dovecot - Jun 2014 - imap-login killed with signal 11 in Dovecot 2.2.13 (feea8645c4d7)

Latest 2.2.13 HG feea8645c4d7 seems to unexpectedly kill imap-login sessions:

Jun  7 11:56:10 nihlus dovecot: imap(tlx at leuxner.net): Disconnected: Logged
out in=2203 out=851225
Jun  7 11:56:10 nihlus dovecot: imap(tlx at leuxner.net): Disconnected: Logged
out in=316 out=2417
Jun  7 11:56:10 nihlus dovecot: imap-login: Fatal: master: service(imap-login):
child 60505 killed with signal 11 (core not dumped - add -D parameter to service
imap-login { executable }
Jun  7 11:56:10 nihlus dovecot: imap-login: Fatal: master: service(imap-login):
child 60595 killed with signal 11 (core not dumped - add -D parameter to service
imap-login { executable }

Adding the -D parameter does not generate a core dump however...
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On 06/07/2014 10:15 AM Thomas Leuxner wrote:
> Latest 2.2.13 HG feea8645c4d7 seems to unexpectedly kill imap-login
sessions:
> 
> Jun  7 11:56:10 nihlus dovecot: imap(tlx at leuxner.net): Disconnected:
Logged out in=2203 out=851225
> Jun  7 11:56:10 nihlus dovecot: imap(tlx at leuxner.net): Disconnected:
Logged out in=316 out=2417
> Jun  7 11:56:10 nihlus dovecot: imap-login: Fatal: master:
service(imap-login): child 60505 killed with signal 11 (core not dumped - add -D
parameter to service imap-login { executable }
> Jun  7 11:56:10 nihlus dovecot: imap-login: Fatal: master:
service(imap-login): child 60595 killed with signal 11 (core not dumped - add -D
parameter to service imap-login { executable }
> 
> Adding the -D parameter does not generate a core dump however...
> 
Hi Thomas,

either add "ulimit -c unlimited" to your init script
<http://hg.dovecot.org/dovecot-2.2/file/tip/doc/dovecot-initd.sh#l19> or
start Dovecot directly from your shell:

	ulimit -c unlimited
	dovecot [-c /path/2/dovecot.conf]

That should make Dovecot dumping core files.


Regards,
Pascal
-- 
The trapper recommends today: c01dcafe.1415816 at localdomain.org

* Thomas Leuxner <tlx at leuxner.net> 2014.06.07 12:15:
> Latest 2.2.13 HG feea8645c4d7 seems to unexpectedly kill imap-login
sessions:
I can crash the process at will over a TLS connection with mutt, which I
can't when disabling TLS. So the culprit most-likely is this change:

http://hg.dovecot.org/dovecot-2.2/rev/09d3c9c6f0ad

It seems difficult to predict the imap-login process that will crash, hence I
struggle which one to connect GDB to...
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On 7.6.2014, at 13.15, Thomas Leuxner <tlx at leuxner.net> wrote:
> Latest 2.2.13 HG feea8645c4d7 seems to unexpectedly kill imap-login
sessions:
> 
> Jun  7 11:56:10 nihlus dovecot: imap(tlx at leuxner.net): Disconnected:
Logged out in=2203 out=851225
> Jun  7 11:56:10 nihlus dovecot: imap(tlx at leuxner.net): Disconnected:
Logged out in=316 out=2417
> Jun  7 11:56:10 nihlus dovecot: imap-login: Fatal: master:
service(imap-login): child 60505 killed with signal 11 (core not dumped - add -D
parameter to service imap-login { executable }
> Jun  7 11:56:10 nihlus dovecot: imap-login: Fatal: master:
service(imap-login): child 60595 killed with signal 11 (core not dumped - add -D
parameter to service imap-login { executable }
Should be fixed by these:

http://hg.dovecot.org/dovecot-2.2/rev/7129fe8bc260
http://hg.dovecot.org/dovecot-2.2/rev/5259f6320e52