Hello, Frederic. 7e381b0eb1 ("cgroup: Drop task_lock(parent) on cgroup_fork()") removed task_lock from cgroup_fork citing that current->cgroups can't change due to threadgroup_change locking; however, threadgroup_change locking is used only during CLONE_THREAD forking. If @current is forking a new process, there's nothing preventing someone else to migrate the parent while forking is in progress and delete the css_set it currently is using. Am I confused somewhere? Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html