BUG: at fs/inotify.c:182 set_dentry_child_flags() - second

BUG: at fs/inotify.c:182 set_dentry_child_flags() - second

[Cesar Suga]

Hi,

I second Patrick McLean's e-mail from 2007/02/27.

Patrick also said he was using nfsd at that point.

WARNING: at fs/inotify.c:182 set_dentry_child_flags()
Pid: 19103, comm: gam_server Tainted: P        2.6.24.3-smp #1
 [<c01a2087>] set_dentry_child_flags+0x127/0x160
 [<c01a2110>] remove_watch_no_event+0x50/0x60
 [<c01a2228>] inotify_remove_watch_locked+0x18/0x50
 [<c01a258c>] inotify_rm_wd+0x6c/0xb0
 [<c01a2ba8>] sys_inotify_rm_watch+0x38/0x60
 [<c0104336>] syscall_call+0x7/0xb
 =======================

Running Slackware 2.6.24.3-smp stock kernel. However, ntpdate ran 1 
minute before this occurred (offset 7.4 seconds). Machine was running 
rsync to a remote NFS server (common rsync, not using rsync protocol) 
mounted at the local machine.

Regards,
Cesar

--- quote ---
I have this message in the dmesg on a mail server running on an xfs
filesystem. It appears to have happened at some point when nfsd was
restarted, but I can't seem to convince it to reproduce.

The machine is running Gentoo's 2.6.20 kernel.

BUG: at fs/inotify.c:182 set_dentry_child_flags()

Call Trace:
[<ffffffff802b7e2a>] set_dentry_child_flags+0xd4/0x132
[<ffffffff802b7eef>] remove_watch_no_event+0x67/0x76
[<ffffffff802b7f16>] inotify_remove_watch_locked+0x18/0x3b
[<ffffffff802b8004>] inotify_rm_wd+0x7e/0xa1
[<ffffffff802b8519>] sys_inotify_rm_watch+0x46/0x62
[<ffffffff80253e6e>] system_call+0x7e/0x83

Re: BUG: at fs/inotify.c:182 set_dentry_child_flags() - second

[Jan Kara]

  Hello,

> I second Patrick McLean's e-mail from 2007/02/27.
> 
> Patrick also said he was using nfsd at that point.
> 
> WARNING: at fs/inotify.c:182 set_dentry_child_flags()
> Pid: 19103, comm: gam_server Tainted: P        2.6.24.3-smp #1
> [<c01a2087>] set_dentry_child_flags+0x127/0x160
> [<c01a2110>] remove_watch_no_event+0x50/0x60
> [<c01a2228>] inotify_remove_watch_locked+0x18/0x50
> [<c01a258c>] inotify_rm_wd+0x6c/0xb0
> [<c01a2ba8>] sys_inotify_rm_watch+0x38/0x60
> [<c0104336>] syscall_call+0x7/0xb
> =======================
> 
> Running Slackware 2.6.24.3-smp stock kernel. However, ntpdate ran 1 
> minute before this occurred (offset 7.4 seconds). Machine was running 
> rsync to a remote NFS server (common rsync, not using rsync protocol) 
> mounted at the local machine.
  Here, the check itself has been racy (and producing bogus warnings) and
is already removed in current Linus's tree. Thanks for report.

									Honza
-- 
Jan Kara <jack@suse.cz>
SuSE CR Labs