On Sat, Oct 30, 2021 at 7:10 PM Hanns Mattes <hanns@hannsmattes.de> wrote:

Hi,

after upgrading Freebsd from ports dovecot is throwing the following error

Oct 30 18:04:15 freebsd dovecot[59232]:
doveadm(xxx@example.com)<84061><S3CoJf9sfWFdSAEAUmejdw>: Fatal: master:
service(doveadm): child 84061 killed with signal 6 (core not dumped -
https://dovecot.org/bugreport.html#coredumps - set service doveadm {
drop_priv_before_exec=yes })

I (surely) may have missed something while upgrading (I've learned a lot
about backup/snapshot-strategies with zfs, but to late to apply).

How can I debug the erro?

Regards Hanns

The "service doveadm { drop_priv_before_exec=yes }" bit should go into /usr/local/etc/dovecot/conf.d/10-master.conf.

Append the bit I have quoted into that file and then restart dovecot.

What command is it that you are running with doveadm?

The also run the following commands (as root):

sysctl -w kern.sugid_coredump=1

sysctl -w kern.corefile=/var/coredumps/%U.%N.core

mkdir /var/coredumps

chown -R 1777 /var/coredumps

The next time you get that fatal error, you'll probably find a file in /var/coredumps/

You can then obtain a backtrace from it:

gdb /usr/local/bin/doveadm /var/coredumps/FILENAME <ENTER>

bt full <ENTER>

Present the output, together with that from 'doveconf -n'.

HTH

Best regards,
Odhiambo WASHINGTON,
Nairobi,KE
+254 7 3200 0004/+254 7 2274 3223
"Oh, the cruft.", egrep -v '^$|^.*#' :-)