Linux 7.0 cgroups no longer allow user systemd unit files to access devices
Posted by digiphaze@reddit | linuxadmin | View on Reddit | 15 comments
Posted by digiphaze@reddit | linuxadmin | View on Reddit | 15 comments
BloodyIron@reddit
There's more info you should share here, namely what distro you're rocking and the major.minor versioning of it, as there could be more going on here in other aspects.
digiphaze@reddit (OP)
Sorry its a Ubuntu 26.04 install. Linux 7.0 This exact "user" unit file worked fine on kernel 6.18 and Ubuntu 25.10, now it keeps getting denied access to the GPU.
dodexahedron@reddit
If you can't follow a conversation thread, it's not my problem.
You're arguing against a strawman you invented in your head because your complaint has nothing to do with what I was even saying.
Chill.
bl00donthekeys@reddit
Says the person starting an argument outside of the thread in question. Who is it that can't follow conversation threads? lmao
dodexahedron@reddit
I didnt start anything. I literally supported someone's comment. That's all. Seriously. WTF?
Large-Cress900@reddit
Yeah, this is a known pain point with EL7 reaching EOL. The cgroup v1 behavior is getting more restrictive as upstream pushes everything toward cgroup v2.
If you're stuck on EL7 for now, check if
loginctl enable-linger <username>helps — it allows user services to persist without an active login session and sometimes fixes the cgroup delegation issue.But honestly, if you're hitting this kind of breakage, it's a strong signal to start planning the migration to EL9 (Rocky/Alma). I went through it last year and the cgroup v2 + systemd 252 combo is so much cleaner. The migration is painful for a week but saves you months of patching workarounds on a dying OS.
Are you running anything on these boxes that makes the migration hard? Sometimes the blocker is just one legacy app that needs a specific kernel.
PipeItToDevNull@reddit
I'm looking to use linger to allow rootless Podman usage through cicd
Is there some other trick besides linger you know of?
BloodyIron@reddit
Ignore what /u/Large-Cress900 is saying, they're referring to RHEL7 effectively, and not the Linux Kernel 7.0 which is the actual original topic of this thread. This person Large-Cress900 is going down the wrong rabbit hole.
Large-Cress900@reddit
You're right, my bad — I misread the title and jumped straight to EL7 in my head. Thanks for the correction. For the actual kernel 7.0 cgroup changes: do you know if this is a complete removal of cgroup v1 support or just stricter defaults for user-level delegation? I'd be curious to see what the migration path looks like for services that still rely on v1 hierarchy.
BloodyIron@reddit
I do not know the inner details of this particular change, sorry I can't be more helpful.
zmttoxics2@reddit
Pretty sure they meant Linux kernel 7.0 (they even say Ubuntu 26.04), not RHEL 7.
dodexahedron@reddit
Yeah... And EL 7 has been EoL for a long while now. It is even out of extended maintenance. So if you're still on EL7, you already have to be shelling out for ELS, to begin with, or you're running on borrowed time. Migration pain from that in 2026 is a problem of your own making. Even EL8 is getting harder and harder to keep updated, since it went maintenance-only at the same time 7 went ELS, and even then that still means you have to be on 8.10 specifically since some time last year.
For 9, 9.4 and 9.6 are in EUS, with 9.4 going to ELS at the end of April ($$$).
10 is already at 10.1 and 10.0 has been ELS since some time last year.
The standard lifecycle for EL is 10 years per major version, from release date, provided you keep up with minor versions, with even numbered minor versions being "LTS" but still only getting the same 6 months as odd releases before going to EUS for 3.5 more years after that.
BloodyIron@reddit
EL7... is RED HAT Linux, not Linux THE KERNEL. You're somehow not even reading the word "kernel" which /u/zmttoxics2 clearly stated in their one sentence response.
Maybe go have some coffee and take a walk?
dodexahedron@reddit
Homie... I know... I was responding backing up that point. Not everything is an argument. 🙄
BloodyIron@reddit
You said "Yeah" and then proceeded to talk about completely irrelevant information about how EL7 has been EoL.
No, you do not know, and you're not paying attention. This isn't an argument, this is pointing out you're not even actually paying attention to what this thread is about.
Whatever, go away, now you're wasting my time when I just tried to redirect you to what the topic was actually about and now you're... arguing with me... SMH