Major problems with USB Mass-Storage

I also saw this just now. The device mounted, then when I tried to ls and then umount:

sr0: CDROM (ioctl) error, command: 0x5a 00 2c 00 00 00 00 00 10 00
sr: sense = 0 0
Non-extended sense class 0 code 0x0
Raw sense data:0x00 0x00 0x00 0x00
ISO 9660 Extensions: RRIP_1991A
SCSI error : <0 0 0 0> return code = 0x70000
end_request: I/O error, dev sr0, sector 96

usb 1-2: USB disconnect, address 2
usb 1-2: usb_disable_device nuking all URBs
usb 1-2: unregistering interface 1-2:2.0
usb 1-2: unregistering device

scsi0 (0:0): rejecting I/O to dead device scsi0 (0:0): rejecting I/O to dead device scsi0 (0:0): rejecting I/O to dead device scsi0 (0:0): rejecting I/O to dead device scsi0 (0:0): rejecting I/O to dead device scsi0 (0:0): rejecting I/O to dead device scsi0 (0:0): rejecting I/O to dead device scsi0 (0:0): rejecting I/O to dead device scsi0 (0:0): rejecting I/O to dead device
SCSI error: host 0 id 0 lun 0 return code = 4000000
Sense class 0, sense error 0, extended sense 0

Unable to handle kernel paging request at virtual address 6e697463
  printing eip:
c01f509f
*pde = 00000000
Oops: 0000 [#1]
PREEMPT
Modules linked in: snd_pcm_oss snd_mixer_oss snd_emu10k1 snd_rawmidi 
snd_pcm snd_timer snd_seq_device snd_ac97_codec snd_page_alloc 
snd_util_mem snd_hwdep snd nvidia
CPU:    0
EIP:    0060:[<c01f509f>]    Tainted: P
EFLAGS: 00210047   (2.6.8.1)

EIP is at as_insert_request+0x8f/0x180
eax: 6e697463 ebx: d7c122c0 ecx: 00000001 edx: 00000000
esi: d7c89cb0 edi: 00000000 ebp: 00000000 esp: c9a94d5c
ds: 007b es: 007b ss: 0068
Process umount (pid: 1399, threadinfo=c9a94000 task=cb82a170)

Stack: 00200082 c9a94d88 00200082 c0316818 d7c4102c d7c89cb0 00000001 
00200202
        c01ec955 d7c4102c d7c89cb0 00000001 d7c89cb0 00000001 d7c4102c 
c01ef147
        d7c4102c d7c89cb0 00000001 00000000 c9a94df4 d7c89c00 c0327fa0 
c9a94eb4
Call Trace:
  [<c01ec955>] __elv_add_request+0x45/0xb0
  [<c01ef147>] blk_insert_request+0x77/0xe0
  [<c0222398>] scsi_insert_special_req+0x38/0x40
  [<c0222608>] scsi_wait_req+0x68/0xa0
  [<c0222510>] scsi_wait_done+0x0/0x90
  [<c022a152>] sr_do_ioctl+0x92/0x2a0
  [<c0229e45>] sr_packet+0x25/0x40
  [<c022fa85>] cdrom_get_disc_info+0x65/0xc0
  [<c022b98b>] cdrom_mrw_exit+0x1b/0x70
  [<c022b574>] unregister_cdrom+0x94/0xe0
  [<c0229ea2>] sr_kref_release+0x42/0x70
  [<c01ca9a8>] kref_put+0x18/0x20
  [<c02293c9>] sr_block_release+0x69/0x80
  [<c015326a>] blkdev_put+0x17a/0x1a0
  [<c0150d3b>] deactivate_super+0x5b/0x90
  [<c016755f>] sys_umount+0x3f/0xa0
  [<c013f066>] do_munmap+0x146/0x190
  [<c01675d5>] sys_oldumount+0x15/0x20
  [<c010405b>] syscall_call+0x7/0xb
Code: 8b 10 89 72 04 89 16 89 46 04 89 30 90 8d 74 26 00 89 74 24
  <6>note: umount[1399] exited with preempt_count 2
bad: scheduling while atomic!
  [<c02cbd95>] schedule+0x4c5/0x4d0
  [<c013afa3>] unmap_page_range+0x53/0x80
  [<c013b186>] unmap_vmas+0x1b6/0x1d0

  [<c013f3ed>] exit_mmap+0x7d/0x160
  [<c0112dd5>] mmput+0x65/0x90
  [<c0116ff2>] do_exit+0x152/0x410
  [<c010fc30>] do_page_fault+0x0/0x56d
  [<c0104929>] die+0xf9/0x100
  [<c010fe0e>] do_page_fault+0x1de/0x56d
  [<c014bba3>] wake_up_buffer+0x13/0x40
  [<c019021d>] do_get_write_access+0x26d/0x610