Ubuntu
linux package

  1. Bug #1190120
  2. Comment #23

Comment 23 for bug 1190120

Revision history for this message
Matt Bruzek (mbruzek) wrote : Re: Kernel Oops - unable to handle kernel NULL pointer dereference; after unbind of a PCI device

Christopher Penalver,

I finally got a chance to install 13.10 Saucy and retry this problem. The new unbind problem happens exactly described above. Reminder I am following these instructions: http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM

I happened to be root while running the unbind command and the result of the command kicks me out of root back to my normal user. Had I been a normal user I am not sure I would have found this bug as a normal user because the sudo command returns you to normal user after complete.

root@apocalypse:/home/bruzer# echo 0000:01:00.0 > /sys/bus/pci/devices/0000\:01\:00.0/driver/unbind
bruzer@apocalypse:~$

The kernel does not crash as before, but I don't think the unbind command is working properly in this situation. I think it is clear the kernal oops problem is gone but the unbind step in the list does not work.