[Zope-dev] Zope hangs, with processes being idle ... (rather urgent problem)

[Dieter Maurer]

Joachim Werner writes:
 > I have a Zope 2.5.1 using ZEO on Linux, with Apache as proxy server. The two
 > ZEO clients run fine for a couple of hours, and then suddenly one of them
 > stops responding. It's the type of Zope hangs when all processes are fine,
 > but ZServer just doesn't respond (load is very low, with the CPU 90% idle,
 > so it is not a performance issue or recursion problem).
 > 
 > There is no error before this situation happens. The processes just don't
 > respond any more. The second ZEO keeps running, but that machine also hangs
 > from time to time, so I guess ZEO is not the problem, and the hardware or
 > any Linux-specific problems aren't either.
 > 
 > When the ZServer hangs, I can not access it directly, so it is no problem
 > with the Apache.
 > 
 > You see, I don't have any clue on what is happening here. The servers worked
 > fine for months, and I don't know what specific change could have caused the
 > problem.
 > 
 > How can such a situation be debugged?
Maybe, you use the "-M" logging and analyse the log with Chris'
"requestprofiler". You may see unfinished requests.


Dieter