dovecot - Nov 2011 - POP3/IMAP crash signal 10

Hi,

I'm building a Postfix/Dovecot mail server and while I am able to
send/receive emails using telnet, after establishing a connection to Dovecot via
a client (Mail Live, Thunderbird etc) the following appears in the logs:


Nov 28 14:11:02 mailserver dovecot: [ID 583609 mail.info] pop3-login: Login:
user=<user at domain.com>, method=PLAIN, rip=xxx.xxx.xxx.xxx,
lip=xxx.xxx.xxx.xxx, mpid=282
78
Nov 28 14:11:02 mailserver dovecot: [ID 583609 mail.error] master: Error:
service(pop3-login): child 28277 killed with signal 10 (core not dumped - set
service pop3-log
in { drop_priv_before_exec=yes })
Nov 28 14:11:02 mailserver dovecot: [ID 583609 mail.info] pop3(user at
domain.com): Disconnected: Logged out top=0/0, retr=0/0, del=0/5, size=3250


I also experience very poor connectivity to the server, with Microsoft Mail and
Thunderbird regularly failing to connect (connection errors in the client and no
login attempt in the dovecot logs). I assume this is related to the issue above.

I am running dovecot 2.0.16 on Solaris 10 SPARC using a ZFS filesystem for
mailbox storage.

Here is my configuration:

# 2.0.16: /usr/local/etc/dovecot/dovecot.conf
# OS: SunOS 5.10 sun4u  zfs
auth_mechanisms = plain login
disable_plaintext_auth = no
mail_location = maildir:/storage0/home/vmail/%d/%n/Maildir
mail_plugins = quota
passdb {
  args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
plugin {
  quota = maildir:User quota
  quota_rule = *:storage=1G
}
postmaster_address = root at domain.com
sendmail_path = /usr/lib/sendmail
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem
userdb {
  args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
protocol imap {
  mail_plugins = quota quota imap_quota
}
protocol lda {
  mail_plugins = quota quota
}
protocol pop3 {
  mail_plugins = quota quota
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
}


I'm tearing my hair out! Hopefully someone can see something I'm missing

On Mon, 2011-11-28 at 03:24 +0000, Patrick Wood wrote:
> Nov 28 14:11:02 mailserver dovecot: [ID 583609 mail.error] master: Error:
service(pop3-login): child 28277 killed with signal 10 (core not dumped - set
service pop3-log
> in { drop_priv_before_exec=yes })
You can easily reproduce this? gdb backtrace is needed to get anything
useful out of this crash. Try with:

service pop3-login {
  executable = pop3-login -D
  drop_priv_before_exec = yes
}

Now when it crashes, it hopefully says that it's dumping a core
(to /usr/local/var/run/dovecot/login/core)? If not, try attaching gdb
directly to the process:

service pop3-login {
  process_min_avail = 1
  service_count = 0
}

gdb /usr/local/libexec/dovecot/pop3-login <pid of pop3-login>
cont
<make it crash>
bt full