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

[Launchpad Bug Tracker]

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

[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.

** Affects: shim (Ubuntu)
     Importance: High
         Status: New


** Tags: foundations-triage-discuss
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shim executes GRUB w/ dirty instruction cache on arm64
https://bugs.launchpad.net/bugs/1987541
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