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: 9ac3bee33140f427993aed485c16673ecd40a79b58c5ac8df0ac742f1ed2f375, active connections: 1).