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: 1cfd7bb6170b939f106ba09baa3b59c81a49e148bc3fef2685c18540e8dce993, active connections: 1).