------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.31/fs/buffer.c:1152 mark_buffer_dirty+0x70/0x90()
Hardware name: HP EliteBook 2730p
Modules linked in: nls_iso8859_1 nls_cp437 vfat fat binfmt_misc bridge stp ppdev bnep vboxnetflt vboxnetadp vboxdrv dm_crypt snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy arc4 ecb snd_seq_oss snd_seq_midi snd_rawmidi iwlagn snd_seq_midi_event iwlcore snd_seq joydev hp_accel mac80211 psmouse uvcvideo videodev qcserial v4l1_compat lis3lv02d iptable_filter input_polldev heci(C) ip_tables snd_timer cfg80211 snd_seq_device usbserial sdhci_pci serio_raw btusb sdhci ricoh_mmc tpm_infineon snd x_tables soundcore snd_page_alloc tpm led_class tpm_bios lp parport dm_raid45 xor usbhid fbcon tileblit font bitblit softcursor usb_storage ohci1394 ieee1394 i915 drm i2c_algo_bit video output e1000e intel_agp agpgart
Pid: 26, comm: khubd Tainted: G         C 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
 [<c0258e73>] ext2_sync_fs+0x33/0x90
 [<c02072a9>] __sync_filesystem+0x39/0x60
 [<c0207471>] sync_filesystem+0x31/0x50
 [<c020f22f>] fsync_bdev+0x1f/0x50
 [<c03087df>] invalidate_partition+0x1f/0x40
 [<c023325d>] del_gendisk+0x2d/0x110
 [<c03c1a10>] sd_remove+0x40/0x80
 [<c03a26de>] __device_release_driver+0x3e/0x90
 [<c03a27f0>] device_release_driver+0x20/0x40
 [<c03a1b33>] bus_remove_device+0x73/0x90
 [<c03a029f>] device_del+0xef/0x150
 [<c03bda57>] __scsi_remove_device+0x47/0x80
 [<c03ba72f>] scsi_forget_host+0x5f/0x70
 [<c03b3558>] scsi_remove_host+0x58/0xe0
 [<f8763ddb>] quiesce_and_remove_host+0x5b/0xa0 [usb_storage]
 [<f8763ece>] usb_stor_disconnect+0xe/0x20 [usb_storage]
 [<c0414821>] usb_unbind_interface+0x41/0x120
 [<c03a26de>] __device_release_driver+0x3e/0x90
 [<c03a27f0>] device_release_driver+0x20/0x40
 [<c03a1b33>] bus_remove_device+0x73/0x90
 [<c03a029f>] device_del+0xef/0x150
 [<c041172d>] usb_disable_device+0x7d/0xf0
 [<c040c37e>] usb_disconnect+0x9e/0x110
 [<c040c72c>] hub_port_connect_change+0x7c/0x830
 [<c0412400>] ? usb_control_msg+0xd0/0x120
 [<c0400100>] ? ppp_mp_reconstruct+0x210/0x2c0
 [<c040df95>] hub_events+0x1f5/0x500
 [<c056e97c>] ? schedule+0x40c/0x730
 [<c015c3da>] ? finish_wait+0x4a/0x70
 [<c040e2a0>] ? hub_thread+0x0/0x150
 [<c040e2d5>] hub_thread+0x35/0x150
 [<c015c280>] ? autoremove_wake_function+0x0/0x40
 [<c015bf8c>] kthread+0x7c/0x90
 [<c015bf10>] ? kthread+0x0/0x90
 [<c0104007>] kernel_thread_helper+0x7/0x10
---[ end trace 05f56d575d951ac1 ]---