[Bug 1982511] Re: Intermittent "Synchronous Exception" on arm64

[Julian Andres Klode]

** Changed in: grub2-unsigned (Ubuntu)
     Assignee: (unassigned) => Julian Andres Klode (juliank)

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Title:
  Intermittent "Synchronous Exception" on arm64

Status in grub2-unsigned package in Ubuntu:
  Invalid
Status in grub2-unsigned source package in Bionic:
  Triaged
Status in grub2-unsigned source package in Focal:
  Triaged
Status in grub2 package in Debian:
  Fix Released

Bug description:
  [Impact]
  EFI-based arm64 systems will sometimes hang during (re-)boot due to a synchronous exception while starting GRUB. This is reproducible on focal systems that use our prebuilt grubaa64.efi.signed image, but may not impact systems that generate their own grubaa64.efi using focal's grub-mkimage.

  [Test Case]
  Put an arm64 system in a reboot loop. Wait. A system can survive hundreds of reboots before hitting the problem. Currently this has only been reported on Bluefield hardware.

  [Fix]
  https://git.savannah.gnu.org/cgit/grub.git/commit/?id=c0e647eb0e2bd09315612446cb4d90f7f75cb44c

  Since this is in the grub-mkimage tool as built by grub-unsigned, not
  grub2, it likely only impacts the images grub2-unsigned generates at
  build time.

  [What could go wrong]
  This could screw up the section calculations in a different way, possibly causing a similar problem to pop up somewhere else.

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