On Mon, Feb 11, 2019 at 10:31 AM Stephan Bosch via dovecot <dovecot@dovecot.org> wrote:

Op 9-2-2019 om 19:27 schreef Giacomo via dovecot:
> I got a core file this morning.
>
> opening it with gdb I get this:
>
> (gdb) core imap.core
> Core was generated by `dovecot/imap'.
> Program terminated with signal 6, Aborted.
> #0 0x0000000011c1347a in ?? ()
> (gdb) bt
> #0 0x0000000011c1347a in ?? ()
> #1 0x0000000011c13444 in ?? ()
> #2 0x0000000000018dee in ?? ()
> #3 0x306db139575f3b0d in ?? ()
> #4 0x00007fffffffc144 in ?? ()
> #5 0x0000000000000000 in ?? ()
>
> Doesn't look clean at all.

That is not that helpful. Did you install debug symbols for Dovecot?
This is usually a separate package. It all depends on your OS. I am not
familiar with FreeBSD.

Regards,

Stephan.

>
> let me know if I should upload the file somewhere.
>
> Thanks
>
> Il giorno lun 21 gen 2019 alle ore 08:52 Giacomo
> <giacomo1989@gmail.com <mailto:giacomo1989@gmail.com>> ha scritto:
>
> I've just enabled core dumps on the involved FreeBSD system. Let's
> see if it dumps something..
>
> Il giorno dom 20 gen 2019 alle ore 19:16 Stephan Bosch
> <stephan@rename-it.nl <mailto:stephan@rename-it.nl>> ha scritto:
>
> Hi Giacomo,
>
> Op 21/12/2018 om 16:16 schreef Giacomo:
> > The bug happens not very often, it might need a week to get
> a core file.
>
> Any luck getting a core file?
>
> Regards,
>
> Stephan.
> >
> >
> > Il giorno ven 21 dic 2018 alle ore 15:18 Aki Tuomi
> > <aki.tuomi@open-xchange.com
> <mailto:aki.tuomi@open-xchange.com>
> <mailto:aki.tuomi@open-xchange.com
> <mailto:aki.tuomi@open-xchange.com>>> ha
> > scritto:
> >
> >
> > On 21.12.2018 14.49, Giacomo wrote:
> > > I'm running the following:
> > >
> > > # 2.3.4 (0ecbaf23d): /usr/local/etc/dovecot/dovecot.conf
> > > # OS: FreeBSD 11.2-RELEASE-p4 amd64
> > > # FS: ZFS
> > >
> > > auth_mechanisms = plain login
> > > auth_username_format = %Ln
> > > listen = *
> > > mail_location = maildir:~/Maildir
> > > namespace inbox {
> > > inbox = yes
> > > location =
> > > mailbox Drafts {
> > > auto = subscribe
> > > special_use = \Drafts
> > > }
> > > mailbox Junk {
> > > auto = subscribe
> > > special_use = \Junk
> > > }
> > > mailbox Sent {
> > > special_use = \Sent
> > > }
> > > mailbox Trash {
> > > auto = subscribe
> > > special_use = \Trash
> > > }
> > > prefix =
> > > }
> > > passdb {
> > > driver = pam
> > > }
> > > protocols = imap lmtp
> > > service auth {
> > > unix_listener /var/spool/postfix/private/auth {
> > > group = postfix
> > > mode = 0666
> > > user = postfix
> > > }
> > > user = dovecot
> > > }
> > > service imap-login {
> > > inet_listener imap {
> > > port = 0
> > > }
> > > }
> > > service lmtp {
> > > unix_listener /var/spool/postfix/private/dovecot-lmtp {
> > > group = postfix
> > > mode = 0600
> > > user = postfix
> > > }
> > > }
> > > service stats {
> > > unix_listener stats-reader {
> > > group =
> > > mode = 0600
> > > user =
> > > }
> > > unix_listener stats-writer {
> > > group = $default_internal_group
> > > mode = 0666
> > > user =
> > > }
> > > user = $default_internal_user
> > > }
> > > ssl_cert = </root/cert.pem
> > > ssl_key = # hidden, use -P to show it
> > > userdb {
> > > driver = passwd
> > > }
> > >
> > > dmesg shows:
> > >
> > > pid 74441 (imap), uid 1002: exited on signal 6
> > > pid 74784 (imap), uid 1002: exited on signal 6
> > > pid 21471 (imap), uid 1002: exited on signal 6
> > > pid 21470 (imap), uid 1002: exited on signal 6
> > > pid 21464 (imap), uid 1002: exited on signal 6
> > > pid 21731 (imap), uid 1002: exited on signal 6
> > >
> > > Sometimes the dovecot process serving an user crashes.
> He runs
> > mostly
> > > airmail on macOS and samsung mail on Android.
> > >
> > > Happens only to that particular user.
> > >
> > > The log shows the following: (maillog)
> > >
> > > Dec 16 14:52:35 mail dovecot: imap-login: Login:
> user=<USER>,
> > > method=PLAIN, rip=79.12.201.157, lip=192.168.1.28,
> mpid=74779, TLS,
> > > session=<wMQI+iN9VtRPDMmd>
> > > Dec 16 14:52:39 mail dovecot:
> imap(USER)<74441><nLa+7SN9+fhPDMmd>:
> > > Panic: file charset-iconv.c: line 83
> (charset_to_utf8_try):
> > assertion
> > > failed: (srcleft <= CHARSET_MAX_PENDING_BUF_SIZE)
> > > Dec 16 14:52:39 mail dovecot:
> imap(USER)<74441><nLa+7SN9+fhPDMmd>:
> > > Fatal: master: service(imap): child 74441 killed with
> signal 6 (core
> > > not dumped -
> https://dovecot.org/bugreport.html#coredumps - set
> > > service imap { drop_priv_before_exec=yes })
> > >
> > > I'm here if more info is needed.
> > >
> > > Thanks for taking a look.
> >
> >
> > Can you somehow get a core file and get backtrace from it?
> >
> >
> > Aki
> >
>