Hi! Can you try follow this guide to get a core dump
https://www.dovecot.org/bugreport-mail then provide gdb /usr/lib/dovecot/auth /path/to/core bt full on it. Would help narrowing down that bug. Also doveconf -n could be useful. Aki On 12.11.2019 9.19, Frank Elsner wrote: > On Tue, 12 Nov 2019 00:17:28 +0100 Frank Elsner via dovecot wrote: >> On Mon, 11 Nov 2019 23:47:27 +0100 Frank Elsner via dovecot wrote: > [ ... ] > >> I narrowed the probelem down to the warnings >> >> Warning: service auth { client_limit=128 } is lower than required under max. >> load (768) >> Warning: service anvil { client_limit=256 } is lower than required under >> max. load (643) > These messages disappear after changes in the auth and anvil config but I ran > into the following problem: > > dovecot[355234]: master: Dovecot v2.2.36.4 (baf9232c1) starting up for imap > dovecot[355234]: master: Error: service(auth): command startup failed, > throttling for 2 secs > dovecot[355237]: auth: Fatal: master: service(auth): child 355242 killed with > signal 11 (core dumped) > dovecot[355234]: master: Error: service(auth): command startup failed, > throttling for 4 secs > dovecot[355237]: auth: Fatal: master: service(auth): child 355256 killed with > signal 11 (core dumped) > dovecot[355234]: master: Error: service(auth): command startup failed, > throttling for 8 secs > dovecot[355237]: auth: Fatal: master: service(auth): child 355271 killed with > signal 11 (core dumped) > dovecot[355234]: master: Error: service(auth): command startup failed, > throttling for 16 secs > dovecot[355237]: auth: Fatal: master: service(auth): child 355285 killed with > signal 11 (core dumped) > dovecot[355234]: master: Warning: Killed with signal 15 (by pid=1 uid=0 > code=kill) > dovecot[355237]: imap-login: Warning: Killed with signal 15 (by pid=1 uid=0 > code=kill) > dovecot[355237]: anvil: Warning: Killed with signal 15 (by pid=1 uid=0 > code=kill) > dovecot[355237]: config: Warning: Killed with signal 15 (by pid=1 uid=0 > code=kill) > dovecot[355237]: log: Warning: Killed with signal 15 (by pid=1 uid=0 > code=kill) > > I guess the solution is simple but I can't find it :-( > > > --Frank >