dovecot - Oct 2011 - Restarting dovecot periodically fails with "Socket already exists: /var/run/dovecot/anvil"

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Hello

restarting dovecot regularly fails with version 2.0.13 on Ubuntu 11.10
due to a running child process exiting after the main dovecot process.

Oct 13 15:04:58 ubuntu dovecot: master: Error: service(anvil): Socket
already exists: /var/run/dovecot/anvil
Oct 13 15:04:58 ubuntu dovecot: master: Error: service(anvil): Socket
already exists: /var/run/dovecot/anvil-auth-penalty
Oct 13 15:04:58 ubuntu dovecot: master: Fatal: Failed to start listeners
Oct 13 15:04:58 ubuntu kernel: [11132.825253] init: dovecot main
process (8668) terminated with status 89

The dovecot/anvil process appears to be the cause of the problem
(snapshot of running dovecot processes just after main dovecot process
stops):

root 8418 8080 0 15:02 pts/0 00:00:00 stop dovecot
root 8419 1 0 15:02 ? 00:00:00 dovecot/anvil
root 8422 8420 0 15:02 ? 00:00:00 grep dovecot

This is an Ubuntu specific issue as we use upstart to manage dovecot
which monitors the status of the main dovecot process; the Debian init
script appears to make provision for this happening.

I can work around this in the upstart configuration but it does look
like a potential bug in the sub-process handling in dovecot.

Any help much appreciated - please feel free to comment on
https://bugs.launchpad.net/ubuntu/+source/dovecot/+bug/873390 as well.

Regards

- -- 
James Page
Ubuntu Core Developer

- -----------------------------------

dovecot -n

# 2.0.13: /etc/dovecot/dovecot.conf
# OS: Linux 3.0.0-12-generic-pae i686 Ubuntu 11.10
mail_location = maildir:~/Maildir
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope
encoded-character vacation subaddress comparator-i;ascii-numeric
relational regex imap4flags copy include variables body enotify
environment mailbox date
passdb {
  driver = pam
}
plugin {
  sieve = ~/.dovecot.sieve
  sieve_dir = ~/sieve
}
protocols = imap pop3 sieve
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_cipher_list
ALL:!LOW:!SSLv2:ALL:!aNULL:!ADH:!eNULL:!EXP:RC4+RSA:+HIGH:+MEDIUM
ssl_key = </etc/ssl/private/dovecot.pem
userdb {
  driver = passwd
}
protocol imap {
  imap_client_workarounds = delay-newmail
  mail_max_userip_connections = 10
}
protocol pop3 {
  mail_max_userip_connections = 10
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
}
protocol lda {
  deliver_log_format = msgid=%m: %$
  mail_plugins = sieve
  postmaster_address = postmaster
  quota_full_tempfail = yes
  rejection_reason = Your message to <%t> was automatically rejected:%n%r
}


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On Thu, 2011-10-13 at 16:13 +0100, James Page wrote:
> restarting dovecot regularly fails with version 2.0.13 on Ubuntu 11.10
> due to a running child process exiting after the main dovecot process.
> 
> Oct 13 15:04:58 ubuntu dovecot: master: Error: service(anvil): Socket
> already exists: /var/run/dovecot/anvil
> This is an Ubuntu specific issue as we use upstart to manage dovecot
> which monitors the status of the main dovecot process; the Debian init
> script appears to make provision for this happening.
http://hg.dovecot.org/dovecot-2.1/rev/6894298ae5fd should apply to v2.0
as well, but since it's a bit large change I don't know if I should
backport it, at least without some more testing.