[Dovecot] maildir_uidlist_create assertion failure

[Andrew Garner]

I've been getting the following error fairly often, which tends to
result in a corrupted dovecot-uidlist.

dovecot: IMAP(example at example.com): file maildir-uidlist.c: line 1009
(maildir_uidlist_recreate): assertion failed: (file_size ==
(uoff_t)st.st_size)
dovecot: IMAP(example at example.com): Raw backtrace: imap [0x80cb740] ->
imap [0x80cb64a] -> imap [0x8070e58] -> imap(maildir
_uidlist_sync_deinit+0xe8) [0x8072d18] -> imap [0x806e9e2] ->
imap(maildir_storage_sync_init+0x66) [0x806edf6] ->
imap(imap_sync_init+0x4a) [0x80657da] -> ima p(cmd_sync+0x9d)
[0x806590d] -> imap(cmd_store+0x33d) [0x805e1ed] -> imap(cmd_uid+0x57)
[0x805e737] -> imap [0x805f009] -> imap [0x805f0ae] -> imap(client_inp
ut+0x65) [0x805f6c5] -> imap(io_loop_handler_run+0x162) [0x80d3022] ->
imap(io_loop_run+0x28) [0x80d2368] -> imap(main+0x4ab) [0x806723b] ->
/lib/tls/i686/cmo v/libc.so.6(__libc_start_main+0xc8) [0xb7dfdea8] ->
imap [0x8059551]
dovecot: child 17997 (imap) killed with signal 6
dovecot: IMAP(example at example.com):
rename(/home/vmail/domains/o/example.com/U/example/Maildir/dovecot-uidlist.tmp,
/home/vmail/domains/o/example.com/U/example/Maildir/dovecot-uidlist)
failed: No such file or directory
dovecot: IMAP(example at example.com):
unlink(/home/vmail/domains/o/example.com/U/example/Maildir/dovecot-uidlist.tmp)
failed: No such file or directory
dovecot: IMAP(example at example.com):
rename(/home/vmail/domains/o/example.com/U/example/Maildir/dovecot-uidlist.tmp,
/home/vmail/domains/o/example.com/U/example/Maildir/dovecot-uidlist)
failed: No such file or directory
dovecot: IMAP(example at example.com):
unlink(/home/vmail/domains/o/example.com/U/example/Maildir/dovecot-uidlist.tmp)
failed: No such file or directory

Followed sometime later by:
dovecot: IMAP(example at example.com): Invalid data in file
/home/vmail/domains/o/example.com/U/example/Maildir/dovecot-uidlist

Example of some corruption:
~/Maildir/dovecot-uidlist
...
7879 W193997 1195126451.4452.server023,S=191173:2,aopr
:1195126451.4452.server023,S=191173:2,aopr
...
9628 W665454 1197354124.5254.server019,S=651976:2,pr <A0>%
:1197354124.5254.server019,S=651976:2,pr


# dovecot -n
# 1.1.beta11: /etc/dovecot/dovecot.conf
base_dir: /var/run/dovecot/
protocols: imap imaps pop3 pop3s
login_dir: /var/run/dovecot/login
login_executable(default): /usr/lib/dovecot/imap-login
login_executable(imap): /usr/lib/dovecot/imap-login
login_executable(pop3): /usr/lib/dovecot/pop3-login
verbose_proctitle: yes
mail_uid: 89
mail_gid: 89
mail_location: maildir:~/Maildir
mail_debug: yes
mmap_disable: yes
mail_nfs_storage: yes
mail_nfs_index: yes
mail_executable(default): /usr/lib/dovecot/rawlog /usr/lib/dovecot/imap
mail_executable(imap): /usr/lib/dovecot/rawlog /usr/lib/dovecot/imap
mail_executable(pop3): /usr/lib/dovecot/pop3
mail_plugins(default): fts fts_squat
mail_plugins(imap): fts fts_squat
mail_plugins(pop3):
mail_plugin_dir(default): /usr/lib/dovecot/modules/imap/
mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap/
mail_plugin_dir(pop3): /usr/lib/dovecot/modules/
imap_client_workarounds(default): delay-newmail
imap_client_workarounds(imap): delay-newmail
imap_client_workarounds(pop3):
pop3_uidl_format(default): %08Xu%08Xv
pop3_uidl_format(imap): %08Xu%08Xv
pop3_uidl_format(pop3): %f
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
auth default:
  mechanisms: login plain cram-md5 digest-md5
  username_format: %Lu
  verbose: yes
  debug: yes
  passdb:
    driver: sql
    args: /etc/dovecot/dovecot-sql.conf
  userdb:
    driver: sql
    args: /etc/dovecot/dovecot-sql.conf
  socket:
    type: listen
    client:
      path: /var/spool/postfix/private/auth
      user: postfix
      group: postfix
    master:
      path: /var/run/dovecot/auth-master
      user: vmail
      group: vmail
plugin:
  quota: maildir
  quota_rule: *:storage=102400:messages=30000
  fts: squat