David wrote at 2006-9-7 12:35 +0100:
>I have a problem with a site running on Zope 2.7.5.
>After a restart the site serves request happily for a while and then  
>hangs, meaning:
>- The server processes are still alive (I can see them with ps)
>- New attempts of page views do not show in the Z2.log
>- Browser just reports time out (not that the site is not available)
>- DeadlockDebugger does not respond either
>There is no recognisable pattern looking at the last requests in the  
>Z2.log before the site hangs. The last requests are mostly just view  
>requests of pages, which display fine after a restart.

I have seen behaviour like this with older Python versions.
In addition, the Zope requests could only be killed with "kill -9".

The behaviour I observed was caused by a Python bug, fixed in Python 2.3.5
and Python 2.4.1. A fatal signal triggers this bug on some operating
systems (e.g. Linux 2.4 with "linuxthread").

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