[Dovecot] dovecot crashing?

[Eric]

Isn't the version I have (2.0.9) newer than 2.0.19? The newest RPM I could
find for CentOS was dovecot-2.0.9-2, not all that much newer than what I am
using. I am not opposed to upgrading, just not sure if I am seeing much in
the way of RPMs for my system that I can use to upgrade to a version that
is much newer than what I already have.

I had taken the " echo 'DAEMON_COREFILE_LIMIT="unlimited"' >>
/etc/sysconfig/dovecot" command from the Dovecot page on enabling core
dumps for Red Hat (http://www.dovecot.org/bugreport.html). I have also
added unlimited core dump files to /etc/security/limits.conf and verified
that whenever myself or anyone else opens a shell that "ulimit -c" shows an
output of "unlimited".

I don't see any mention of limits in my Dovecot init file either. The init
script came with my RPM package and I have not modified it.

Even though I have unlimited core dump files allowed, I am still getting
core files that are 0 bytes in size in the mail user's home directory. Any
idea why?

[root at imapserver ~]# su - dovecot
-bash-3.2$ ulimit -c
unlimited
-bash-3.2$ id
uid=97(dovecot) gid=97(dovecot) groups=97(dovecot)

[root at imapserver ~]# service dovecot restart
Stopping Dovecot Imap:                                     [  OK  ]
Starting Dovecot Imap:                                     [  OK  ]

$ telnet imapserver imap
Trying 1.1.1.1...
Connected to imapserver (1.1.1.1).
Escape character is '^]'.
* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE
AUTH=PLAIN] Dovecot ready.
1 LOGIN imapuser imapuserpassword
1 OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE
SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS MULTIAPPEND UNSELECT
CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTOR
E QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS] Logged
in
2 select INBOX
* FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
* OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft \*)] Flags
permitted.
* 2 EXISTS
* 0 RECENT
* OK [UNSEEN 1] First unseen.
* OK [UIDVALIDITY 1356130761] UIDs valid
* OK [UIDNEXT 8] Predicted next UID
* OK [HIGHESTMODSEQ 1] Highest
2 OK [READ-WRITE] Select completed.
3 FETCH 1 BODY[]
* 1 FETCH (FLAGS (\Seen) BODY[] {39306}

..... some brief message output .....

Connection closed by foreign host.

And then I get an empty core file:

[root at imapserver]# pwd
/mnt/mail/imapuser
[root at imapserver]# ls -lh core*
-rw------- 1 imapuser imapuser 0 Dec 30 00:56 core.7319




On Sat, Dec 29, 2012 at 12:18 PM, Jim Lawson <jtl+dovecot at uvm.edu> wrote:

>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hi Eric,
>
> On 12/25/12 9:26 PM, Eric wrote:
> > Happy holidays! I am experiencing an issue when trying to check my mail
> > using IMAP. with Dovecot I have tried checking my mail using a full GUI
> > client (Thunderbird) and telnet. Both times I get disconnected before all
> > of my messages can be downloaded and I see an error in my mail log. Here
> > are the details:
> >
> >
> > [root at cust19-1-prod-domain userqa]# dovecot --version
> > 2.0.9
>
> There have been a lot of fixes since that version; can you confirm that
> this problem is not in 2.0.19 (or better yet, 2.1.12?)
>
>
> > i enabled core dumps:
> >
> > echo 'DAEMON_COREFILE_LIMIT="unlimited"' >> /etc/sysconfig/dovecot
>
> Does that work?  The point is to set "ulimit -c unlimited".  I don't
> know what package you're using, but Dovecot doesn't ship with an init
> script (at least, 2.0.9 didn't.)  The only thing I know of is at
> http://wiki.dovecot.org/DovecotInit, and that doesn't use /etc/sysconfig
> at all.
>
>
> >
> >
> > Now I see this in /var/log/maillog:
> >
> > 2012-12-25T17:53:47-08:00 cust19-1-prod-domain dovecot: master: Error:
> > service(imap): child 11265 killed with signal 11 (core dumped)
> >
> > core dumps are being written here, but they're empty:
>
> If you're still getting core dumps with 2.0.19, check your setting of
> "ulimit -c".  It should be "unlimited" for this case.  You may need to
> modify /etc/init.d/dovecot.  My guess is that your
> /etc/sysconfig/dovecot modification is having no effect.
>
> Jim
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