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User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050513 Fedora/1.0.4-1.3.1 Firefox/1.0.4

Description of problem:
This is the 32 bit kernel running on an Athlon 64.

I have a usb hard drive enclosure.  When I plug it in, and then unplug it, even if I never mounted any file system, I get a kernel panic on shutdown.

In drivers/block/cfq-iosched.c line 1065

Version-Release number of selected component (if applicable):
kernel-2.6.11-1.14_FC3

How reproducible:
Sometimes

Steps to Reproduce:
1. I'm not sure if this happens every time, but I'm not planning on finding out
2.
3.
  

Additional info:

Bus 001 Device 003: ID 05e3:0702 Genesys Logic, Inc. USB 2.0 IDE Adapter
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x05e3 Genesys Logic, Inc.
  idProduct          0x0702 USB 2.0 IDE Adapter
  bcdDevice            0.02
  iManufacturer           0 
  iProduct                1 USB TO IDE
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xc0
      Self Powered
    MaxPower               96mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk (Zip)
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               none
          Usage Type               Data
        wMaxPacketSize     0x0200  bytes 512 once
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               none
          Usage Type               Data
        wMaxPacketSize     0x0200  bytes 512 once
        bInterval               1
  Language IDs: (length=4)
     0409 English(US)