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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