linux-2.6.17-mm6: strange kobject message

[Paul Drynoff]

Here is dmesg which I got during boot,
the first part not interesting I already reported about it,
and I don't remember one of two things: Arjan van de Ven's patch was
lost or not good enough. The second part is related to kobject,
I'm not sure is it normal when kobject tell about -EEXIST and print stack?
Note that this is happened only once per 100 normal booting, I mean the second part.

=================================
[ INFO: inconsistent lock state ]
---------------------------------
inconsistent {hardirq-on-W} -> {in-hardirq-W} usage.
dhclient/1952 [HC1[1]:SC0[1]:HE0:SE0] takes:
 (&ei_local->page_lock){+...}, at: [<c039d78d>] ei_interrupt+0x39/0x32c
{hardirq-on-W} state was registered at:
  [<c0133f5b>] lock_acquire+0x57/0x74
  [<c05b15c2>] _spin_lock+0x1a/0x28
  [<c039d558>] ei_start_xmit+0x74/0x270
  [<c053ecc9>] dev_hard_start_xmit+0x1a9/0x1f8
  [<c05499be>] __qdisc_run+0xb6/0x1a8
  [<c05403fd>] dev_queue_xmit+0x115/0x23c
  [<c059e441>] packet_sendmsg_spkt+0x195/0x1d0
  [<c05348cb>] sock_sendmsg+0xcf/0xf0
  [<c0534c8a>] sys_sendto+0xb6/0xf0
  [<c0535e07>] sys_socketcall+0x11f/0x194
  [<c010336f>] syscall_call+0x7/0xb
irq event stamp: 8667
hardirqs last  enabled at (8666): [<c05b18b1>] _spin_unlock_irqrestore+0x3d/0x48
hardirqs last disabled at (8667): [<c0103553>] common_interrupt+0x1b/0x2c
softirqs last  enabled at (8632): [<c011f23b>] __do_softirq+0x97/0xa8
softirqs last disabled at (8660): [<c0540323>] dev_queue_xmit+0x3b/0x23c

other info that might help us debug this:
1 lock held by dhclient/1952:
 #0:  (&dev->_xmit_lock){-+..}, at: [<c054993f>] __qdisc_run+0x37/0x1a8

stack backtrace:
 [<c0103b3e>] show_trace+0x16/0x1c
 [<c010412a>] dump_stack+0x1a/0x20
 [<c0132037>] print_usage_bug+0x1d7/0x1e4
 [<c0132802>] mark_lock+0x432/0x548
 [<c0133542>] __lock_acquire+0x53e/0xc68
 [<c0133f5b>] lock_acquire+0x57/0x74
 [<c05b15c2>] _spin_lock+0x1a/0x28
 [<c039d78d>] ei_interrupt+0x39/0x32c
 [<c013b150>] handle_IRQ_event+0x24/0x58
 [<c013c4e4>] handle_level_irq+0x6c/0xd0
 [<c0104ed1>] do_IRQ+0x55/0xa8
 [<c010355d>] common_interrupt+0x25/0x2c
 [<c013b957>] enable_irq+0x4b/0x9c
 [<c039d5f3>] ei_start_xmit+0x10f/0x270
 [<c053ecc9>] dev_hard_start_xmit+0x1a9/0x1f8
 [<c05499be>] __qdisc_run+0xb6/0x1a8
 [<c05403fd>] dev_queue_xmit+0x115/0x23c
 [<c059e441>] packet_sendmsg_spkt+0x195/0x1d0
 [<c05348cb>] sock_sendmsg+0xcf/0xf0
 [<c0534c8a>] sys_sendto+0xb6/0xf0
 [<c0535e07>] sys_socketcall+0x11f/0x194
 [<c010336f>] syscall_call+0x7/0xb
kobject_add failed for vcs1 with -EEXIST, don't try to register things with the same name in the same directory.
 [<c0103b3e>] show_trace+0x16/0x1c
 [<c010412a>] dump_stack+0x1a/0x20
 [<c02c9774>] kobject_add+0x114/0x1b4
 [<c037455f>] class_device_add+0xb3/0x484
 [<c0374943>] class_device_register+0x13/0x18
 [<c03749d2>] class_device_create+0x8a/0xbc
 [<c032d016>] vcs_make_devfs+0x26/0x54
 [<c0332bd9>] con_open+0x61/0x88
 [<c0327e7f>] tty_open+0x16f/0x348
 [<c0164507>] chrdev_open+0x63/0x168
 [<c015a634>] __dentry_open+0x8c/0x164
 [<c015a790>] nameidata_to_filp+0x30/0x3c
 [<c015a7d7>] do_filp_open+0x3b/0x44
 [<c015a81b>] do_sys_open+0x3b/0xc4
 [<c015a8cf>] sys_open+0x13/0x18
 [<c010336f>] syscall_call+0x7/0xb
kobject_add failed for vcsa1 with -EEXIST, don't try to register things with the same name in the same directory.
 [<c0103b3e>] show_trace+0x16/0x1c
 [<c010412a>] dump_stack+0x1a/0x20
 [<c02c9774>] kobject_add+0x114/0x1b4
 [<c037455f>] class_device_add+0xb3/0x484
 [<c0374943>] class_device_register+0x13/0x18
 [<c03749d2>] class_device_create+0x8a/0xbc
 [<c032d03c>] vcs_make_devfs+0x4c/0x54
 [<c0332bd9>] con_open+0x61/0x88
 [<c0327e7f>] tty_open+0x16f/0x348
 [<c0164507>] chrdev_open+0x63/0x168
 [<c015a634>] __dentry_open+0x8c/0x164
 [<c015a790>] nameidata_to_filp+0x30/0x3c
 [<c015a7d7>] do_filp_open+0x3b/0x44
 [<c015a81b>] do_sys_open+0x3b/0xc4
 [<c015a8cf>] sys_open+0x13/0x18
 [<c010336f>] syscall_call+0x7/0xb
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