Re: [Qemu-devel] [PATCHv7 3/3] virtio: add features as qdev properties

[Michael S. Tsirkin]

On Tue, Jan 12, 2010 at 07:09:27PM +0100, Christoph Hellwig wrote:
> This patch causes 100% reproducible boot panics in a Linux guest using
> virtio.
> 
> My qemu command line is:
> 
> /opt/qemu/bin/qemu-system-x86_64 \
>         -m 1500 \
>       -enable-kvm \
>       -drive 
> file=/dev/vg00/qemu-root,if=virtio,media=disk,cache=none,aio=threads \
>       -kernel arch/x86/boot/bzImage \
>       -append "root=/dev/vda console=tty0 console=ttyS0,38400n8" \
>       -nographic
> 
> and the guest dmesg is:
> 
> [    2.578083] virtio-pci 0000:00:04.0: PCI INT A -> Link[LNKD] -> GSI
> 10 (level, high) -> IRQ 10
> [    2.583111] blk_queue_max_segment_size: set to minimum 4096
> [    2.584651]  vda:
> [    2.585075] BUG: unable to handle kernel NULL pointer dereference at (null)

Um, I see this too. Debugging.

-- 
MST