gamin 0.1.7

[Joe Marcus Clarke]

On Wed, 2006-02-08 at 17:02 -0600, eculp at encontacto.net wrote:
> Quoting Alex Dupre <ale at FreeBSD.org>:
> 
> > eculp at encontacto.net wrote:
> >> IIRC, gamin was dumping core, but since it was a production server I 
> >> didn't look further but went back to courier.
> >
> > Was the gam_server to dump core or the courier-imap using libgamin? 
> > If it was the former it never happened to me, the latter could be a 
> > courier bug exploited by an unexpected different behaviour of gamin.
> >
> >> If you think the new version has a chance of working with courier, I 
> >> could give it a try.  Early tomorrow morning or maybe this evening 
> >> if I can get caught up. (CST).
> >
> > Giving a real quick look at courier source code I can see a few 
> > potential bugs regarding missing or uncorrect checks of FAMPending 
> > return values. I don't know if they can cause logical errors and dump 
> > core, but surely the fam integration is not perfect. The quick answer 
> > is "try the new version", even if the probabilities are not many.
> 
> Alex, I was mistaken.  I just deinstalled fam and installed the new 
> gamin port and found that the real problem is that imapd is dumping 
> core not gamin.
> 
> Feb  8 16:47:58 home kernel: pid 58199 (imapd), uid 80: exited on 
> signal 11 (core dumped)
> Feb  8 16:48:01 home kernel: pid 58201 (imapd), uid 80: exited on 
> signal 11 (core dumped)
> Feb  8 16:48:03 home kernel: pid 58198 (imapd), uid 80: exited on 
> signal 11 (core dumped)
> 
> and dumping with an Sig 11 that I hate.  I always think memory but 
> switching back to fam it again works perfectly.  Not much help I'm 
> afraid.  If there is anything special that I can test for you, let me 
> know.  I've got both compiled now so it isn't difficult to switch back 
> and forth.

Signal 11 is a segmentation fault indicating a NULL pointer dereference.
Compile courier with debugging symbols, then get a full backtrace when
imapd dumps core:

gdb imapd imapd.core
(gdb) bt full

Joe

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