Ubuntu
linux package

  1. Noble (24.04)
  2. Bug #2067862
  3. Comment #3

Comment 3 for bug 2067862

Revision history for this message
Dong Liang (qidong-ld) wrote : Re: remove virtio legacy device make kernel Oops

Hi Matthew Ruffell
First of all, thank you for your response.

If you want to reproduce this issue, you can try the following steps:

 1. Boot the Ubuntu 24 system and modify the kernel boot parameters to include virtio_pci.force_legacy=1.
 2. Use perf-tools or ftrace to trace the return value of the virtio_pci_legacy_probe function.
 3. Insert a virtio network card or disk, and observe the return value of the virtio_pci_legacy_probe function within the guest OS to confirm a successful return of 0x0, indicating that the virtio device has been enabled using virtio_pci_legacy_probe.
 4. Remove the network card or disk, and you should be able to reproduce the issue.

I have installed and tested the test kernel you built on Ubuntu 24, and it's working fine. Additionally, I have also backported the patch from https://github.com/torvalds/linux/commit/c8fae27d141a32a1624d0d0d5419d94252824498 (virtio-pci: Check if is_avq is NULL) and compiled the Ubuntu kernel, which also has no issues.