQP 0-8,0-9] Race condition when creating session
                 Key: QPID-7463
                 URL: https://issues.apache.org/jira/browse/QPID-7463
             Project: Qpid
          Issue Type: Bug
          Components: Python Client
    Affects Versions: qpid-python-1.35.0
            Reporter: Lorenz Quack
             Fix For: qpid-python-1.36.0


It seems that {{Client.session()}} is not thread safe. There seems to be a race condition that means two concurrent calls can actually share the same underlying session.

{{Client.session()}} acquires {{self.lock}} and determines a free session id. It then releases the lock before calling {{self.channel(id)}} which acquires the lock again and allocates the id and creates the session.
If a second call to {{Client.session()}} happens in the moment the lock is released but before {{self.channel(id)}} reacquires it the second call will find the same free {{id}} and will then subsequently return the same session object from {{self.channel(id)}}.



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