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

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On Thu, 2025-06-26 at 19:17 +0200, Ben Hutchings wrote:
> 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.

Yes, this seems to work.

I compiled the following class:

--- BEGIN ---
import java.lang.System;

class Main {
    public static void main(String[] args) {
	int count = Integer.parseInt(args[0]);
	char[] one_mb;
	int i;

	for (i = 0; i != count; i++) {
	    one_mb = new char[0x100000];
	    System.out.println(one_mb[0] | one_mb[0xfffff]);
	}
    }
};
--- END ---

and ran it with an argument of "1000".

I used a podman container of Debian limited to 50 MiB.  With the current
kernel from trixie, it OOMs.  With that commit reverted, it runs to
completion.

I will open an MR tomorrow.

Ben.

-- 
Ben Hutchings
73.46% of all statistics are made up.

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Bug#1108294: kernel 6.12 breaks cgroup awareness of openjdk 21 Harald Dunkel <harri@afaics.de> - 2025-06-25 09:10 +0200
  Bug#1108294: kernel 6.12 breaks cgroup awareness of openjdk 21 Ben Hutchings <ben@decadent.org.uk> - 2025-06-26 18:30 +0200
    Bug#1108294: kernel 6.12 breaks cgroup awareness of openjdk 21 Ben Hutchings <ben@decadent.org.uk> - 2025-06-26 19:20 +0200
      Bug#1108294: kernel 6.12 breaks cgroup awareness of openjdk 21 Ben Hutchings <ben@decadent.org.uk> - 2025-07-09 00:50 +0200
        Bug#1108294: kernel 6.12 breaks cgroup awareness of openjdk 21 Ben Hutchings <ben@decadent.org.uk> - 2025-07-09 14:00 +0200
    Bug#1108294: kernel 6.12 breaks cgroup awareness of openjdk 21 Harald Dunkel <harri@afaics.de> - 2025-06-26 20:50 +0200
      Bug#1108294: kernel 6.12 breaks cgroup awareness of openjdk 21 Ben Hutchings <ben@decadent.org.uk> - 2025-06-29 14:30 +0200
  Bug#1108294: kernel 6.12 breaks cgroup awareness of openjdk 21 Ben Hutchings <ben@decadent.org.uk> - 2025-06-26 18:50 +0200
  Bug#1108294: kernel 6.12 breaks cgroup awareness of openjdk 21 Bastian Blank <waldi@debian.org> - 2025-06-26 20:30 +0200
  Bug#1108294: [PATCH 4/4] cgroup: Do not report unavailable v1 controllers in /proc/cgroups Harald Dunkel <harri@afaics.de> - 2025-07-14 08:30 +0200
  Bug#1108294: [PATCH 4/4] cgroup: Do not report unavailable v1 controllers in /proc/cgroups Harald Dunkel <harald.dunkel@aixigo.com> - 2025-07-21 10:00 +0200
    Bug#1108294: [PATCH 4/4] cgroup: Do not report unavailable v1 controllers in /proc/cgroups Salvatore Bonaccorso <carnil@debian.org> - 2025-07-27 17:00 +0200

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