------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.31/fs/buffer.c:1152 mark_buffer_dirty+0x70/0x90()
Hardware name: HP Compaq nx7300 (RU457ET#ABD)
Modules linked in: nls_iso8859_1 nls_cp437 vfat fat usb_storage aes_i586 aes_generic binfmt_misc ppdev snd_hda_codec_analog snd_hda_intel pcmcia arc4 ecb snd_hda_codec yenta_socket iwl3945 joydev snd_hwdep iwlcore rsrc_nonstatic snd_pcm_oss lp parport pcmcia_core snd_mixer_oss psmouse mac80211 serio_raw led_class snd_pcm iptable_filter snd_seq_dummy ip_tables x_tables snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd soundcore snd_page_alloc cfg80211 dm_raid45 xor fbcon tileblit font bitblit softcursor ohci1394 ieee1394 b44 ssb mii i915 drm i2c_algo_bit intel_agp agpgart video output
Pid: 2326, comm: umount Not tainted 2.6.31-14-generic #48-Ubuntu
Call Trace:
 [<c014518d>] warn_slowpath_common+0x6d/0xa0
 [<c02093b0>] ? mark_buffer_dirty+0x70/0x90
 [<c02093b0>] ? mark_buffer_dirty+0x70/0x90
 [<c01451d5>] warn_slowpath_null+0x15/0x20
 [<c02093b0>] mark_buffer_dirty+0x70/0x90
 [<c02961bd>] journal_update_superblock+0x6d/0xd0
 [<c015c280>] ? autoremove_wake_function+0x0/0x40
 [<c029665b>] journal_destroy+0xeb/0x110
 [<c024b8cb>] ext3_put_super+0x2b/0x240
 [<c01fac2e>] ? invalidate_inodes+0xfe/0x120
 [<c0224ae0>] ? vfs_quota_off+0x0/0x20
 [<c01e9478>] generic_shutdown_super+0x48/0xd0
 [<c01e9525>] kill_block_super+0x25/0x40
 [<c01ea1fe>] deactivate_super+0x5e/0x90
 [<c01fd8f7>] mntput_no_expire+0x87/0xd0
 [<c01fded2>] sys_umount+0x42/0x90
 [<c010336c>] syscall_call+0x7/0xb
---[ end trace 5b43ba378ab5b43a ]---