venus: abort when stuck
This gives
MESA-VIRTIO: debug: stuck in ring seqno wait with iter at 4096
MESA-VIRTIO: debug: stuck in ring seqno wait with iter at 8192
MESA-VIRTIO: debug: stuck in ring seqno wait with iter at 12288
MESA-VIRTIO: debug: stuck in ring seqno wait with iter at 16384
MESA-VIRTIO: debug: aborting
Aborted
which should be more friendly than printing the messages forever.
On my i7-7820HQ, this aborts after roughly 4+8+16+32=60 seconds
Edited by Chia-I Wu