[Zope-dev] Signal 11 restarts

[Matthew T. Kromer]

Hey Steve...

This is a tricky one to pin down;  what I normally do is change the 
startup of Zope so that it can be debugged under gdb, e.g.

$ gdb python
gdb> run z2.py -Z '' -t 1

but that only runs one thread, so you may NEVER encounter the problem. 
 You can experiment with running more than one thread under gdb.  When 
gdb halts next, there's your segfault!  If "where" shows a recursion 
depth of greater than 300 or so, there's an infinate loop.

Alternately, you can run into problems if you try to run against a 
Python with a different storage allocator (and potentially even garbage 
collection, although I *think* gc is safe) since ExtensionClass is not 
aware of the changes to object construction/destruction that need to 
take place.

Some people have reported (and I don't know if they've been fixed) that 
some of the C routines use "PyMem_Del*" methods to delete objects, when 
they should use "PyObject_Delete" to release storage.  This mismatch 
causes grief when additional pointer manipulation is happening by the 
storage allocator and/or garbage collection.

Steve Alexander wrote:

> Hi folks.
>
> I have a Zope 2.4 CVS checkout from a couple of days ago, which I'm 
> running on a linux system on a Cobalt Raq.
>
> I've compiled it against Python 2.1.1 (compiled from source), and 
> compiled a fresh DynPersist.so for it for use with ZPatterns.
>
> Every so often, the server restarts after crashing on a signal 11.
>
> The log entry looks something like this:
>
> 2001-08-15T18:26:03 ERROR(200) zdaemon zdaemon: Wed Aug 15 19:26:03 
> 2001: Aiieee! 8736 exited with error code: 11
>
> I can't reliably reproduce the problem, but it does keep happening.
>
> Seeing as it's a signal 11, I'm guessing that something in Python or a 
> Zope C module isn't compiled right.
>
> Any pointers as to where to start to debug this?
>
> Thanks.
>
> -- 
> Steve Alexander
> Software Engineer
> Cat-Box limited
>
>
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