------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.35/fs/buffer.c:1151 mark_buffer_dirty+0x70/0x90()
Hardware name: 8918CGG
Modules linked in: aes_i586 aes_generic rfcomm sco bnep binfmt_misc l2cap vboxnetadp vboxnetflt vboxdrv parport_pc ppdev arc4 nvidia(P) snd_hda_codec_analog joydev iwlagn iwlcore thinkpad_acpi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi pcmcia snd_seq_midi_event snd_seq mac80211 snd_timer uvcvideo snd_seq_device btusb tpm_tis videodev tpm v4l1_compat yenta_socket pcmcia_rsrc r852 sm_common video bluetooth cfg80211 pcmcia_core tpm_bios nand nand_ids nand_ecc snd nvram psmouse intel_agp output serio_raw mtd soundcore snd_page_alloc agpgart lp parport usbhid hid usb_storage firewire_ohci sdhci_pci ahci sdhci led_class firewire_core libahci crc_itu_t e1000e
Pid: 2114, comm: umount Tainted: P            2.6.35-22-generic #33-Ubuntu
Call Trace:
 [<c014ac52>] warn_slowpath_common+0x72/0xa0
 [<c023d280>] ? mark_buffer_dirty+0x70/0x90
 [<c023d280>] ? mark_buffer_dirty+0x70/0x90
 [<c014aca2>] warn_slowpath_null+0x22/0x30
 [<c023d280>] mark_buffer_dirty+0x70/0x90
 [<c02cf142>] journal_update_superblock+0x72/0xd0
 [<c02cd8f3>] cleanup_journal_tail+0xc3/0x120
 [<c02cdb30>] ? __process_buffer+0x190/0x1d0
 [<c02cdf73>] log_do_checkpoint+0x193/0x210
 [<c012ce18>] ? default_spin_lock_flags+0x8/0x10
 [<c05c8b9f>] ? _raw_spin_lock_irqsave+0x2f/0x50
 [<c05cd49e>] ? kprobe_flush_task+0x5e/0x80
 [<c0101add>] ? __switch_to+0xcd/0x180
 [<c013eb1b>] ? finish_task_switch+0x9b/0xc0
 [<c05c8f42>] ? __reacquire_kernel_lock+0x12/0x60
 [<c05c6dcd>] ? schedule+0x77d/0x7a0
 [<c012ce18>] ? default_spin_lock_flags+0x8/0x10
 [<c05c8b9f>] ? _raw_spin_lock_irqsave+0x2f/0x50
 [<c0165f7f>] ? finish_wait+0x4f/0x70
 [<c05c8b6d>] ? _raw_spin_lock+0xd/0x10
 [<c02cf50c>] ? journal_kill_thread+0xdc/0xf0
 [<c05c7979>] ? mutex_lock+0x19/0x40
 [<c0165e10>] ? autoremove_wake_function+0x0/0x50
 [<c02cf567>] journal_destroy+0x47/0x110
 [<c0282a2e>] ext3_put_super+0x4e/0x2b0
 [<c022d55e>] ? invalidate_inodes+0xfe/0x120
 [<c021a3ed>] generic_shutdown_super+0x4d/0xd0
 [<c020e128>] ? pcpu_free_area+0x168/0x1f0
 [<c021a49a>] kill_block_super+0x2a/0x50
 [<c021acad>] deactivate_locked_super+0x3d/0x60
 [<c021b670>] deactivate_super+0x50/0x70
 [<c023073f>] mntput_no_expire+0x8f/0xd0
 [<c0230d32>] sys_umount+0x62/0xb0
 [<c05c90a4>] syscall_call+0x7/0xb
---[ end trace b197539b20d40978 ]---