dovecot - Jan 2010 - No filelocking at "shared-mailboxes" dictionary?

Using imapsync I changed many ACLs on many accounts simultaneously in 
four concurrent IMAP-sessions.

I started with an empty file "shared-mailboxes". But after the sync
the
file "shared-mailboxes" has been crashed. I found broken lines and
I'm
missing some entrys. 

Is it possible  that there's no filelocking on that file?

I used the ext3 filesystem.


That's what shred-mailboxes looks like at the moment:

shared/shared-box
1
shared/shared-boxes/user/user1.example.com/user2.example.com
1
.example.com/user5.example.com
1
hared/shared-boxes/user/user6.example.com/user4.example.c2442203233424^?
1
ser/user7.example.com/user2.example.com


Peer


dovecot -n:
# 1.2.9: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.27.39-0.2-default x86_64 openSUSE 11.1 (x86_64) 
protocols: imap imaps managesieve                               
ssl_cert_file: /etc/ssl/old.pem                                 
ssl_key_file: /etc/ssl/old.pem                                  
shutdown_clients: no                                            
login_dir: /var/run/dovecot/login                               
login_executable(default): /usr/lib/dovecot/imap-login          
login_executable(imap): /usr/lib/dovecot/imap-login             
login_executable(managesieve): /usr/lib/dovecot/managesieve-login
login_process_per_connection: no                                 
login_max_processes_count: 512                                   
max_mail_processes: 1024                                         
mail_max_userip_connections(default): 40                         
mail_max_userip_connections(imap): 40                            
mail_max_userip_connections(managesieve): 10                     
verbose_proctitle: yes                                           
mail_uid: vmail                                                  
mail_gid: vmail                                                  
mail_location: maildir:~/Maildir                                 
mail_executable(default): /usr/lib/dovecot/imap-usernamenmigration
mail_executable(imap): /usr/lib/dovecot/imap-usernamenmigration   
mail_executable(managesieve): /usr/lib/dovecot/managesieve        
mail_plugins(default): quota imap_quota acl imap_acl              
mail_plugins(imap): quota imap_quota acl imap_acl                 
mail_plugins(managesieve):                                        
mail_plugin_dir(default): /usr/lib64/dovecot/modules/imap         
mail_plugin_dir(imap): /usr/lib64/dovecot/modules/imap            
mail_plugin_dir(managesieve): /usr/lib64/dovecot/modules/managesieve
namespace:                                                          
  type: private                                                     
  separator: /                                                      
  inbox: yes                                                        
  list: yes                                                         
  subscriptions: yes                                                
namespace:                                                          
  type: shared                                                      
  separator: /                                                      
  prefix: zz_SHARED_ACCOUNTS/%%u/
  location: maildir:%%h/Maildir:INDEX=~/Maildir/shared/%%u
  list: yes
lda:
  postmaster_address: postmaster at iea-dpc.org
  mail_plugins: quota acl sieve
  mail_plugin_dir: /usr/lib64/dovecot/modules/lda
  quota_full_tempfail: yes
auth default:
  mechanisms: plain login digest-md5 cram-md5
  verbose: yes
  debug: yes
  debug_passwords: yes
  passdb:
    driver: passwd-file
    args: /etc/dovecot/userdb
  userdb:
    driver: passwd-file
    args: /etc/dovecot/userdb
  userdb:
    driver: static
    args: uid=5001 gid=5001
  socket:
    type: listen
    client:
      path: /var/spool/postfix/private/auth
      mode: 432
      user: postfix
      group: postfix
    master:
      path: /var/run/dovecot/auth-master
      mode: 432
      user: vmail
      group: vmail
plugin:
  quota: maildir
  quota_rule: *:storage=102400
  acl: vfile
  acl_shared_dict: file:/var/lib/dovecot/shared-mailboxes
  sieve: ~/.dovecot.sieve
  sieve_dir: ~/sieve


-- 
Heinlein Professional Linux Support GmbH
Linux: Akademie - Support - Hosting

http://www.heinlein-support.de
Tel: 030 / 40 50 51 - 0
Fax: 030 / 40 50 51 - 19

Zwangsangaben lt. ?35a GmbHG:
HRB 93818 B / Amtsgericht Berlin-Charlottenburg,
Gesch?ftsf?hrer: Peer Heinlein  -- Sitz: Berlin

On 19.1.2010, at 1.21, Peer Heinlein wrote:
> I started with an empty file "shared-mailboxes". But after the
sync the
> file "shared-mailboxes" has been crashed. I found broken lines
and I'm
> missing some entrys. 
> 
> Is it possible  that there's no filelocking on that file?
The file is always created by creating a temporary file, locking the file by
link()ing it to a dotlock file, reading existing data, applying changes, and
writing the data to it and then rename()ing it over the original file. There
isn't really any way to corrupt data inside the file, because the whole file
is always recreated.
> hared/shared-boxes/user/user6.example.com/user4.example.c2442203233424^?
> 1
> ser/user7.example.com/user2.example.com
If it's a Dovecot bug, it's more likely a memory corruption problem. I
don't see any obvious reasons though. Can you easily reproduce this? Running
via valgrind could be interesting then.