------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.31/fs/buffer.c:1152 mark_buffer_dirty+0x70/0x90()
Hardware name: 2527B4U
Modules linked in: nls_utf8 hfsplus nls_iso8859_1 nls_cp437 vfat fat usb_storage arc4 ecb lib80211_crypt_wep binfmt_misc ppdev fbcon tileblit font bitblit softcursor snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device pcmcia i915 yenta_socket snd rsrc_nonstatic sdhci_pci drm soundcore sdhci i2c_algo_bit intel_agp pcmcia_core thinkpad_acpi snd_page_alloc psmouse serio_raw video led_class ipw2200 agpgart nvram libipw lib80211 irda crc_ccitt output lp parport iptable_filter ip_tables x_tables tg3 raid10 raid456 raid6_pq async_xor async_memcpy async_tx raid1 raid0 multipath linear dm_raid45 xor
Pid: 261, comm: khubd Not tainted 2.6.31-10-generic #34-Ubuntu
Call Trace:
 [<c014082d>] warn_slowpath_common+0x6d/0xa0
 [<c0204900>] ? mark_buffer_dirty+0x70/0x90
 [<c0204900>] ? mark_buffer_dirty+0x70/0x90
 [<c0140875>] warn_slowpath_null+0x15/0x20
 [<c0204900>] mark_buffer_dirty+0x70/0x90
 [<c02543b3>] ext2_sync_fs+0x33/0x90
 [<c02027f9>] __sync_filesystem+0x39/0x60
 [<c02029c1>] sync_filesystem+0x31/0x50
 [<c020a77f>] fsync_bdev+0x1f/0x50
 [<c0303caf>] invalidate_partition+0x1f/0x40
 [<c022e79d>] del_gendisk+0x2d/0x110
 [<c03bce50>] sd_remove+0x40/0x80
 [<c039db1e>] __device_release_driver+0x3e/0x90
 [<c039dc30>] device_release_driver+0x20/0x40
 [<c039cf73>] bus_remove_device+0x73/0x90
 [<c039b6df>] device_del+0xef/0x150
 [<c03b8e97>] __scsi_remove_device+0x47/0x80
 [<c03b5b6f>] scsi_forget_host+0x5f/0x70
 [<c03ae998>] scsi_remove_host+0x58/0xe0
 [<f8515ddb>] quiesce_and_remove_host+0x5b/0xa0 [usb_storage]
 [<f8515ece>] usb_stor_disconnect+0xe/0x20 [usb_storage]
 [<c040fa91>] usb_unbind_interface+0x41/0x120
 [<c039db1e>] __device_release_driver+0x3e/0x90
 [<c039dc30>] device_release_driver+0x20/0x40
 [<c039cf73>] bus_remove_device+0x73/0x90
 [<c039b6df>] device_del+0xef/0x150
 [<c040c99d>] usb_disable_device+0x7d/0xf0
 [<c04075ee>] usb_disconnect+0x9e/0x110
 [<c040799c>] hub_port_connect_change+0x7c/0x830
 [<c040d670>] ? usb_control_msg+0xd0/0x120
 [<c0400100>] ? register_cdrom+0x2c0/0x2d0
 [<c0409205>] hub_events+0x1f5/0x500
 [<c05691bc>] ? schedule+0x40c/0x730
 [<c0157a9a>] ? finish_wait+0x4a/0x70
 [<c0409510>] ? hub_thread+0x0/0x150
 [<c0409545>] hub_thread+0x35/0x150
 [<c0157940>] ? autoremove_wake_function+0x0/0x40
 [<c015764c>] kthread+0x7c/0x90
 [<c01575d0>] ? kthread+0x0/0x90
 [<c0103f17>] kernel_thread_helper+0x7/0x10
---[ end trace 84bf53caa4132458 ]---