Amavis падает по неизвестной причине

Amavis вылетает по неизвестной причине. К счастью, у нас установлен Monit, и он перезапускает службу в течение минуты, но это всего лишь бандаж в решении проблемы. Нам нужно решить настоящую проблему.

Непосредственно перед сбоем в журнале существуют следующие записи: /var/log/syslog:

Feb 22 17:02:20 hoa systemd[1]: Stopping LSB: Starts amavisd-new mailfilter...
Feb 22 17:02:20 hoa amavis[23039]: (23039-01) (!)TempDir removal: tempdir is to be PRESERVED: /var/lib/amavis/tmp/amavis-20170222T170218-23039-CLjT8mUN
Feb 22 17:02:20 hoa amavis[22755]: (22755-08) (!)TempDir removal: tempdir is to be PRESERVED: /var/lib/amavis/tmp/amavis-20170222T170035-22755-v7F3P0kr
Feb 22 17:02:20 hoa amavis[21924]: (21924-20) (!)TempDir removal: tempdir is to be PRESERVED: /var/lib/amavis/tmp/amavis-20170222T165050-21924-Vi1AOnu5
Feb 22 17:02:20 hoa amavis[22053]: (22053-14) (!)TempDir removal: tempdir is to be PRESERVED: /var/lib/amavis/tmp/amavis-20170222T165124-22053-V_dDmOmV
Feb 22 17:02:20 hoa postfix/10025/smtpd[22719]: disconnect from localhost[127.0.0.1]
Feb 22 17:02:20 hoa postfix/10025/smtpd[22759]: disconnect from localhost[127.0.0.1]
Feb 22 17:02:20 hoa postfix/10025/smtpd[22718]: disconnect from localhost[127.0.0.1]
Feb 22 17:02:20 hoa postfix/smtp-amavis/smtp[22710]: B07E111FD54: to=<user1@example.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=17, delays=0.23/14/0.31/2.3, dsn=4.3.2, status=deferred (host 127.0.0.1[127.0.0.1] said: 421 4.3.2 Service shutting down, closing channel (in reply to end of DATA command))
Feb 22 17:02:20 hoa postfix/smtp-amavis/smtp[22710]: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused
Feb 22 17:02:20 hoa postfix/smtp-amavis/smtp[22709]: B07E111FD54: to=<user2@example.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=17, delays=0.23/14/0.08/2.6, dsn=4.3.2, status=deferred (host 127.0.0.1[127.0.0.1] said: 421 4.3.2 Service shutting down, closing channel (in reply to end of DATA command))
Feb 22 17:02:20 hoa postfix/smtp-amavis/smtp[22709]: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused
Feb 22 17:02:20 hoa postfix/smtp-amavis/smtp[22708]: BFF1D11FD58: to=<user3@example.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=17, delays=0.23/15/0.03/2.2, dsn=4.3.2, status=deferred (host 127.0.0.1[127.0.0.1] said: 421 4.3.2 Service shutting down, closing channel (in reply to end of DATA command))
Feb 22 17:02:20 hoa postfix/smtp-amavis/smtp[22708]: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused
Feb 22 17:02:20 hoa postfix/smtp-amavis/smtp[22707]: 8CDCC11FCF4: to=<user4@example.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=17, delays=0.38/14/0.11/2.6, dsn=4.3.2, status=deferred (host 127.0.0.1[127.0.0.1] said: 421 4.3.2 Service shutting down, closing channel (in reply to end of DATA command))
Feb 22 17:02:20 hoa postfix/smtp-amavis/smtp[22707]: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused
Feb 22 17:02:20 hoa postfix/smtp-amavis/smtp[22710]: BFF1D11FD58: to=<user5@example.com>, relay=none, delay=17, delays=0.23/17/0/0, dsn=4.4.1, status=deferred (connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)
Feb 22 17:02:20 hoa postfix/smtp-amavis/smtp[22707]: 16B531207A6: to=<user6@example.com>, relay=none, delay=17, delays=0.42/17/0/0, dsn=4.4.1, status=deferred (connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)
Feb 22 17:02:20 hoa postfix/smtp-amavis/smtp[22710]: 16B531207A6: to=<user7@example.com>, relay=none, delay=17, delays=0.42/17/0/0, dsn=4.4.1, status=deferred (connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)
Feb 22 17:02:20 hoa postfix/smtp-amavis/smtp[22709]: E9CA411F8BA: to=<user8@example.com>, relay=none, delay=4.9, delays=0.53/4.4/0/0, dsn=4.4.1, status=deferred (connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)
Feb 22 17:02:20 hoa postfix/smtp-amavis/smtp[22708]: E9CA411F8BA: to=<user9@example.com>, relay=none, delay=4.9, delays=0.53/4.4/0/0, dsn=4.4.1, status=deferred (connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)
Feb 22 17:02:20 hoa amavis[23084]: Stopping amavisd: amavisd-new.
Feb 22 17:02:20 hoa systemd[1]: Stopped LSB: Starts amavisd-new mailfilter.
Feb 22 17:02:21 hoa systemd[1]: Starting LSB: Starts amavisd-new mailfilter...

В этот момент включается Monit, и Amavis перезапускается.

Я довольно много поискал, но не могу найти проблему. Возможно, серверу не хватает памяти, но, похоже, не регистрируется никаких ошибок, связанных с невозможностью выделить память. Поэтому я не уверен, действительно ли это проблема или нет.

Любая помощь будет оценена.