------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.35/fs/buffer.c:1151 mark_buffer_dirty+0x70/0x90()
Hardware name: Latitude D820                   
Modules linked in: nls_iso8859_1 nls_cp437 vfat fat usb_storage aes_i586 aes_generic snd_hda_codec_idt binfmt_misc parport_pc ppdev joydev arc4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi i915 snd_rawmidi iwl3945 iwlcore snd_seq_midi_event pcmcia snd_seq mac80211 drm_kms_helper snd_timer snd_seq_device drm dell_wmi irda cfg80211 yenta_socket i2c_algo_bit intel_agp dell_laptop snd pcmcia_rsrc pcmcia_core led_class video dcdbas psmouse crc_ccitt serio_raw soundcore snd_page_alloc output agpgart lp parport firewire_ohci tg3 firewire_core crc_itu_t
Pid: 13001, comm: umount Not tainted 2.6.35-19-generic #28-Ubuntu
Call Trace:
 [<c014a812>] warn_slowpath_common+0x72/0xa0
 [<c023cd40>] ? mark_buffer_dirty+0x70/0x90
 [<c023cd40>] ? mark_buffer_dirty+0x70/0x90
 [<c014a862>] warn_slowpath_null+0x22/0x30
 [<c023cd40>] mark_buffer_dirty+0x70/0x90
 [<c02cebd2>] journal_update_superblock+0x72/0xd0
 [<c0165920>] ? autoremove_wake_function+0x0/0x50
 [<c02cf0a3>] journal_destroy+0xf3/0x110
 [<c02824be>] ext3_put_super+0x4e/0x2b0
 [<c022d01e>] ? invalidate_inodes+0xfe/0x120
 [<c0219ead>] generic_shutdown_super+0x4d/0xd0
 [<c020dbe8>] ? pcpu_free_area+0x168/0x1f0
 [<c0219f5a>] kill_block_super+0x2a/0x50
 [<c021a76d>] deactivate_locked_super+0x3d/0x60
 [<c021b130>] deactivate_super+0x50/0x70
 [<c02301ff>] mntput_no_expire+0x8f/0xd0
 [<c02307f2>] sys_umount+0x62/0xb0
 [<c05c8364>] syscall_call+0x7/0xb
---[ end trace 66175513b3f1c75a ]---