[Bug 1987541] Re: shim executes GRUB w/ dirty instruction cache on arm64

[Matthieu Clemenceau]

** Tags added: foundations-triage-discuss

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to shim in Ubuntu.
https://bugs.launchpad.net/bugs/1987541

Title:
  shim executes GRUB w/ dirty instruction cache on arm64

Status in shim package in Ubuntu:
  New

Bug description:
  [Impact]
  On arm64 platforms, GRUB may occasionally crash after being executed by shim. We're seeing it on the order of 1/100 boots.

  [Test Case]
  Put an arm64 server in a reboot loop. We're seeing this w/ a Cortex A72-based system (Nvidia Bluefield).

  [Fix]
  https://github.com/rhboot/shim/pull/504

  [What could go wrong]
  The only negative here would seem to be the performance impact of flushing the cache, which is unlikely to be noticeable.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/shim/+bug/1987541/+subscriptions