euler inclusion
category: bugfix
bugzilla: 8883
CVE: NA

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If a cgroup root is dying, show its hierarchy_id and num_cgroups
as 0.
Signed-off-by: NZefan Li <lizefan@huawei.com>
Tested-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NHanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: NBixuan Cui <cuibixuan@huawei.com>
Reviewed-by: NMiao Xie <miaoxie@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>