[Zope] zope process goes to sleep

Dieter Maurer dieter@handshake.de
Fri, 14 Mar 2003 22:21:20 +0100

AM wrote at 2003-3-13 11:23 -0800:
 > We have Zope 2.6.1 (upgraded) running behind Apache 2.0 on a Redhat 8 
 > dual processor machine with Py 2.1.3. Its been live for quite a few days.
 > Now every night at around 3-5 AM the server sort of stops responding. A 
 > ps -ax still shows the process running, and a ping to port 8080 on the 
 > machine returns a valid response, just that the server doesnt respond 
 > and Apache returns a proxy error.
 > ...
 > Any ideas as to what might be causing that? Has anybody seen that before?/

We have a similar effect:

  Zope suddenly stops and sometimes even a SIGTERM is unable
  to kill it (requires SIGKILL).

  I was once able to provoke this behaviour by pressing
  the "minimize" button in "Control_Panel --> Database Management
  --> Flush Cache".

  Therefore, I expect the problem to be a deadlock somehow
  related to invalidation (something requiring two looks
  acquired in different order at different places).

I did not yet seriously analyse the problem.