APPLIED: [PATCH 0/4] [focal/impish linux-aws] AWS: Hibernate resume crashes when platform changes

[Tim Gardner]

Applied to impish/linux-aws:master, focal/linux-aws:master. Thanks.

-rtg

On 3/19/22 10:10, Tim Gardner wrote:
> BugLink: https://bugs.launchpad.net/bugs/1965002
> 
> Even though these are all cherry-picks, there is enough fuzz that 'git am' won't do
> the job whereas 'git cherry-pick' does. Hence the 4 patches that are nearly identical.
> 
> SRU Justification
> 
> [Impact]
> 
> At present, if a virt instance is hibernated and restarted in a different environment,
> the instance will crash. We have seen situations where customers have to enable support
> cases to recover an instance. The proposed patch is supposed to enable the kernel to
> detect the change and reboot the instance instead of crashing. In the ACPI specification;
> there is a 'hardware signature' field in the ACPI tables, and the OS can reboot cleanly
> if/when that signature changes, instead of attempting the resume and crashing.
> 
> [Fix]
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=74d95555
> commit f6c46b1d62f8ffbf2cf6eb43ab0d277bd3f7e948 linux-next
> 
> [Test Case]
> 
> Hibernate an AWS instance, resume on a different platform. Positive test results from Amazon engineers.
> 
> [Where things could go wrong]
> 
> Resume currently crashes when a hibernated instance is migrated to a new machine. It can't
> get much worse, unless the initial hibernate fails.
> 
> [Other Info]
> 
> SF: #00330794
> 

-- 
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Tim Gardner
Canonical, Inc