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Bug#1108294: kernel 6.12 breaks cgroup awareness of openjdk 21



On Thu, 2025-06-26 at 18:24 +0200, Ben Hutchings wrote:
[...]
> Thank you for bringing this to our attention.
> 
> I don't think it makes sense for us to re-enable cgroups v1, given that
> it has been deprecated for so long and OpenJDK itself can use v2.
> 
> I will look into whether we can instead provide only a /proc/cgroups
> file, which seems to be all that OpenJDK actually needed.

In fact this may be as simple as reverting:

commit af000ce85293b8e608f696f0c6c280bc3a75887f
Author: Michal Koutný <mkoutny@suse.com>
Date:   Mon Sep 9 18:32:23 2024 +0200
 
    cgroup: Do not report unavailable v1 controllers in /proc/cgroups

but I have not yet tested that.

Ben.

-- 
Ben Hutchings
Quantity is no substitute for quality, but it's the only one we've got.

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