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

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

Title:
  Boot hang on ASUS WS X299 SAGE

Status in linux package in Ubuntu:
  Confirmed

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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