Bug 1435142

Created attachment 1265653 [details]
strace output

Zbigniew,
I know you do not like needinfo but I do not not get your attention.

BTW it is obvious that it fails because directory is created with wrong permissions

sh$ namei -mo /sys/fs/cgroup/pids/user.slice/user-20728.slice/user/testttt.scope
f: /sys/fs/cgroup/pids/user.slice/user-20728.slice/user/testttt.scope
 dr-xr-xr-x root root /
 dr-xr-xr-x root root sys
 drwxr-xr-x root root fs
 drwxr-xr-x root root cgroup
 dr-xr-xr-x root root pids
 drwxr-xr-x root root user.slice
 drwxr-xr-x root root user-20728.slice
 drwxr-xr-x root root user
                      testttt.scope - No such file or directory

sh$ grep EACC systemd.log 
mkdir("/sys/fs/cgroup/pids/user.slice/user-20728.slice/user/testttt.scope", 0755) = -1 EACCES (Permission denied)

This looks like the upstream bug doesn't it?
https://github.com/systemd/systemd/issues/3388

It is possible

sh# uname -r
4.11.0-2.fc26.x86_64

sh# grep cgroup /proc/self/mounts | grep unified
cgroup /sys/fs/cgroup/unified cgroup2 rw,nosuid,nodev,noexec,relatime 0 0

Do you have an idea why this systemd feature is not a priority for fedora/upstream? Because it does not work in f26+ and it is not fixed in oone of newst builds in rawhide systemd-234-1.fc27.

Is it a deprecated feature?

(In reply to Lukas Slebodnik from comment #6)
> Do you have an idea why this systemd feature is not a priority for
> fedora/upstream? Because it does not work in f26+ and it is not fixed in
> oone of newst builds in rawhide systemd-234-1.fc27.

In systemd as in any other open source project there are outstanding bugs just because so far there was no one who had enough time/motivation/knowledge to actually sit down and fix them. systemd is no exception here.

> 
> Is it a deprecated feature?

It is not. Unfortunately it doesn't work yet with hybrid cgroup hierarchy. As a workaround please revert to using legacy cgroup layout. Use following commands to do that and reboot.

grubby --update-kernel /boot/vmlinuz-$(uname -r) --args systemd.legacy_systemd_cgroup_controller=1

grubby --update-kernel /boot/vmlinuz-$(uname -r) --args systemd.unified_cgroup_hierarchy=0

Thank you very much for provided workaround. I added these options to GRUB_CMDLINE_LINUX in /etc/sysconfig/grub.

And good to know that it is not deprecated feature :-)

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Reproducible even on f27

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version prior this bug is closed as described in the policy above.

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