[Zope] ZServer lockups

[Brian Hooper]

Hi there -

I've reproduced the same problem here on my setup, also on Win NT.
Here's what I did, and what happened:

1. I set up a Zope installation (Zope 2.0.0b4 w/ patches from the
latest CVS), with an index_html
2. I used Socrates (postcard-shareware testing program) to pound Zope
with a pretty reasonably low request rate.
3. I tried accessing index_html through Netscape while Socrates was
still testing index_html.
4. Both Netscape and Socrates got no response; the Zope machine had a
pop-up dialog on it saying that 'An application error occurred,
Exception: Access violation (0xc0000005), Address 0x00f7a88f)' with
python.exe (I ran z2.py from the command line with -D, hoping to get
a traceback or something)... effectively it looks like the procedure
above can kill Zope/ZServer on Win32.

One thing that I noticed was it seemed like it was fine if I accessed
pages other than the one that was being checked by Socrates - I was able
to click around the management screens a bit before having it lock up -
when I clicked on the top level folder in the management screen
(<pure speculation>probably requiring an access of the same object or
objects which were also being accessed by another thread???</pure
speculation>) that was when I got no response.

Have you found any more clues about this?

--Brian

Robin Becker <robin@jessikat.demon.co.uk> wrote:

> In article <613145F79272D211914B0020AFF64019262879@gandalf.digicool.com>
> , Paul Everitt <Paul@digicool.com> writes
> >
> >
> >And one other debugging thing to look for: when it's hung, check to see
> >if the process is consuming much CPU.
> >
> ...
> ok I don't know what's causing my lockups. I have the 1.9 HTTPResponse
> etc and I can reliably after around 2000 hits from my torture tester get
> the win32 ZServer to lock as far as HTTP is concerned. I can use the
> monitor to see that things are alive in the medusa loop.
> 
> My cpu hog thread is responsive (the job queue is empty) and I'm able to
> add a job and have the server thread go. And the system monitor reports
> no serious work going on unless I start it. I am unable to get in via
> netscape.
> 
> The interesting thing is that the torture script is also hung so it may
> be a strangeness related to win9x ie too many requests hanging on the
> port or somesuch. Killing the torturer doesn't help though.
> 
> I suspect that HTTP publication is locked somehow. When it happens again
> is there anything I can look at to test various/threads etc?
> -- 
> Robin Becker
> 
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