[Dovecot] segfault in RC15

[Cor Bosman]

> I found two more view syncing bugs:
> http://dovecot.org/list/dovecot-cvs/2007-January/007366.html
> http://dovecot.org/list/dovecot-cvs/2007-January/007368.html

Will try asap.

> > I dont get coredumps anymore which makes this very hard for me to debug. 
> 
> You mean Dovecot just doesn't do that, or you did it on purpose for some
> reason? You should get core dumps as long as:

I believe you added some code that catches these gracefully? I really
dont see any coredumps. User can write, exec=yes, and ulimit -c set.
I used to get coredumps. All I see now are these log entries, not even
a signal notice.

> > possible to make a patch that doesnt copy the files, but dumps the
> > in-memory index someplace?
> 
> Yea, I could do that if the above patches don't help. Although the
> easiest way to debug this would be looking into the core file with gdb..
> 
> > It must be something very unlikely, as I
> > see this on a tiny fraction of our connections. Something like 1 in
> > every 100000. Could it be some race condition on the lock file, and
> > a second process reads a partial index? 
> 
> Hmm. I'm beginning to think that 1. might be the most likely problem.
> Have you tried changing lock_method? Try switching to flock (or to
> fcntl).

Ok, will do.

Cor