Frequent Out of Memory for service(config)

[Root Kev]

Hi Aki,

I put  in the line that you recommended as well as the " echo
'DAEMON_COREFILE_LIMIT="unlimited"' >> /etc/sysconfig/dovecot".
Unfortunately, the logs are saying that core dumps are still disabled.

May 17 13:30:17 config: Fatal: pool_system_malloc(8192): Out of memory
May 17 13:30:17 pop3(emx-echoworx): Error: Error reading configuration:
read(/var/run/dovecot/config) failed: EOF
May 17 13:30:17 config: Fatal: master: service(config): child 11530 killed
with signal 6 (core dumps disabled -
https://dovecot.org/bugreport.html#coredumps)

On Wed, May 15, 2019 at 4:34 AM Aki Tuomi <aki.tuomi at open-xchange.com>
wrote:

>
> On 13.5.2019 22.56, Root Kev via dovecot wrote:
> > Hello Group,
> >
> > We have dovecot deployed as solely a Pop3 service that is used by our
> > applications to pass mail from one application to another internally.
> > We have roughly 4 applications that connect to the Pop3 service every
> > 2 seconds, to check for new messages and pop them for processing if
> > they are present.  Depending on the site, we have between 1024-2048MB
> > of memory set for default_vsz_limit.  In all systems we see the Out of
> > memory alert several times a day. We previously did not see this at
> > all when running on CentOS6, with less memory.
> >
> > We have tried increasing the memory to the vsz_limit up to 2gb without
> > success.
> >
> > We are running on CentOS 7 servers, running dovecot 2.3.6 (7eab80676)
> > (from the dovecot repo).
> >
> > Can anyone advise any other settings that could be modified in order
> > to correct these out of memory issues?
> >
> > # dovecot -n
> > # 2.3.6 (7eab80676): /etc/dovecot/dovecot.conf
> > # OS: Linux 3.10.0-957.5.1.el7.x86_64 x86_64 CentOS Linux release
> > 7.6.1810 (Core)
> > # Hostname: ****** #<modified for security>
> > auth_cache_size = 10 M
> > auth_verbose = yes
> > default_vsz_limit = 1 G
> > instance_name = Pop3 Mail Service
> > listen = 10.*.*.* #<modified for security>
> > log_path = /var/log/dovecot.log
> > login_greeting = Pop3 Mail Service
> > login_trusted_networks = 10.*.*.* 10.*.*.* 10.*.*.* 10.*.*.* 10.*.*.*
> > #<modified for security>
> > mail_location = maildir:~/Maildir
> > namespace inbox {
> >   inbox = yes
> >   location =
> >   mailbox Drafts {
> >     special_use = \Drafts
> >   }
> >   mailbox Junk {
> >     special_use = \Junk
> >   }
> >   mailbox Sent {
> >     special_use = \Sent
> >   }
> >   mailbox "Sent Messages" {
> >     special_use = \Sent
> >   }
> >   mailbox Trash {
> >     special_use = \Trash
> >   }
> >   prefix =
> > }
> > passdb {
> >   args = cache_key=#hidden_use-P_to_show#
> >   driver = pam
> > }
> > protocols = pop3
> > ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
> > ssl_key = # hidden, use -P to show it
> > userdb {
> >   driver = passwd
> > }
> > verbose_ssl = yes
> >
> > May 10 06:44:05 config: Fatal: pool_system_malloc(8192): Out of memory
> > May 10 06:44:05 config: Fatal: master: service(config): child 27887
> > returned error 83 (Out of memory (service config { vsz_limit=1024 MB
> > }, you may need to increase it) - set CORE_OUTOFMEM=1 environment to
> > get core dump)
>
> Can you try setting
>
> import_environment = $import_environment CORE_OUTOFMEM=1
>
> and see if it causes coredump?
>
> Aki
>
>
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