[dovecot] Re: Three *very* strange bugs

[Timo Sirainen]

On Tue, 2003-04-15 at 15:43, Warren Togami wrote:
> Simultaneously this appears in my /var/log/maillog:
> Apr 15 01:44:50 server dovecot: child 20328 (imap) killed with signal 11
> 
> If I attempt to keep reading mail, it logs in again to dovecot and works
> normally until I attempt to read that spam again.  Evolution displays
> the error popup again though I don't see another signal 11 in maillog. 
> After this point I am unable to log back into dovecot without restarting
> the daemon.

OK, thanks, fixed. Dovecot crashed with "FETCH nnn BODY[n.MIME]", so
pretty much any multipart mail crashed with Evolution.

> Here's the strange part...
> I browsed the same IMAP folder from KMail, and kmail has no problem
> reading that spam message.  dovecot's [imap] process does not
> segmentation fault.

KMail doesn't fetch MIME headers separately. I think it fetches whole
message at once.

> Bug #3 kernel?
> ==============
> This is an unrelated bug and perhaps not the fault of dovecot.  When I
> attempted to use strace to get some debugging info on the [imap]
> process, this happened:
> 
> [root at server /]# strace -p 20486
> trace: ptrace(PTRACE_SYSCALL, ...): Operation not permitted
> detach: ptrace(PTRACE_DETACH, ...): Operation not permitted
> [root at server /]# 

I have no problem stracing. I don't think Dovecot does anything that
should prevent it. Or, well, it might be because it's thought of as
setuid process, but root should be able to strace it.