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https://issues.apache.org/jira/browse/QPID-7317?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Conway updated QPID-7317:
------------------------------
Attachment: bad_child.py
Updated bad_child.py to demonstrate a similar hang if an atexit handler is
registered in the parent and uses an updated connection created by the child.
This is because forking and re-creating the selector inverts the order of
atexit calls so the selector is stopped before the connection is used. Run
python bad_child.py --bad_child=0 --atexit=1
The review at https://reviews.apache.org/r/51290/ is updated to raise an
exception if this happens but does not yet provide a fix - waiting to confirm
whether this is the real issue.
> Deadlock on publish
> -------------------
>
> Key: QPID-7317
> URL: https://issues.apache.org/jira/browse/QPID-7317
> Project: Qpid
> Issue Type: Bug
> Components: Python Client
> Affects Versions: 0.32
> Environment: python-qpid-0.32-13.fc23.noarch
> Reporter: Brian Bouterse
> Assignee: Alan Conway
> Attachments: bad_child.py, bad_child.py, bt.txt, lsof.txt,
> spout-hang-trace.txt, spout-hang.py, taabt.txt
>
>
> When publishing a task with qpid.messaging it deadlocks and our application
> cannot continue. This has not been a problem for several releases, but within
> a few days recently, another Satellite developer and I both experienced the
> issue on separate machines, different distros. He is using a MRG built
> pacakge (not sure of version). I am using python-qpid-0.32-13.fc23.
> Both deadlocked machines had core dumps taken on the deadlocked processes and
> only show only 1 Qpid thread when I expect there to be 2. There are other
> mongo threads, but those are idle as expected and not related. The traces
> show our application calling into qpid.messaging to publish a message to the
> message bus.
> This problem happens intermittently, and in cases where message publish is
> successful I've verified by core dump that there are the expected 2 threads
> for Qpid.
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