On 07/18/2017 05:57 PM, Tejun Heo wrote: > On subsystem registration, css_populate_dir() is not called on the new > root css, so the interface files for the subsystem on cgrp_dfl_root > aren't created on registration. This is a residue from the days when > cgrp_dfl_root was used only as the parking spot for unused subsystems, > which no longer is true as it's used as the root for cgroup2. > > This is often fine as later operations tend to create them as a part > of mount (cgroup1) or subtree_control operations (cgroup2); however, > it's not difficult to mount cgroup2 with the controller interface > files missing as Waiman found out. > > Fix it by invoking css_populate_dir() on the root css on subsys > registration. > > Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> > Reported-by: Waiman Long <longman@xxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx # v4.5+ > --- > Hello, Waiman. > > Can you please verify that this fixes the bug? > Yes, this patch fix the problem. Tested-by: Waiman Long <longman@xxxxxxxxxx> -- 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
