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[Bug 1818197] Re: ubuntu-18.04-server-cloudimg-arm64.img often fails to set the cloud-localds password under QEMU

 

Tracked in Github Issues as https://github.com/canonical/cloud-
init/issues/3343

** Bug watch added: github.com/canonical/cloud-init/issues #3343
   https://github.com/canonical/cloud-init/issues/3343

** Changed in: cloud-init
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1818197

Title:
  ubuntu-18.04-server-cloudimg-arm64.img often fails to set the cloud-
  localds password under QEMU

Status in cloud-images:
  New
Status in cloud-init:
  Expired

Bug description:
  On an Ubuntu 18.10 host, QEMU 2.12.0, I try to run the cloudimage with
  the script shown at the end of this description.

  Result: many times, I end up on the user / password prompt, but the
  password I chose with cloud-localds was not set.

  It is not deterministic, but it happens very often. Sometimes password
  worked. And very rarely, it shows a stack trace on the terminal, but
  most times just fails silently.

  The test script:

  ```
  set -eux

  # Parameters.
  id=ubuntu-18.04-server-cloudimg-arm64
  img="${id}.img"
  img_snapshot="${id}.img.snapshot.qcow2"
  flash0="${id}-flash0.img"
  flash1="${id}-flash1.img"
  user_data="${id}-user-data"
  user_data_img="${user_data}.img"

  # Install dependencies.
  pkgs='cloud-image-utils qemu-system-arm qemu-efi'
  if ! dpkg -s $pkgs >/dev/null 2>&1; then
    sudo apt-get install $pkgs
  fi

  # Get the image.
  if [ ! -f "$img" ]; then
    wget "https://cloud-images.ubuntu.com/releases/18.04/release/${img}";
  fi

  # Create snapshot.
  if [ ! -f "$img_snapshot" ]; then
    qemu-img \
      create \
      -b "$img" \
      -f qcow2 \
      "$img_snapshot" \
      1T \
    ;
  fi

  # Set the password.
  if [ ! -f "$user_data" ]; then
    cat >"$user_data" <<EOF
  #cloud-config
  password: asdfqwer
  chpasswd: { expire: False }
  ssh_pwauth: True
  EOF
    cloud-localds "$user_data_img" "$user_data"
  fi

  # Firmware.
  if [ ! -f "$flash0" ]; then
    dd if=/dev/zero of="$flash0" bs=1M count=64
    dd if=/usr/share/qemu-efi/QEMU_EFI.fd of="$flash0" conv=notrunc
  fi
  if [ ! -f "$flash1" ]; then
    dd if=/dev/zero of="$flash1" bs=1M count=64
  fi

  # Run.
  qemu-system-aarch64 \
    -machine virt \
    -cpu cortex-a57 \
    -device rtl8139,netdev=net0 \
    -device virtio-blk-device,drive=hd0 \
    -drive "if=none,file=${img_snapshot},id=hd0" \
    -drive "file=${user_data_img},format=raw" \
    -m 2G \
    -netdev user,id=net0 \
    -nographic \
    -pflash "$flash0" \
    -pflash "$flash1" \
    -smp 2 \
    "$@" \
  ;
  ```

  A stack trace that I saw once (rare):

  ```
  # [  113.002366] cloud-init[528]: Cloud-init v. 18.4-0ubuntu1~18.04.1 running 'init' at Thu, 17 Jan 2019 00:22:16 +0000. Up 105.40 seconds.
  # [  113.020759] cloud-init[528]: ci-info: +++++++++++++++++++++++++++Net device info++++++++++++++++++++++++++++
  # [  113.031208] cloud-init[528]: ci-info: +--------+-------+-----------+-----------+-------+-------------------+
  # [  113.041449] cloud-init[528]: ci-info: | Device |   Up  |  Address  |    Mask   | Scope |     Hw-Address    |
  # [  113.051615] cloud-init[528]: ci-info: +--------+-------+-----------+-----------+-------+-------------------+
  # [  113.061778] cloud-init[528]: ci-info: | enp0s1 | False |     .     |     .     |   .   | 52:54:00:12:34:56 |
  # [  113.071307] cloud-init[528]: ci-info: |   lo   |  True | 127.0.0.1 | 255.0.0.0 |  host |         .         |
  # [  113.088462] cloud-init[528]: ci-info: |   lo   |  True |  ::1/128  |     .     |  host |         .         |
  # [  113.097037] cloud-init[528]: ci-info: +--------+-------+-----------+-----------+-------+-------------------+
  # [  113.100513] cloud-init[528]: ci-info: +++++++++++++++++++Route IPv6 info+++++++++++++++++++
  # [  113.103872] cloud-init[528]: ci-info: +-------+-------------+---------+-----------+-------+
  # [  113.107605] cloud-init[528]: ci-info: | Route | Destination | Gateway | Interface | Flags |
  # [  113.111566] cloud-init[528]: ci-info: +-------+-------------+---------+-----------+-------+
  # [  113.115000] cloud-init[528]: ci-info: +-------+-------------+---------+-----------+-------+
  # [  113.118441] cloud-init[528]: 2019-01-17 00:22:23,983 - util.py[WARNING]: failed stage init
  # [  113.238277] cloud-init[528]: failed run of stage init
  # [  113.252444] cloud-init[528]: ------------------------------------------------------------
  # [  113.255576] cloud-init[528]: Traceback (most recent call last):
  # [  113.268398] cloud-init[528]:   File "/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 658, in status_wrapper
  # [  113.272674] cloud-init[528]:     ret = functor(name, args)
  # [  113.285055] cloud-init[528]:   File "/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 362, in main_init
  # [  113.288945] cloud-init[528]:     init.apply_network_config(bring_up=bool(mode != sources.DSMODE_LOCAL))
  # [  113.293122] cloud-init[528]:   File "/usr/lib/python3/dist-packages/cloudinit/stages.py", line 671, in apply_network_config
  # [  113.304953] cloud-init[528]:     return self.distro.apply_network_config(netcfg, bring_up=bring_up)
  # [  113.309150] cloud-init[528]:   File "/usr/lib/python3/dist-packages/cloudinit/distros/__init__.py", line 178, in apply_network_config
  # [  113.322181] cloud-init[528]:     dev_names = self._write_network_config(netconfig)
  # [  113.327226] cloud-init[528]:   File "/usr/lib/python3/dist-packages/cloudinit/distros/debian.py", line 114, in _write_network_config
  # [  113.341030] cloud-init[528]:     return self._supported_write_network_config(netconfig)
  # [  113.353698] cloud-init[528]:   File "/usr/lib/python3/dist-packages/cloudinit/distros/__init__.py", line 93, in _supported_write_network_config
  # [  113.358591] cloud-init[528]:     renderer.render_network_config(network_config)
  # [  113.376713] cloud-init[528]:   File "/usr/lib/python3/dist-packages/cloudinit/net/renderer.py", line 56, in render_network_config
  # [  113.381516] cloud-init[528]:     templates=templates, target=target)
  # [  113.385465] cloud-init[528]:   File "/usr/lib/python3/dist-packages/cloudinit/net/netplan.py", line 210, in render_network_state
  # [  113.389682] cloud-init[528]:     self._netplan_generate(run=self._postcmds)
  # [  113.393637] cloud-init[528]:   File "/usr/lib/python3/dist-packages/cloudinit/net/netplan.py", line 217, in _netplan_generate
  # [  113.397718] cloud-init[528]:     util.subp(self.NETPLAN_GENERATE, capture=True)
  # [  113.401648] cloud-init[528]:   File "/usr/lib/python3/dist-packages/cloudinit/util.py", line 2067, in subp
  # [  113.405796] cloud-init[528]:     cmd=args)
  # [  113.411233] cloud-init[528]: cloudinit.util.ProcessExecutionError: Unexpected error while running command.
  # [  113.416694] cloud-init[528]: Command: ['netplan', 'generate']
  # [  113.420785] cloud-init[528]: Exit code: -11
  # [  113.424647] cloud-init[528]: Reason: -
  # [  113.428686] cloud-init[528]: Stdout:
  # [  113.431914] cloud-init[528]: Stderr:
  # [  113.435345] cloud-init[528]: ------------------------------------------------------------
  ```

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