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: d6dc3a4b1751355db21961351e83d54ed7fbc6f1fb86a23cf051dd389e632f47, active connections: 1).