Found this in my syslog:

> Jul  7 00:05:53 gx110 kernel: [  131.691049]
> Jul  7 00:05:53 gx110 kernel: [  131.691055] =============================================
> Jul  7 00:05:53 gx110 kernel: [  131.691074] [ INFO: possible recursive locking detected ]
> Jul  7 00:05:53 gx110 kernel: [  131.691083] ---------------------------------------------
> Jul  7 00:05:53 gx110 kernel: [  131.691092] udevd/3729 is trying to acquire lock:
> Jul  7 00:05:53 gx110 kernel: [  131.691101]  (&inode->i_mutex){--..}, at: [<c033c72a>] mutex_lock+0x1c/0x1f
> Jul  7 00:05:53 gx110 kernel: [  131.691148]
> Jul  7 00:05:53 gx110 kernel: [  131.691150] but task is already holding lock:
> Jul  7 00:05:53 gx110 kernel: [  131.691158]  (&inode->i_mutex){--..}, at: [<c033c72a>] mutex_lock+0x1c/0x1f
> Jul  7 00:05:53 gx110 kernel: [  131.691177]
> Jul  7 00:05:53 gx110 kernel: [  131.691179] other info that might help us debug this:
> Jul  7 00:05:53 gx110 kernel: [  131.691189] 1 lock held by udevd/3729:
> Jul  7 00:05:53 gx110 kernel: [  131.691195]  #0:  (&inode->i_mutex){--..}, at: [<c033c72a>] mutex_lock+0x1c/0x1f
> Jul  7 00:05:54 gx110 kernel: [  131.691215]
> Jul  7 00:05:54 gx110 kernel: [  131.691217] stack backtrace:
> Jul  7 00:05:54 gx110 kernel: [  131.691940]  [<c0103f4d>] show_trace_log_lvl+0x54/0xfd
> Jul  7 00:05:54 gx110 kernel: [  131.691997]  [<c010504d>] show_trace+0xd/0x10
> Jul  7 00:05:54 gx110 kernel: [  131.692044]  [<c0105067>] dump_stack+0x17/0x1c
> Jul  7 00:05:54 gx110 kernel: [  131.692090]  [<c012e3fa>] __lock_acquire+0x758/0x9bf
> Jul  7 00:05:54 gx110 kernel: [  131.692336]  [<c012e93e>] lock_acquire+0x5e/0x80
> Jul  7 00:05:54 gx110 kernel: [  131.692572]  [<c033c5a7>] __mutex_lock_slowpath+0xa7/0x20e
> Jul  7 00:05:54 gx110 kernel: [  131.692796]  [<c033c72a>] mutex_lock+0x1c/0x1f
> Jul  7 00:05:54 gx110 kernel: [  131.693017]  [<c01ba730>] xattr_readdir+0x50/0x456
> Jul  7 00:05:54 gx110 kernel: [  131.694269]  [<c01bb304>] reiserfs_chown_xattrs+0xdd/0x112
> Jul  7 00:05:54 gx110 kernel: [  131.694875]  [<c019dca6>] reiserfs_setattr+0x113/0x250
> Jul  7 00:05:54 gx110 kernel: [  131.695516]  [<c0174619>] notify_change+0x135/0x2c0
> Jul  7 00:05:54 gx110 kernel: [  131.695991]  [<c015b328>] chown_common+0x93/0xab
> Jul  7 00:05:54 gx110 kernel: [  131.696388]  [<c015b373>] sys_chown+0x33/0x45
> Jul  7 00:05:54 gx110 kernel: [  131.696770]  [<c0102cbd>] sysenter_past_esp+0x56/0x8d
> Jul  7 00:05:54 gx110 kernel: [  132.094621] IA-32 Microcode Update Driver: v1.14a <tigran@veritas.com>

This is originally a SuSE 10.0 installation with a ReiserFS root
filesystem, now running a 2.6.18-rc1 kernel built on the same system
with CONFIG_REISERFS_FS=y and CONFIG_PROVE_LOCKING=y.

ts@gx110:~> uname -a
Linux gx110 2.6.18-rc1-noinitrd #1 PREEMPT Thu Jul 6 18:17:31 CEST 2006
i686 i686 i386 GNU/Linux

Regards
Tilman

-- 
Tilman Schmidt                                    E-Mail: tilman@imap.cc
Bonn, Germany
It is well known that a vital ingredient of success is not knowing that
what you're attempting can't be done. [Terry Pratchett, Equal Rites]