Re: [Qemu-devel] assert hit on master with q35 machine type

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

copying in Stefan since it's his commit.

* Doug Goldstein (cardoe@cardoe.com) wrote:
> I'm currently hitting an assert on master. I've bisected the change down
> to aff8fd18f1786fc5af259a9bc0077727222f51ca but obviously that's a false
> positive because that adds the assert for the condition. So obviously
> the issue was introduced prior to this. As another data point the issue
> only occurs with q35 machines and will only happen with pc-q35-2.7 and
> pc-q35-2.8 (and obviously the aliased q35). If I use pc-q35-2.6 it does
> not hit.
> 
> The message is: qemu-system-x86_64:
> /home/doug/work/qemu/hw/virtio/virtio.c:214:
> virtio_queue_set_notification: Assertion `vq->notification_disabled > 0'
> failed.
> 
> But that clearly just shows its the assert that was added in that
> commit. To create the machine I use the following command line:
> 
> ./work/qemu/x86_64-softmmu/qemu-system-x86_64 -enable-kvm -M pc-q35-2.8
> -device intel-iommu -cpu host -m 2048 -smp 2 -drive
> if=pflash,format=raw,file=/tmp/tmp.Sno2BP3saP -global
> isa-debugcon.iobase=0x402 -debugcon file:/tmp/tmp.KCrwM98Mus -monitor
> stdio -chardev socket,host=127.0.0.1,port=4455,id=S0,server,nowait
> -device isa-serial,chardev=S0 -device piix3-usb-uhci -device usb-tablet
> -netdev id=net0,type=tap -device virtio-net-pci,netdev=net0 -boot
> order=n -device qxl-vga -gdb tcp::1234
> 
> It happens almost right away. Let me know how I can help track this down
> further.
> 
> Thanks.
> -- 
> Doug Goldstein
> 


--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK