Get stacktrace from stuck python process

Posted by piquadrat on Stack Overflow See other posts from Stack Overflow or by piquadrat
Published on 2009-11-23T09:14:29Z Indexed on 2010/04/18 0:13 UTC
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Filed under:

python

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zope

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debug

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infinite-loop

I have to run a legacy Zope2 website and have some grievance with it. The biggest issue is that, occasionally, it just locks up, running at 100% CPU load and not answering to requests anymore. While the problem isn't reproducible on a regular basis, one page containing 3 dynamic graphs triggers it sometimes, so I suspect some kind of race condition that leads to an endless loop or a stuck busywait.

The problem is, I have not yet found a way to debug this thing. There's nothing in the Zope logs and nothing in the system logs. I tried the suggestions from this question to get a stacktrace, but the only signal that has any effect is SIGKILL.

Is there another possibility to find out where exactly the process is when it gets stuck?

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