dovecot - Dec 2013 - dovecot.index-Errors with multiple IMAP client access in Dovecot 2.2

Hello list,

I hope you can help me!

My self-compiled dovecot 2.2.6 (and the two minor versions before, too) 
throws that errors:

Nov 28 18:29:00 mailserv dovecot: imap(martin at example.com): Error: 
Transaction log /srv/vmail/example.com/martin/Maildir/dovecot.index.log: 
duplicate transaction log sequence (25)
Nov 28 18:29:00 mailserv dovecot: imap(martin at example.com): Error: 
/srv/vmail/example.com/martin/Maildir/dovecot.index log position went 
backwards (24,40 < 25,10028)

... and so on ... duplicate transaction log sequences and backwards gone 
log positions, and this always, when I use at least two IMAP clients at 
the same time (better: the two clients are online and logged in at the 
same time).

That happens only with one user (me ;-) ), the other about 15 users on 
this server are having no problems.

What I see: the clients are bothering each other, but I don't know, why.

I thought about the used reiserfs filesystem on the server, but there 
were no problems with 1.2 on the same server.

Some words about my client setup: I use Thunderbird and iPhone at the 
same time, and as a third client on the same Server there is a 
Thunderbird instance at my company, which runs parallel to the other 
two. Seems to be weired, but isn't really (IMHO ;-) ).
Sometimes there are two TBs at the same mailbox, sometimes only the 
iPhone and a TB, sometimes all three.

This runs quite good for long time with dovecot 1.2 and 2.1.x (the last 
one at my company in a similary setup with more users and several 
clients at the same time).


Maybe there is an error by using "my" build configurations (I think,
not)?

---- configures -------------------

./configure \
--prefix=/usr/local \
--with-sql \
--with-ssl \
--with-mysql

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

Here are my dovecot.conf (only the changes of defaults) - maybe there is 
a misconfiguration?

---- dovecot.conf -----------------

# 2.2.6: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.18-028stab101.1 x86_64 Ubuntu 10.04.4 LTS reiserfs
auth_master_user_separator = *
auth_mechanisms = plain login
auth_socket_path = /usr/local/var/run/dovecot/auth-master
default_internal_user = vmail
default_login_user = vmail
dict {
   acl = mysql:/etc/dovecot/dovecot-dict-acl-sql.conf.ext
}
disable_plaintext_auth = no
imap_capability = +NAMESPACE
imap_client_workarounds = delay-newmail tb-lsub-flags tb-lsub-flags 
tb-extra-mailbox-sep
listen = *
log_timestamp = "%Y-%m-%d %H:%M:%S "
login_log_format_elements = user=<%u> method=%m rip=%r lip=%l %c
mail_access_groups = vmail
mail_location = maildir:/srv/vmail/%d/%n/Maildir
mail_privileged_group = vmail
mail_uid = vmail
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 ihave imapflags notify
namespace {
   list = yes
   location = maildir:%%Lh/Maildir/:INDEX=%%Lh/shared-idx/%%u
   prefix = shared/%%u/
   separator = /
   subscriptions = no
   type = shared
}
namespace {
   hidden = no
   list = yes
   location = maildir:/srv/vmail/public
   prefix = public/
   separator = /
   subscriptions = no
   type = public
}
namespace inbox {
   hidden = no
   inbox = yes
   list = yes
   location    mailbox Drafts {
     auto = subscribe
     special_use = \Drafts
   }
   mailbox Junk {
     auto = subscribe
     special_use = \Junk
   }
   mailbox Sent {
     auto = subscribe
     special_use = \Sent
   }
   mailbox "Sent Messages" {
     auto = subscribe
     special_use = \Sent
   }
   mailbox Spam {
     auto = subscribe
     special_use = \Junk
   }
   mailbox Trash {
     auto = subscribe
     special_use = \Trash
   }
   prefix    separator = /
   subscriptions = yes
   type = private
}
passdb {
   args = /etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
plugin {
   acl = vfile
   acl_shared_dict = proxy::acl
   autocreate = Trash
   autocreate2 = Spam
   autocreate3 = Sent
   autocreate4 = Drafts
   autosubscribe = Trash
   autosubscribe2 = Spam
   autosubscribe3 = Sent
   autosubscribe4 = Drafts
   sieve = ~/.dovecot.sieve
   sieve_after = /srv/vmail/sieve/after.sieve
   sieve_before = /srv/vmail/sieve/before.sieve
   sieve_dir = ~/sieve
   sieve_extensions = +notify +imapflags
   sieve_global_dir = /srv/vmail/sieve
   sieve_global_path = /srv/vmail/sieve/globalsieverc
}
pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
postmaster_address = postmaster@%d
protocols = imap pop3
quota_full_tempfail = yes
service auth {
   unix_listener /var/spool/postfix/private/auth {
     group = postfix
     mode = 0660
     user = postfix
   }
   unix_listener /var/spool/postfix/private/dovecot-auth {
     group = postfix
     mode = 0660
     user = postfix
   }
   unix_listener auth-master {
     group = vmail
     mode = 0600
     user = vmail
   }
   unix_listener auth-userdb {
     group = vmail
     mode = 0600
     user = vmail
   }
}
service dict {
   unix_listener dict {
     group = vmail
     mode = 0660
     user = vmail
   }
}
service imap-login {
   inet_listener imaps {
     port = 993
     ssl = yes
   }
}
service imap {
   process_limit = 2048
   vsz_limit = 256 M
}
service managesieve-login {
   inet_listener sieve {
     port = 4190
   }
   inet_listener sieve_deprecated {
     port = 2000
   }
}
service pop3-login {
   inet_listener pop3 {
     port = 110
   }
}
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 {
   args = /etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
protocol lda {
   mail_plugins = " sieve"
}
protocol imap {
   mail_plugins = acl imap_acl
}
protocol sieve {
   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 ihave imapflags
}

local 1.2.3.4 {
   ssl_cert = </etc/ssl/certs/dovecot.pem
   ssl_key = </etc/ssl/private/dovecot.pem
}


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

Thank you very much for your time and help!

Greetings,
    Martin

On 2.12.2013, at 22.25, Martin Rabl <martin.rabl at rablnet.de> wrote:
> My self-compiled dovecot 2.2.6 (and the two minor versions before, too)
throws that errors:
> 
> Nov 28 18:29:00 mailserv dovecot: imap(martin at example.com): Error:
Transaction log /srv/vmail/example.com/martin/Maildir/dovecot.index.log:
duplicate transaction log sequence (25)
> Nov 28 18:29:00 mailserv dovecot: imap(martin at example.com): Error:
/srv/vmail/example.com/martin/Maildir/dovecot.index log position went backwards
(24,40 < 25,10028)
These kind of errors typically happen with NFS and other shared filesystems when
there is some trouble with caching or locking.
> I thought about the used reiserfs filesystem on the server, but there were
no problems with 1.2 on the same server.
Well, might be .. It definitely shouldn?t be happening on local filesystems that
easily.

BTW. You could also try if you can very easily reproduce this with imaptest
against a test user: http://imapwiki.org/ImapTest It it immediately fails, try
mounting another filesystem and placing the test user?s mails there and if the
error continues.