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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1862888

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1862888

Title:
  Boot hang on ASUS WS X299 SAGE

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  [Impact]

  Upstream kernels since 5.3 fail to boot on the ASUS WS X299 SAGE
  motherboard with firmware version 1201. This is the result of an
  infinite loop while trying to parse a malformed ACPI table. It is
  suspected to affect other ASUS motherboards, but I have no first
  hand proof of that.

  This is particularly troublesome for bionic HWE installs, which
  will then fail to boot after upgrading to the 5.3 series eoan
  kernel.

  [Test Case]

  Try to boot an ASUS WS X299 SAGE computer with firmware version 1201.

  Eoan and Focal kernels will fail to boot.

  Upstream kernel 5.6-rc1 will boot succressfully.

  
  [Fix]

  Cherry pick upstream  2b73ea379624 ("x86/boot: Handle malformed SRAT
  tables during early ACPI parsing")

  [Regression Potential]

  Low. Any system affected by this patch is already failing to boot.

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