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Re: [Qemu-devel] [PATCHv7 3/3] virtio: add features as qdev properties
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCHv7 3/3] virtio: add features as qdev properties |
Date: |
Tue, 12 Jan 2010 20:52:51 +0200 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
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