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-2 port 1 (session ID: e3485cd929a20f6b191b2de0b273e6b0db675b8b06b72ea6087f4703e64a5639, active connections: 1).