------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.31/fs/buffer.c:1152 mark_buffer_dirty+0x70/0x90()
Hardware name: 23718EG
Modules linked in: usb_storage binfmt_misc ppdev vboxnetadp vboxnetflt vboxdrv arc4 ecb ath5k snd_intel8x0 iptable_filter pcmcia sdhci_pci thinkpad_acpi mac80211 snd_ac97_codec ip_tables psmouse irda sdhci nvram lp ac97_bus x_tables ath yenta_socket led_class serio_raw snd_pcm_oss cfg80211 rsrc_nonstatic parport snd_mixer_oss pcmcia_core snd_pcm snd_seq_dummy shpchp snd_seq_oss snd_seq_midi crc_ccitt snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd soundcore snd_page_alloc fbcon tileblit font bitblit softcursor e1000 i915 drm i2c_algo_bit intel_agp agpgart video output
Pid: 19, comm: khubd 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
 [<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
 [<fae67ddb>] quiesce_and_remove_host+0x5b/0xa0 [usb_storage]
 [<fae67ece>] 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 bb3c212058f46c91 ]---