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[Robie Basak <1573095@xxxxxxxxxxxxxxxxxx>]

Here are full steps to reproduce this issue using tooling from Ubuntu
only:

uvt-simplestreams-libvirt sync release=bionic arch=amd64 label=release
uvt-kvm create --no-start lp1573095 release=bionic arch=amd64 label=release
virsh edit lp1573095  # delete <serial/> and <console/> blocks
virsh start lp1573095
uvt-kvm wait lp1573095

Expected behaviour: succeeds when the VM is available
Actual behaviour: hangs and eventually times out

Additionally you can examine the screen with virt-manager. On that screen, I
expect a login prompt. Instead I see nothing beyond the normal kernel messages
(nothing from userspace).

If you skip the serial/console definition deletion in the steps above, you'll
see that the VM works. In other words, the VM stops working if a serial port is
not available.

Workaround: remove console=ttyS0 from GRUB_CMD_LINUX_DEFAULT in
/etc/default/grub.d/50-cloudimg-settings.cfg, leaving only console=tty1, and
then run "sudo update-grub". However this must either be done on a system with
aserial port, or you have to jump through the appropriate hoops to be able to
get the result of "update-grub" happen without having booted the system. Note
that editing /etc/default/grub is insufficient since
/etc/default/grub.d/50-cloudimg-settings.cfg overrides it (see bug 1812752).


** Summary changed:

- 16.04 cloud image hangs at first boot
+ Cloud images fail to boot when a serial port is not available

** Changed in: ubuntu
       Status: Confirmed => Invalid

** Changed in: cloud-images
       Status: New => Confirmed

** Changed in: cloud-init
       Status: Fix Released => Invalid

** Description changed:

  I tried to launch a ubuntu 16.04 cloud image within KVM.
- The image is not booting up and hangs at 
+ The image is not booting up and hangs at
  
  "Btrfs loaded"
  
  Hypervisor env is Proxmox 4.1
+ 
+ [racb: see comment 40 for minimal steps to reproduce using Ubuntu-
+ provided tooling only)

** Description changed:

  I tried to launch a ubuntu 16.04 cloud image within KVM.
  The image is not booting up and hangs at
  
  "Btrfs loaded"
  
  Hypervisor env is Proxmox 4.1
  
  [racb: see comment 40 for minimal steps to reproduce using Ubuntu-
- provided tooling only)
+ provided tooling only]

-- 
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to cloud-init.
https://bugs.launchpad.net/bugs/1573095

Title:
  Cloud images fail to boot when a serial port is not available

Status in cloud-images:
  Confirmed
Status in cloud-init:
  Invalid
Status in Ubuntu:
  Invalid

Bug description:
  I tried to launch a ubuntu 16.04 cloud image within KVM.
  The image is not booting up and hangs at

  "Btrfs loaded"

  Hypervisor env is Proxmox 4.1

  [racb: see comment 40 for minimal steps to reproduce using Ubuntu-
  provided tooling only]

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