[Bug 1711358] Re: 20170817 - ISO hangs on boot on qemu with splash screen enabled and qxl graphics driver

[Stefan Bader]

Just as an update as I do not know how much gets accomplished here this
week. The info from the crash indicates that some swap linked list which
is supposed to be empty seems to have some elements on it. There is no
obvious change related to that in 4.14~rc1 (which is the upstream
version the tested kernel is based on). So we need to figure out what
would be the change which we need. Some reference counting feels like
maybe could be related but hard to say and we might need to bisect to
find it.

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Title:
  20170817 - ISO hangs on boot on qemu with splash screen enabled and
  qxl graphics driver

Status in linux package in Ubuntu:
  Confirmed
Status in plymouth package in Ubuntu:
  Confirmed
Status in ubiquity package in Ubuntu:
  Confirmed

Bug description:
  Test Case
  1. Boot artful desktop 20170817 under qemu with qxl
  2. Wait until ubiquity-dm is displayed

  Expected result
  It boots

  Actual result
  It hangs on the splash screen and the dots below the Ubuntu logo are not blinking. If the option 'splash' is removed from the boot command line it boots successfully.

  It also boots successfully with -vga std but in this case the splash
  screen is in text mode not graphical unlike with the qxl driver.

  - It started with kernel 4.12.
  - It is still happening with kernel 4.13.
  - It only happens when booting from an ISO and not on an installed system.
  - It works with cirrus/vga, but not qxl
  - It works if nosplash is set (or splash removed from the boot command line)
  - It works on Xenial but not on Artful

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