Re: [PATCH 2/2] cgroup: check cgroup liveliness before unbreaking kernfs protection

On Tue, Sep 02, 2014 at 06:57:54PM +0800, Li Zefan wrote: > diff --git a/kernel/cgroup.c b/kernel/cgroup.c > index e03fc62..c8d07e5 100644 > --- a/kernel/cgroup.c > +++ b/kernel/cgroup.c > @@ -1025,6 +1025,11 @@ static umode_t cgroup_file_mode(const struct cftype > *cft) > return mode; > }

[PATCH 2/2] cgroup: check cgroup liveliness before unbreaking kernfs protection

When cgroup_kn_lock_live() is called through some kernfs operation and another thread is calling cgroup_rmdir(), we may trigger the warning in cgroup_get(). [ cut here ] WARNING: CPU: 1 PID: 1228 at kernel/cgroup.c:1034 cgroup_get+0x89/0xa0() ... Call Trace: [] dump_stack+