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Subjectproblem mounting vfat USB flash disk (usb mass storage) under 2.6.8.1
Since upgrading from (vanilla) 2.6.7 to 2.6.8.1 I have
problem mounting my USB flashdisk:

# mount -t vfat /dev/sdb1 /mnt/usb
mount: /dev/sdb1: can't read superblock

I wrote a small program that attempts to do the same
via mount(2) system call:

int ok=mount("/dev/sdb1","/mnt/usb","vfat",0,NULL);

which returns -1, errno is set to 5 (Input/output
error).
The same disk can be mounted as loopback filesystem
with:

mount -t vfat -o loop /dev/sdb1 /mnt/usb

or can be also mounted if formated using ext2
filesystem.

Therefore I believe that it is not problem of HW. I've
found some posts indicating that a simillar problem
has been recently reported here:
http://bugzilla.kernel.org/show_bug.cgi?id=2092

I have usb_uhci, usb-storage compiled as modules.
Here is the output of lsusb -v, /proc/bus/usb/devices
and /var/log/debug (dmesg):

# lsusb -v
Bus 002 Device 001: ID 0000:0000 Virtual Hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0000 Virtual
idProduct 0x0000 Hub
bcdDevice 2.06
iManufacturer 3 Linux 2.6.8.1 uhci_hcd
iProduct 2 VIA Technologies, Inc.
VT82xxxxx UHCI USB 1.1 Controller (#2)
iSerial 1 0000:00:07.3
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type none
wMaxPacketSize 2
bInterval 255
Language IDs: (length=4)
0409 English(US)

Bus 001 Device 003: ID 0ea0:6828 Seitec USB BAR 128MB
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 Interface
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0ea0 Seitec
idProduct 0x6828 USB BAR 128MB
bcdDevice 1.10
iManufacturer 1 USB
iProduct 2 Flash Disk
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 39
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
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
wMaxPacketSize 64
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type none
wMaxPacketSize 64
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type none
wMaxPacketSize 2
bInterval 255
Language IDs: (length=4)
0409 English(US)

Bus 001 Device 001: ID 0000:0000 Virtual Hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0000 Virtual
idProduct 0x0000 Hub
bcdDevice 2.06
iManufacturer 3 Linux 2.6.8.1 uhci_hcd
iProduct 2 VIA Technologies, Inc.
VT82xxxxx UHCI USB 1.1 Controller
iSerial 1 0000:00:07.2
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type none
wMaxPacketSize 2
bInterval 255
Language IDs: (length=4)
0409 English(US)

# cat /proc/bus/usb/devices


T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1
Spd=12 MxCh= 2
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8
#Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 2.06
S: Manufacturer=Linux 2.6.8.1 uhci_hcd
S: Product=VIA Technologies, Inc. VT82xxxxx UHCI USB
1.1 Controller (#2)
S: SerialNumber=0000:00:07.3
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00
Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms

T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1
Spd=12 MxCh= 2
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8
#Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 2.06
S: Manufacturer=Linux 2.6.8.1 uhci_hcd
S: Product=VIA Technologies, Inc. VT82xxxxx UHCI USB
1.1 Controller
S: SerialNumber=0000:00:07.2
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00
Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms

T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 3
Spd=12 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64
#Cfgs= 1
P: Vendor=0ea0 ProdID=6828 Rev= 1.10
S: Manufacturer=USB
S: Product=Flash Disk
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 3 Cls=08(stor.) Sub=06 Prot=50
Driver=usb-storage
E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms
E: Ad=83(I) Atr=03(Int.) MxPS= 2 Ivl=255ms

# cat /var/log/debug
Aug 17 21:30:01 ras kernel: usb-storage: queuecommand
called
Aug 17 21:30:01 ras kernel: usb-storage: *** thread
awakened.
Aug 17 21:30:01 ras kernel: usb-storage: Command
TEST_UNIT_READY (6 bytes)
Aug 17 21:30:01 ras kernel: usb-storage: 00 00 00 00
00 00
Aug 17 21:30:01 ras kernel: usb-storage: Bulk Command
S 0x43425355 T 0x2ed L 0 F 0 Trg 0 LUN 0 CL 6
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_buf: xfer 31 bytes
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 31/31
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk command
transfer result=0
Aug 17 21:30:01 ras kernel: usb-storage: Attempting to
get CSW...
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_buf: xfer 13 bytes
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 13/13
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk status
result = 0
Aug 17 21:30:01 ras kernel: usb-storage: Bulk Status S
0x53425355 T 0x2ed R 0 Stat 0x0
Aug 17 21:30:01 ras kernel: usb-storage: scsi cmd
done, result=0x0
Aug 17 21:30:01 ras kernel: usb-storage: *** thread
sleeping.
Aug 17 21:30:01 ras kernel: usb-storage: queuecommand
called
Aug 17 21:30:01 ras kernel: usb-storage: *** thread
awakened.
Aug 17 21:30:01 ras kernel: usb-storage: Command
READ_10 (10 bytes)
Aug 17 21:30:01 ras kernel: usb-storage: 28 00 00 00
00 20 00 00 01 00
Aug 17 21:30:01 ras kernel: usb-storage: Bulk Command
S 0x43425355 T 0x2ee L 512 F 128 Trg 0 LUN 0 CL 10
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_buf: xfer 31 bytes
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 31/31
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk command
transfer result=0
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_sglist: xfer 512 bytes, 1
entries
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 512/512
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk data
transfer result 0x0
Aug 17 21:30:01 ras kernel: usb-storage: Attempting to
get CSW...
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_buf: xfer 13 bytes
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 13/13
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk status
result = 0
Aug 17 21:30:01 ras kernel: usb-storage: Bulk Status S
0x53425355 T 0x2ee R 512 Stat 0x0
Aug 17 21:30:01 ras kernel: usb-storage: --
unexpectedly short transfer
Aug 17 21:30:01 ras kernel: usb-storage: scsi cmd
done, result=0x10070000
Aug 17 21:30:01 ras kernel: usb-storage: *** thread
sleeping.
Aug 17 21:30:01 ras kernel: usb-storage: queuecommand
called
Aug 17 21:30:01 ras kernel: usb-storage: *** thread
awakened.
Aug 17 21:30:01 ras kernel: usb-storage: Command
READ_10 (10 bytes)
Aug 17 21:30:01 ras kernel: usb-storage: 28 00 00 00
00 20 00 00 01 00
Aug 17 21:30:01 ras kernel: usb-storage: Bulk Command
S 0x43425355 T 0x2ef L 512 F 128 Trg 0 LUN 0 CL 10
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_buf: xfer 31 bytes
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 31/31
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk command
transfer result=0
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_sglist: xfer 512 bytes, 1
entries
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 512/512
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk data
transfer result 0x0
Aug 17 21:30:01 ras kernel: usb-storage: Attempting to
get CSW...
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_buf: xfer 13 bytes
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 13/13
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk status
result = 0
Aug 17 21:30:01 ras kernel: usb-storage: Bulk Status S
0x53425355 T 0x2ef R 512 Stat 0x0
Aug 17 21:30:01 ras kernel: usb-storage: --
unexpectedly short transfer
Aug 17 21:30:01 ras kernel: usb-storage: scsi cmd
done, result=0x10070000
Aug 17 21:30:01 ras kernel: usb-storage: *** thread
sleeping.
Aug 17 21:30:01 ras kernel: usb-storage: queuecommand
called
Aug 17 21:30:01 ras kernel: usb-storage: *** thread
awakened.
Aug 17 21:30:01 ras kernel: usb-storage: Command
READ_10 (10 bytes)
Aug 17 21:30:01 ras kernel: usb-storage: 28 00 00 00
00 20 00 00 01 00
Aug 17 21:30:01 ras kernel: usb-storage: Bulk Command
S 0x43425355 T 0x2f0 L 512 F 128 Trg 0 LUN 0 CL 10
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_buf: xfer 31 bytes
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 31/31
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk command
transfer result=0
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_sglist: xfer 512 bytes, 1
entries
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 512/512
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk data
transfer result 0x0
Aug 17 21:30:01 ras kernel: usb-storage: Attempting to
get CSW...
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_buf: xfer 13 bytes
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 13/13
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk status
result = 0
Aug 17 21:30:01 ras kernel: usb-storage: Bulk Status S
0x53425355 T 0x2f0 R 512 Stat 0x0
Aug 17 21:30:01 ras kernel: usb-storage: --
unexpectedly short transfer
Aug 17 21:30:01 ras kernel: usb-storage: scsi cmd
done, result=0x10070000
Aug 17 21:30:01 ras kernel: usb-storage: *** thread
sleeping.
Aug 17 21:30:01 ras kernel: usb-storage: queuecommand
called
Aug 17 21:30:01 ras kernel: usb-storage: *** thread
awakened.
Aug 17 21:30:01 ras kernel: usb-storage: Command
READ_10 (10 bytes)
Aug 17 21:30:01 ras kernel: usb-storage: 28 00 00 00
00 20 00 00 01 00
Aug 17 21:30:01 ras kernel: usb-storage: Bulk Command
S 0x43425355 T 0x2f1 L 512 F 128 Trg 0 LUN 0 CL 10
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_buf: xfer 31 bytes
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 31/31
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk command
transfer result=0
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_sglist: xfer 512 bytes, 1
entries
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 512/512
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk data
transfer result 0x0
Aug 17 21:30:01 ras kernel: usb-storage: Attempting to
get CSW...
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_buf: xfer 13 bytes
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 13/13
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk status
result = 0
Aug 17 21:30:01 ras kernel: usb-storage: Bulk Status S
0x53425355 T 0x2f1 R 512 Stat 0x0
Aug 17 21:30:01 ras kernel: usb-storage: --
unexpectedly short transfer
Aug 17 21:30:01 ras kernel: usb-storage: scsi cmd
done, result=0x10070000
Aug 17 21:30:01 ras kernel: usb-storage: *** thread
sleeping.
Aug 17 21:30:01 ras kernel: usb-storage: queuecommand
called
Aug 17 21:30:01 ras kernel: usb-storage: *** thread
awakened.
Aug 17 21:30:01 ras kernel: usb-storage: Command
READ_10 (10 bytes)
Aug 17 21:30:01 ras kernel: usb-storage: 28 00 00 00
00 20 00 00 01 00
Aug 17 21:30:01 ras kernel: usb-storage: Bulk Command
S 0x43425355 T 0x2f2 L 512 F 128 Trg 0 LUN 0 CL 10
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_buf: xfer 31 bytes
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 31/31
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk command
transfer result=0
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_sglist: xfer 512 bytes, 1
entries
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 512/512
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk data
transfer result 0x0
Aug 17 21:30:01 ras kernel: usb-storage: Attempting to
get CSW...
Aug 17 21:30:01 ras kernel: usb-storage:
usb_stor_bulk_transfer_buf: xfer 13 bytes
Aug 17 21:30:01 ras kernel: usb-storage: Status code
0; transferred 13/13
Aug 17 21:30:01 ras kernel: usb-storage: -- transfer
complete
Aug 17 21:30:01 ras kernel: usb-storage: Bulk status
result = 0
Aug 17 21:30:01 ras kernel: usb-storage: Bulk Status S
0x53425355 T 0x2f2 R 512 Stat 0x0
Aug 17 21:30:01 ras kernel: usb-storage: --
unexpectedly short transfer
Aug 17 21:30:01 ras kernel: usb-storage: scsi cmd
done, result=0x10070000
Aug 17 21:30:01 ras kernel: usb-storage: *** thread
sleeping.
--
bye
rastos



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