Messages in this thread |  | | Date | Sat, 15 Feb 2014 11:37:48 +0800 | From | Li Zefan <> | Subject | Re: [PATCH cgroup/for-3.14-fixes] cgroup: update cgroup_enable_task_cg_lists() to grab siglock |
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On 2014/2/14 2:29, Tejun Heo wrote: > Currently, there's nothing preventing cgroup_enable_task_cg_lists() > from missing set PF_EXITING and race against cgroup_exit(). Depending > on the timing, cgroup_exit() may finish with the task still linked on > css_set leading to list corruption. Fix it by grabbing siglock in > cgroup_enable_task_cg_lists() so that PF_EXITING is guaranteed to be > visible. > > This whole on-demand cg_list optimization is extremely fragile and has > ample possibility to lead to bugs which can cause things like > once-a-year oops during boot. I'm wondering whether the better > approach would be just adding "cgroup_disable=all" handling which > disables the whole cgroup rather than tempting fate with this > on-demand craziness. > > Signed-off-by: Tejun Heo <tj@kernel.org> > Cc: stable@vger.kernel.org
Acked-by: Li Zefan <lizefan@huawei.com>
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