On Thu, Mar 3, 2016 at 1:44 PM, Haggai Eran <haggaie@xxxxxxxxxxxx> wrote: > On 03/03/2016 05:18, Parav Pandit wrote: >> On Thu, Mar 3, 2016 at 1:28 AM, Parav Pandit <pandit.parav@xxxxxxxxx> wrote: >>> On Wed, Mar 2, 2016 at 11:09 PM, Tejun Heo <tj@xxxxxxxxxx> wrote: >>>> Nothing seems to prevent @cg from going away if this races with >>>> @current being migrated to a different cgroup. Have you run this with >>>> lockdep and rcu debugging enabled? This should have triggered a >>>> warning. >> I am able to reproduce this race. Looking into how to address it. > > If I understand correctly, task_css() requires rcu read lock being held. > Is task_get_css() suitable here? Yes. Its suitable if we continue with newer API to drop "num" entries. Or I will have make minor modification to support that in cgroup.h. There is no variation as task_get_css_many, but its minor change anyway. I saw slept off yesterday night, saw today morning. Will test over weekend and wait for Tejun's opinion if there is any. -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
