[Qemu-devel] [Bug 906221] [NEW] USBDEVFS_CLEAR_HALT stall with USB-CDROM qemu-1.0

[Erik Rull]

Public bug reported:

When connecting a USB DVD/CDROM drive to the linux host, it works fine and I 
can mount the inserted DVD properly and work with it. After unmounting the DVD 
and routing the USB drive to the linux guest (same kernel version), both host 
and guest become unresponsive and on the QEMU console I get the QEMU console 
flodded with the message:
USBDEVFS_CLEAR_HALT: Connection timed out
again and again, approx. each 10-20 seconds.

When I unplug the device from the host, the message
USBDEVFS_CLEAR_HALT: No such device
comes up in one block at least 100 times (my scrollback history of the display 
is limited, so I cannot say how often it actually appreared)

On the guest side linux, I see the following dmesg after having it routed from 
the host to the guest:
[  160.292231] usb 1-2.1: new full speed USB device using uhci_hcd and address 5
[  160.475762] usb 1-2.1: configuration #1 chosen from 1 choice
[  160.478553] scsi3 : SCSI emulation for USB Mass Storage devices
[  160.479689] usb-storage: device found at 5
[  160.480121] usb-storage: waiting for device to settle before scanning
[  165.494016] scsi 3:0:0:0: CD-ROM            slimtype  eTDU108   1     SL03 
PQ: 0 ANSI: 0

then, the guest stalls and on the host side the USBDEVFS_CLEAR_HALT
appears until I unplug the hardware from the host - pay also attention
on the stalled dmesg timestamp! The "real" timegap between the last line
above and the first line below is more than 20 seconds!

[  165.645735] usb 1-2.1: USB disconnect, address 5
[  165.663770] sr0: scsi3-mmc drive: 24x/24x cd/rw xa/form2 cdda pop-up
[  165.664416] sr 3:0:0:0: Attached scsi CD-ROM sr0
[  165.664623] sr 3:0:0:0: Attached scsi generic sg1 type 5
[  165.665565] usb-storage: device scan complete

The drive used is a self-powered LITEON External Slim DVD-ROM Drive (Model 
number eTDU108-02 1)
The power is not a problem, because the drive works fine on the host directly.

Best regards,

Erik

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/906221

Title:
  USBDEVFS_CLEAR_HALT stall with USB-CDROM qemu-1.0

Status in QEMU:
  New

Bug description:
  When connecting a USB DVD/CDROM drive to the linux host, it works fine and I 
can mount the inserted DVD properly and work with it. After unmounting the DVD 
and routing the USB drive to the linux guest (same kernel version), both host 
and guest become unresponsive and on the QEMU console I get the QEMU console 
flodded with the message:
  USBDEVFS_CLEAR_HALT: Connection timed out
  again and again, approx. each 10-20 seconds.

  When I unplug the device from the host, the message
  USBDEVFS_CLEAR_HALT: No such device
  comes up in one block at least 100 times (my scrollback history of the 
display is limited, so I cannot say how often it actually appreared)

  On the guest side linux, I see the following dmesg after having it routed 
from the host to the guest:
  [  160.292231] usb 1-2.1: new full speed USB device using uhci_hcd and 
address 5
  [  160.475762] usb 1-2.1: configuration #1 chosen from 1 choice
  [  160.478553] scsi3 : SCSI emulation for USB Mass Storage devices
  [  160.479689] usb-storage: device found at 5
  [  160.480121] usb-storage: waiting for device to settle before scanning
  [  165.494016] scsi 3:0:0:0: CD-ROM            slimtype  eTDU108   1     SL03 
PQ: 0 ANSI: 0

  then, the guest stalls and on the host side the USBDEVFS_CLEAR_HALT
  appears until I unplug the hardware from the host - pay also attention
  on the stalled dmesg timestamp! The "real" timegap between the last
  line above and the first line below is more than 20 seconds!

  [  165.645735] usb 1-2.1: USB disconnect, address 5
  [  165.663770] sr0: scsi3-mmc drive: 24x/24x cd/rw xa/form2 cdda pop-up
  [  165.664416] sr 3:0:0:0: Attached scsi CD-ROM sr0
  [  165.664623] sr 3:0:0:0: Attached scsi generic sg1 type 5
  [  165.665565] usb-storage: device scan complete

  The drive used is a self-powered LITEON External Slim DVD-ROM Drive (Model 
number eTDU108-02 1)
  The power is not a problem, because the drive works fine on the host directly.

  Best regards,

  Erik

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