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-0 port 1 (session ID: 927e1836b6ebf68cbb268efd69fa5b545d9640df8092abbb695dc153124f3eb7, active connections: 1).