Public bug reported:

[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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: cherry-pick eoan focal

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

Title:
  Boot hang on ASUS WS X299 SAGE

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