possible recursive locking detected

[Christian Kujau <lists@xxxxxxxxxxxxxxx>]

Hi,

when I enabled a few more debug-options in the kernel (vanilla 
2.6.21-rc5), I came across:
[ INFO: possible recursive locking detected ]
2.6.21-rc5 #2
---------------------------------------------
rm/32198 is trying to acquire lock:
xfs_ilock+0x71/0xa0

but task is already holding lock:
xfs_ilock+0x71/0xa0

other info that might help us debug this:
3 locks held by rm/32198:
do_unlinkat+0x96/0x160
vfs_unlink+0x75/0xe0
xfs_ilock+0x71/0xa0

stack backtrace:
__lock_acquire+0xa99/0x1010
lock_acquire+0x57/0x70
xfs_ilock+0x71/0xa0
down_write+0x38/0x50
xfs_ilock+0x71/0xa0
xfs_ilock+0x71/0xa0
xfs_lock_dir_and_entry+0xf6/0x100
xfs_remove+0x197/0x4e0
d_instantiate+0x19/0x40
d_rehash+0x20/0x50
vfs_unlink+0x75/0xe0
xfs_vn_unlink+0x23/0x60
__mutex_lock_slowpath+0x13f/0x280
mark_held_locks+0x6b/0x90
__mutex_lock_slowpath+0x13f/0x280
__mutex_lock_slowpath+0x13f/0x280
trace_hardirqs_on+0xb9/0x160
vfs_unlink+0x75/0xe0
__mutex_lock_slowpath+0x132/0x280
vfs_unlink+0x75/0xe0
permission+0x91/0xf0
vfs_unlink+0x89/0xe0
do_unlinkat+0xd2/0x160
sysenter_past_esp+0x8d/0x99
trace_hardirqs_on+0xb9/0x160
sysenter_past_esp+0x5d/0x99
 =======================


Is this something I have to worry about?
Please see http://nerdbynature.de/bits/2.6.21-rc5/ for a few more 
details.
Thanks,
Christian.
--
BOFH excuse #372:

Forced to support NT servers; sysadmins quit.