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: 2e6be00378d7612ce2736b86c4b2bc759edcff8feb4c9dafb2c6e4cdc95e2e44, active connections: 1).