(Again) Some trouble with dovecot 2.1(.7) and SASL

[admin]

The parentheses in the subject are due to referral to this discussion on the mailing list: http://dovecot.org/list/dovecot/2012-February/063851.html

At first I thought I found the problem, but then realized this was 2012 and the suggested patch already is applied in dovecot.

I also have segault messages in my kernel log; not too many, but it was enough to dig for it:

> Wed Jun 25 08:29:05 2014 auth[17590]: segfault at 10 ip 00007f02ad5e8e56 sp 00007fff932f9250 error 4 in auth[7f02ad5d3000+40000]
> Mon Jun 30 16:11:41 2014 auth[12501]: segfault at 10 ip 00007fc6a1fefe56 sp 00007fff276e6ea0 error 4 in auth[7fc6a1fda000+40000]
> Sat Jul  5 13:11:32 2014 auth[15603]: segfault at 10 ip 00007f6447a6be56 sp 00007fff09c48020 error 4 in auth[7f6447a56000+40000]
> Tue Jul  8 05:08:21 2014 auth[30071]: segfault at 10 ip 00007ff22656ae56 sp 00007fff26b017f0 error 4 in auth[7ff226555000+40000]
> Mon Jul 21 14:25:28 2014 auth[30918]: segfault at 10 ip 00007fe1fc817e56 sp 00007fff7e654f20 error 4 in auth[7fe1fc802000+40000] <---
> Wed Aug 13 18:56:31 2014 auth[27593]: segfault at 10 ip 00007ffbf8ce8e56 sp 00007fffe0157f70 error 4 in auth[7ffbf8cd3000+40000]
> Wed Aug 13 18:57:59 2014 auth[24264]: segfault at 10 ip 00007f2df31bde56 sp 00007fff094263c0 error 4 in auth[7f2df31a8000+40000]


The last 2 entries are a result of me being able to reproduce the problem, the 3rd last is the only one I was able to track down (due to log rotation)

I tracked the problem down to a contact form of a website of one of my customers. whenever used, the segfault gets triggered.
Nevertheless, the message always gets delivered.

So we are talking about the marked line; the corresponding log entries from mail.info:

> Jul 21 14:25:29 mail postfix/smtpd[27590]: connect from unknown[<webserver ip>]
> Jul 21 14:25:29 mail dovecot: auth: Fatal: master: service(auth): child 30918 killed with signal 11 (core dumps disabled)
> Jul 21 14:25:29 mail postfix/smtpd[27590]: warning: unknown[<webserver ip>]: SASL DIGEST-MD5 authentication failed: Connection lost to authentication server
> Jul 21 14:25:29 mail dovecot: auth-worker(27595): mysql(127.0.0.1): Connected to database mail
> Jul 21 14:25:29 mail postfix/smtpd[27590]: D4D8E44752: client=unknown[<webserver ip>], sasl_method=CRAM-MD5, sasl_username=<existing account and working account>
> Jul 21 14:25:29 mail postfix/cleanup[27598]: D4D8E44752: message-id=<id at doma.in>
> Jul 21 14:25:29 mail postfix/qmgr[13349]: D4D8E44752: from=<server at doma.in>, size=2680, nrcpt=1 (queue active)
> Jul 21 14:25:29 mail postfix/smtpd[27590]: disconnect from unknown[<webserver ip>]
> Jul 21 14:25:29 mail dovecot: lmtp(27600): Connect from local
> Jul 21 14:25:30 mail postfix/lmtp[27599]: D4D8E44752: to=<info at doma.in>, orig_to=<contact at doma.in>, relay=<mailserver fqdn>[private/dovecot-lmtp], delay=0.19, delays=0.07/0.04/0.04/0.04, dsn=2.0.0, status=sent (250 2.0.0 <info at doma.in> MrY+OdkizVPQawAAMrkmwA Saved)
> Jul 21 14:25:30 mail postfix/qmgr[13349]: D4D8E44752: removed
> Jul 21 14:25:30 mail dovecot: lmtp(27600, info at doma.in): MrY+OdkizVPQawAAMrkmwA: msgid=<id at doma.in>: saved mail to INBOX
> Jul 21 14:25:30 mail dovecot: lmtp(27600): Disconnect from local: Client quit (in reset)


contact at doma.in is a virtual address which gets forwarded to info at doma.in (/etc/postfix/virtual).

The used CMS is PyroCMS (v2.2.3) - the version is not up2date, but nevertheless the CMS might be the one to blame, a service should not segfault.
Some packages are to be updated, as well as the CMS; but I am willing to wait to provide information, which leads to the problem, as I cannot switch
between different versions on my productive system for the sake of gaining debug information.

I hope that someone has any kind of clue and is willing to resolve that issue with me, asking me for the necessary information to do so.

Thanks in advance!
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