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: 7aef22cdb318f525672f6b857594c1af629a560cb7a705ba565611e3f06254d1, active connections: 1).