The first patch describes the bug and the reproducer. The VQ poll handler that is called by mistake within virtio_scsi_dataplane_stop enters a dead loop because it fails to detect an error state. Fix both sides of the problem: the handler should break out from the loop if no progress can be made due to virtio_error; the handler shouldn't be called in that situation in the first place.
Fam Zheng (2): virtio: Return true from virtio_queue_empty if broken virtio-scsi/virtio-blk: Disable poll handlers when stopping vq handler hw/block/dataplane/virtio-blk.c | 2 ++ hw/scsi/virtio-scsi-dataplane.c | 2 ++ hw/virtio/virtio.c | 8 ++++++++ 3 files changed, 12 insertions(+) -- 2.17.1
