[Dovecot] Kernel warnings

[Thomas Zajic]

Hi,

I've been getting these warnings in syslog since I've been running
(Linux) kernels 2.6.31.x and up (I'm currently at 2.6.32.2), they
do not show up on 2.6.30.x kernels.

Dovecot versions involved were/are 1.2.x, I'm currently at 1.2.9. My
system is running Slackware 13.0, but this also happened with 12.2.


------------[ cut here ]------------
WARNING: at fs/notify/inotify/inotify_fsnotify.c:129 idr_callback+0x2a/0x4b()
Hardware name: To Be Filled By O.E.M.
inotify closing but id=0 for entry=f61e3334 in group=f254ce00 still in idr.  Probably leaking memory
Modules linked in: tcp_diag inet_diag autofs4 nfsd lockd nfs_acl sunrpc exportfs ipv6 w83627hf hwmon_vid hwmon lp fuse parport_pc 8250_pnp rtc_cmos 8250 parport rtc_core serial_core rtc_lib ohci_hcd button thermal processor evdev e1000 psmouse serio_raw i2c_i801 ide_cd_mod sg i2c_core cdrom ehci_hcd
Pid: 10837, comm: imap Not tainted 2.6.32.2 #1
Call Trace:
 [<c1024368>] ? warn_slowpath_common+0x5e/0x8a
 [<c10243c6>] ? warn_slowpath_fmt+0x26/0x2a
 [<c10953a0>] ? idr_callback+0x2a/0x4b
 [<c10ed1c5>] ? idr_for_each+0x5a/0x91
 [<c1095376>] ? idr_callback+0x0/0x4b
 [<c1095367>] ? inotify_free_group_priv+0x12/0x21
 [<c1093c81>] ? fsnotify_final_destroy_group+0x16/0x1e
 [<c10954dc>] ? inotify_release+0x16/0x22
 [<c1072f76>] ? __fput+0xc0/0x163
 [<c1070a90>] ? filp_close+0x4e/0x54
 [<c1070afc>] ? sys_close+0x66/0x9c
 [<c10028b5>] ? syscall_call+0x7/0xb
---[ end trace a2df6cbeb716721c ]---
entry->group=(null) inode=(null) wd=1024


There are no processes other than dovecot's "imap" that are ever causing
these warnings. Does this indicate a problem in the kernel or rather in
dovecot?

The system appears to run fine except for the warnings, no actual crashes,
asserts, core dumps or similar in any of dovecot's components.

Mandatory 'dovecot -n' output:

[root at airframe]:~# dovecot -n
# 1.2.9: /usr/local/etc/dovecot.conf
# OS: Linux 2.6.32.2 i686 Slackware 13.0.0.0.0 
login_dir: /usr/local/var/run/dovecot/login
login_executable: /usr/local/libexec/dovecot/imap-login
mail_max_userip_connections: 20
verbose_proctitle: yes
mail_location: maildir:~/Maildir:INBOX=~/Maildir/.INBOX
fsync_disable: yes
mail_process_size: 2048
mail_plugins: expire fts fts_squat
auth default:
  mechanisms: plain digest-md5 cram-md5
  passdb:
    driver: passwd-file
    args: /usr/local/etc/dovecot-passwd
  userdb:
    driver: passwd
  socket:
    type: listen
    master:
      path: /usr/local/var/run/dovecot/auth-master
      mode: 384
plugin:
  expire: Trash 7 Junk 1
  expire_dict: proxy::expire
  fts: squat
  fts_squat: partial=4 full=6
dict:
  expire: mysql:/usr/local/etc/dovecot-dict-sql-expire.conf
[root at airframe]:~# 


Thanks & A Happy 2010,
Thomas