linux-kernel - Re: [PATCH v2] cgroup: fix top cgroup refcnt leak

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Date:	Sat, 15 Feb 2014 17:31:42 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH v2] cgroup: fix top cgroup refcnt leak

On 2014/2/15 12:03, Li Zefan wrote:
> If we mount the same cgroupfs in serveral mount points, and then
> umount all of them, kill_sb() will be called only once.
> 
> Therefore it's wrong to increment top_cgroup's refcnt when we find
> an existing cgroup_root.
> 
> Try:
>         # mount -t cgroup -o cpuacct xxx /cgroup
>         # mount -t cgroup -o cpuacct xxx /cgroup2
>         # cat /proc/cgroups | grep cpuacct
>         cpuacct 2       1       1
>         # umount /cgroup
>         # umount /cgroup2
>         # cat /proc/cgroups | grep cpuacct
>         cpuacct 2       1       1
> 
> You'll see cgroupfs will never be freed.
> 
> v2: change to take the refcnt and drop it after kernfs_mount().
> 
> Signed-off-by: Li Zefan <lizefan@...wei.com>

Please hold off applying this patch. It's still buggy.

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