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: <20191114224213.GN4163745@devbig004.ftw2.facebook.com>
Date:   Thu, 14 Nov 2019 14:42:13 -0800
From:   Tejun Heo <tj@...nel.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.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

Hello, Naresh.

On Thu, Nov 14, 2019 at 11:02:53AM +0530, Naresh Kamboju 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

Thanks.

-- 
tejun