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

[Doug Goldstein]

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

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