[Dovecot] Dovecot 1.0.rc7 ioloop-poll.c assertion failed after SIGHUP

[Timo Sirainen]

On Mon, 2006-09-25 at 11:45 +0100, Chris Wakelin wrote:
> 
> Timo Sirainen wrote:
> > On Mon, 2006-09-25 at 11:16 +0100, Chris Wakelin wrote:
> >> 3) Replace the userdb passwd-file (mv userdb userdb.temp;cp userdb.temp
> >> userdb) to clobber any caching
> > 
> > Or you could just "touch userdb".
> 
> Probably doesn't prevent disk caching, I thought. Though just "cp
> userdb.temp userdb" should work!

Disk caching? Kernel caches the file in both cases anyway.

> #0  0xff21fbe8 in _libc_kill () from /usr/lib/libc.so.1
> (gdb) bt
> #0  0xff21fbe8 in _libc_kill () from /usr/lib/libc.so.1
> #1  0xff1b598c in abort () from /usr/lib/libc.so.1
> #2  0x1f874 in default_fatal_handler (status=196248, format=0xffbef5e8
> "", args=0x1f84c) at failures.c:120

This unfortunately didn't help, since it didn't show what called
io_remove()..

Anyway, I didn't find any reason why these errors could happen from the
code, so I guess it was caused by memory corruption on SIGHUP which I
just fixed:

http://dovecot.org/list/dovecot-cvs/2006-September/006420.html

> Is there a way to get imap-login to dump core when it dies? (We're
> running with the default login_chroot=yes, if that makes any difference.)

Unfortunately it's not really possible without setting login_chroot=no
and also running all dovecot processes under a single uid (including the
master). Maybe I should add some login_insecure_debug-setting which
would drop privileges before execing, make login directory writable by
dovecot and disable chrooting..
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