Error: fcntl(write-lock) locking failed

Marcin Janowski marcin.janowski at monogo.pl
Mon Dec 14 18:39:42 UTC 2015 

Hello, one month ago I moved my smtp and imap server to other environment
with /var/vmail on NFS. After this move i have warnings about too long
"Locking transaction log", but today i have errors about "fcntl(write-lock)
locking failed ". What this means? This is my dovecot config:

# 2.2.9: /etc/dovecot/dovecot.conf
doveconf: Warning: service auth { client_limit=1000 } is lower than
required under max. load (2000)
doveconf: Warning: service anvil { client_limit=1000 } is lower than
required under max. load (1603)
# OS: Linux 3.19.0-31-generic x86_64 Ubuntu 14.04.3 LTS nfs
auth_mechanisms = plain login
auth_worker_max_count = 300
default_process_limit = 400


mail_location = maildir:/var/vmail/%d/%n/Maildir


mail_plugins = zlib


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



namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix =
}
passdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
plugin {
  sieve = ~/.dovecot.sieve
  sieve_default = /var/vmail/globalsieverc
  sieve_dir = ~/sieve
}
postmaster_address = postmaster at smtp.DOMAIN
protocols = " imap lmtp sieve pop3"
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0666
    user = vmail
  }
}
service imap {
  process_limit = 1024
}
ssl_cert = </etc/ssl/private/DOMAIN.crt
ssl_key = </etc/ssl/private/DOMAIN.key
userdb {
  args = uid=vmail gid=vmail home=/var/vmail/%d/%n
  driver = static
}
protocol lda {
  mail_plugins = zlib sieve
}
protocol imap {
  mail_max_userip_connections = 100
}

And this is errors from few day:

2015-12-14 15:33:35 1450103615 Dec 14 15:32:44 smtp-atena dovecot:
imap(...): Error: fcntl(write-lock) locking failed for file
/var/vmail/.../Maildir/dovecot.index.log: No locks available
Dec 14 15:32:44 smtp-atena dovecot: imap(...): Error:
mail_index_wait_lock_fd() failed with file
/var/vmail/.../Maildir/dovecot.index.log: No locks available
2015-12-14 12:36:35 1450092995 Dec 14 12:36:06 smtp-atena dovecot:
imap(...): Error: fcntl(write-lock) locking failed for file
/var/vmail/.../Maildir/dovecot.index.log: No locks available
Dec 14 12:36:06 smtp-atena dovecot: imap(...): Error:
mail_index_wait_lock_fd() failed with file
/var/vmail/.../Maildir/dovecot.index.log: No locks available
2015-12-14 12:18:35 1450091915 Dec 14 12:18:25 smtp-atena dovecot:
imap(...): Error: fcntl(write-lock) locking failed for file
/var/vmail/.../Maildir/dovecot.index.log: No locks available
Dec 14 12:18:25 smtp-atena dovecot: imap(...): Error:
mail_index_wait_lock_fd() failed with file
/var/vmail//Maildir/dovecot.index.log: No locks available
Dec 14 12:18:25 smtp-atena dovecot: imap(...): Error: fcntl(write-lock)
locking failed for file /var/vmail/.../Maildir/dovecot.index.log: No locks
available
Dec 14 12:18:25 smtp-atena dovecot: imap(...): Error:
mail_index_wait_lock_fd() failed with file
/var/vmail/.../Maildir/dovecot.index.log: No locks available
2015-12-14 09:10:35 1450080635 Dec 14 09:10:19 smtp-atena dovecot:
imap(...): Error: fcntl(write-lock) locking failed for file
/var/vmail/.../Maildir/dovecot.index.cache: No locks available
2015-12-13 13:40:35 1450010435 Dec 13 13:40:06 smtp-atena dovecot:
imap(...): Error: fcntl(write-lock) locking failed for file
/var/vmail/.../Maildir/dovecot.index.log: No locks available
Dec 13 13:40:06 smtp-atena dovecot: imap(...): Error:
mail_index_wait_lock_fd() failed with file
/var/vmail/.../Maildir/dovecot.index.log: No locks available
2015-12-13 10:48:35 1450000115 Dec 13 10:48:19 smtp-atena dovecot:
imap(...): Error: fcntl(write-lock) locking failed for file
/var/vmail/.../Maildir/dovecot.index.log: No locks available
Dec 13 10:48:19 smtp-atena dovecot: imap(...): Error:
mail_index_wait_lock_fd() failed with file
/var/vmail/.../Maildir/dovecot.index.log: No locks available
2015-12-12 08:36:35 1449905795 Dec 12 08:36:30 smtp-atena dovecot:
imap(...): Warning: Locking transaction log file
/var/vmail/.../Maildir/dovecot.index.log took 60 seconds
Dec 12 08:36:31 smtp-atena dovecot: imap(...): Warning: Locking transaction
log file /var/vmail/.../Maildir/dovecot.index.log took 31 seconds
2015-12-12 08:35:35 1449905735 Dec 12 08:35:29 smtp-atena dovecot:
imap(...): Warning: Locking transaction log file
/var/vmail/.../Maildir/dovecot.index.log took 60 seconds
2015-12-12 08:34:36 1449905676 Dec 12 08:34:27 smtp-atena dovecot:
imap(...): Warning: Locking transaction log file
/var/vmail/.../Maildir/dovecot.index.log took 60 seconds
2015-12-11 11:48:36 1449830916 Dec 11 11:47:48 smtp-atena dovecot:
imap(...): Warning: Locking transaction log file
/var/vmail/.../Maildir/dovecot.index.log took 60 seconds
2015-12-11 08:55:35 1449820535 Dec 11 08:55:03 smtp-atena dovecot:
imap(...): Warning: Locking transaction log file
/var/vmail/.../Maildir/dovecot.index.log took 90 seconds
Dec 11 08:55:33 smtp-atena dovecot: imap(...): Warning: Locking transaction
log file /var/vmail/.../Maildir/dovecot.index.log took 120 seconds
Dec 11 08:55:33 smtp-atena dovecot: imap(...): Warning: Locking transaction
log file /var/vmail/.../Maildir/dovecot.index.log took 120 seconds
2015-12-11 08:54:35 1449820475 Dec 11 08:54:33 smtp-atena dovecot:
imap(...): Warning: Locking transaction log file
/var/vmail/.../Maildir/dovecot.index.log took 60 seconds
2015-12-11 08:53:35 1449820415 Dec 11 08:53:32 smtp-atena dovecot:
imap(...): Warning: Locking transaction log file
/var/vmail/.../Maildir/dovecot.index.log took 60 seconds
2015-12-11 08:52:35 1449820355 Dec 11 08:51:59 smtp-atena dovecot:
imap(...): Warning: Locking transaction log file
/var/vmail/.../Maildir/dovecot.index.log took 90 seconds
Dec 11 08:51:59 smtp-atena dovecot: imap(...): Warning: Locking transaction
log file /var/vmail/.../Maildir/dovecot.index.log took 90 seconds
2015-12-11 08:51:35 1449820295 Dec 11 08:51:29 smtp-atena dovecot:
imap(...): Warning: Locking transaction log file
/var/vmail/.../Maildir/dovecot.index.log took 60 seconds
Dec 11 08:51:29 smtp-atena dovecot: imap(...): Warning: Locking transaction
log file /var/vmail/.../Maildir/dovecot.index.log took 60 seconds

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