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: 0ceb736ef145edf47c31a04d146b9af768d808cfb1bbb9152c9e0c6c7c77ad06, active connections: 1).