Gist to reproduce tdp_mmu root invalidation issue

tdp-mmu-issue-repro.sh

#!/bin/bash

set -xe

fetch_flatcar () 
{ 
    sudo apt-get update
    sudo apt-get install -y qemu-system-x86 lbzip2
    local channel=$1;
    local version=${2:-current};
    local machine=$(uname -m);
    local arch=;
    if [[ ${machine} = "aarch64" ]]; then
        arch=arm64-usr;
    else
        if [[ ${machine} = "x86_64" ]]; then
            arch=amd64-usr;
        fi;
    fi;
    local base=https://$channel.release.flatcar-linux.net/${arch}/${version};
    wget $base/flatcar_production_qemu.sh;
    wget $base/flatcar_production_qemu_image.img.bz2;
    lbunzip2 -kvf flatcar_production_qemu_image.img.bz2
    chmod +x flatcar_production_qemu.sh
    sed -i -e 's/VM_NCPUS=.*/VM_NCPUS="1"/' flatcar_production_qemu.sh
}

[ -f flatcar_production_qemu_image.img ] || fetch_flatcar stable

cat <<EOF >config.json
{
  "ignition": {
    "version": "3.3.0"
  },
  "storage": {
    "files": [
      {
        "group": {
          "id": 500
        },
        "overwrite": true,
        "path": "/home/core/.bashrc",
        "user": {
          "id": 500
        },
        "contents": {
          "compression": "",
          "source": "data:,sudo%20shutdown%20-h%20now%0A"
        },
        "mode": 420
      }
    ]
  }
}
EOF

# first run is meant to take a bit longer due to processing provisioning
# data, subsequent runs should be stable.
time sudo ./flatcar_production_qemu.sh -i config.json -nographic -m 4096