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Description of problem:
host kernel panics when assigning a usb audio device (logitech usb speaker) to a kvm guest.

Version-Release number of selected component (if applicable):
kernel-2.6.32-274.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Install guest (/me used rhel6, but probably doesn't matter).
2. Boot guest.
3. Start pulseaudio volume control on the host machine.
4. Assign usb speaker to the guest (virt-manager -> add hardware -> usb host device).
  
Actual results:
host kernel panics

Expected results:
host continues to run fine

Additional info:
With pulseaudio volume control not started it works just fine.

Most likely triggered by qemu sending usbfs ioctls (USBDEVFS_DISCONNECT or USBDEVFS_RESET) to the usb speakers while they are in use by pulse.

Created attachment 587398 [details]
screen shot (digicam)

Created attachment 587408 [details]
serial log #1

Created attachment 587411 [details]
serial console log #2

The ALSA USB driver was updated in recent RHEL 6.4 kernels.

Could you retest with the latest RHEL 6 kernel?

Tested with 2.6.32-344.el6.x86_64, working fine now.

Closing on the basis of comment 9...