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

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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.
> 

You are right, it's been deprecated for quite some time, and this is
clearly a bug in openjdk, but currently there is no better version of
JDK21. I am not sure what you mean by "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.
> 

How is this supposed to work? Since we are talking about the host system
here you cannot know how /proc was mounted in the container, which
Container framework is involved, or whether the container is based on
Debian at all.

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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
  Processed: Re: kernel 6.12 breaks cgroup awareness of openjdk 21 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-07-09 00:50 +0200
  Bug#1108294: marked as done (kernel 6.12 breaks cgroup awareness  of openjdk 21) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-07-11 09:10 +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
  Bug#1108294: 洗澡最危险 寒冬“10大易猝死行为”曝光 Alan Zhou <avianrobles359@gmail.com> - 2025-09-19 03:20 +0200

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