linux-kernel - Re: linux-next: arm32: beagleboard x15: WARNING: CPU: 0 PID: 0 at /usr/src/kernel/kernel/cgroup/cgroup.c:1969 cgroup_setup

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Message-ID: <CA+G9fYu-w+3qgkGet4B4NeBxQNaXoWij49j0WRwPAYELgakb6w@mail.gmail.com>
Date:   Fri, 15 Nov 2019 14:28:43 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     cgroups@...r.kernel.org,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        namhyung@...nel.org, open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org, lizefan@...wei.com,
        hannes@...xchg.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, kafai@...com,
        Song Liu <songliubraving@...com>
Subject: Re: linux-next: arm32: beagleboard x15: WARNING: CPU: 0 PID: 0 at
 /usr/src/kernel/kernel/cgroup/cgroup.c:1969 cgroup_setup_root+0x36c/0x4e8

Hi Tejun,

On Fri, 15 Nov 2019 at 04:12, Tejun Heo <tj@...nel.org> wrote:
> > [    0.015402] WARNING: CPU: 0 PID: 0 at /usr/src/kernel/kernel/cgroup/cgroup.c:1969
> > cgroup_setup_root+0x36c/0x4e8
> ...
> > [    0.015726] [<c053ac48>] (cgroup_setup_root) from [<c1c2a260>]
> > (cgroup_init+0x108/0x560)
>
> So, that's saying that the initial kernfs_node ino allocation returned
> something other than 1.  Hmmm... x86_32 works fine.  What does the
> following say?
>
> # mkdir -p /tmp/cgroup2
> # mount -t cgroup2 none /tmp/cgroup2
> # ls -lid /tmp/cgroup2


 mkdir -p /tmp/cgroup2
 mount -t cgroup2 none /tmp/cgroup2
 ls -lid /tmp/cgroup2
 1 dr-xr-xr-x 5 root root 0 Nov 15 08:00 /tmp/cgroup2


Full test log link,
https://lkft.validation.linaro.org/scheduler/job/1011451#L1170

- Naresh