[Bug 1982511] [NEW] Intermittent "Synchronous Exception" on arm64

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You have been subscribed to a public bug by Julian Andres Klode (juliank):

[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.

** Affects: grub2-unsigned (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: grub2-unsigned (Ubuntu Bionic)
     Importance: High
         Status: New

** Affects: grub2-unsigned (Ubuntu Focal)
     Importance: High
         Status: Confirmed

** Affects: grub2 (Debian)
     Importance: Unknown
         Status: Fix Released


** Tags: foundations-triage-discuss
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Intermittent "Synchronous Exception" on arm64
https://bugs.launchpad.net/bugs/1982511
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