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: 594160906290d7f3f2947365dcd2c79aced54c68d0b9d69cab01910f6450eefa, active connections: 1).