kernel: protection fault trap, code=0

Stopped at      vio_populate_rx_mbufs+0xae:     movl    0x8(%r13),%esi

ddb> serialport: Connected to syzkaller.us-central1-b.ci-openbsd-main-test-2 port 1 (session ID: b3185fb307948836c54c35ceb3d3386810dd45eaeef3f23e05039aa8a486336f, active connections: 1).