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: 4269978da09a7781c1cdf90f15cce6753a6515482a6ccef544c3711da942b51f, active connections: 1).