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: ed02a09704dbe4758fcd3b1c70b149a07a785599d4acd5a9f9f8e1bd6f172d72, active connections: 1).