[Qemu-devel] Problems with USB Mass Storage emulation

[Dmitri Vorobiev]

Hello,

We tried to use an emulated USB Mass Storage device with my QEMU-emulated
system (Debian GNU/Linux, MIPS architecture, but the same problem is
present also for a similar x86 version). fdisk(1) works fine. However,
when formatting is going on or a big file is being copied into the
USB-MS partition, some errors occur and the system starts working
extremely slowly.

There's an example of such a session below.

Can someone please help us out with the emulated USB pendrive?

Thanks,
Dmitri

[Creating an image of one gigabyte:]

address@hidden:~/Projects/uniweb$ qemu-img create flash.raw 1G
Formatting 'flash.raw', fmt=raw, size=1048576 kB

[Connecting it as a USB Mass Storage device:]

(qemu) usb_add disk:format=raw:flash.raw

[Partitioning the device and trying to format it:]

uniweb:~# fdisk /dev/sda
Device contains neither a valid DOS partition table, nor Sun, SGI or
OSF disklabel
Building a new DOS disklabel with disk identifier 0x2be81509.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): p

Disk /dev/sda: 1073 MB, 1073741824 bytes
34 heads, 61 sectors/track, 1011 cylinders
Units = cylinders of 2074 * 512 = 1061888 bytes
Disk identifier: 0x2be81509

  Device Boot      Start         End      Blocks   Id  System

Command (m for help): n
Command action
  e   extended
  p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1011, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-1011, default 1011):
Using default value 1011

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
uniweb:~# mke2fs /dev/sda
sda   sda1
uniweb:~# mke2fs /dev/sda1
mke2fs 1.41.3 (12-Oct-2008)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
65536 inodes, 262094 blocks
13104 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=268435456
8 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
       32768, 98304, 163840, 229376

Writing inode tables: done
Writing superblocks and filesystem accounting information:

[After that, in `dmesg':]

usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
sd 0:0:0:0: [sda] Unhandled error code
sd 0:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 0:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 00 00 02 55 00 00 80 00
end_request: I/O error, dev sda, sector 597
Buffer I/O error on device sda1, logical block 536
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 537
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 538
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 539
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 540
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 541
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 542
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 543
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 544
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 545
lost page write due to I/O error on sda1
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
sd 0:0:0:0: [sda] Unhandled error code
sd 0:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 0:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 00 00 02 d5 00 00 80 00
end_request: I/O error, dev sda, sector 725
__ratelimit: 118 callbacks suppressed
Buffer I/O error on device sda1, logical block 664
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 665
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 666
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 667
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 668
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 669
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 670
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 671
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 672
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 673
lost page write due to I/O error on sda1
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
sd 0:0:0:0: [sda] Unhandled error code
sd 0:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 0:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 00 00 01 c5 00 00 80 00
end_request: I/O error, dev sda, sector 453
__ratelimit: 118 callbacks suppressed
Buffer I/O error on device sda1, logical block 392
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 393
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 394
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 395
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 396
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 397
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 398
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 399
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 400
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 401
lost page write due to I/O error on sda1
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
sd 0:0:0:0: [sda] Unhandled error code
sd 0:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 0:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 00 00 02 45 00 00 18 00
end_request: I/O error, dev sda, sector 581
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
sd 0:0:0:0: [sda] Unhandled error code
sd 0:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 0:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 00 00 04 55 00 00 80 00
end_request: I/O error, dev sda, sector 1109
__ratelimit: 142 callbacks suppressed
Buffer I/O error on device sda1, logical block 1048
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1049
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1050
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1051
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1052
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1053
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1054
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1055
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1056
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1057
lost page write due to I/O error on sda1
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
sd 0:0:0:0: [sda] Unhandled error code
sd 0:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 0:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 00 10 04 c5 00 00 80 00
end_request: I/O error, dev sda, sector 1049797
__ratelimit: 118 callbacks suppressed
Buffer I/O error on device sda1, logical block 1049736
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1049737
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1049738
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1049739
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1049740
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1049741
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1049742
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1049743
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1049744
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 1049745
lost page write due to I/O error on sda1
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2
usb 1-2: reset full speed USB device using uhci_hcd and address 2

[Etc. until the formatting is complete (too slowly).]