syzbot suspects this issue was fixed by commit:

commit 7ee285395b211cad474b2b989db52666e0430daf
Author: Waiman Long [off-list ref]
Date:   Sat Sep 18 22:53:08 2021 +0000

    cgroup: Make rebind_subsystems() disable v2 controllers all at once

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12232c06b00000
start commit:   442489c21923 Merge tag 'timers-core-2020-08-04' of git://g..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=b3f0df8558780a7d
dashboard link: https://syzkaller.appspot.com/bug?extid=9c08aaa363ca5784c9e9
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14148c62900000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: cgroup: Make rebind_subsystems() disable v2 controllers all at once

For information about bisection process see: https://goo.gl/tpsmEJ#bisection