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-1 port 1 (session ID: ec446fddf64c1a3d95b9cfa7fab1496facd7d6523b2dbdfc16eff961ab8c737a, active connections: 1).