commit fe38a8e2292a3da2aa9d3e3860b54a3eaad2ec33
Author: Serge Hallyn <serge.hallyn@ubuntu.com>
Date:   Fri Jul 25 19:40:21 2014 -0500

    don't issue a scary warning about premounted cgroups, use debug
    
    Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

diff --git a/fs.c b/fs.c
index d9cfde7..2b39dd8 100644
--- a/fs.c
+++ b/fs.c
@@ -356,7 +356,7 @@ static bool do_mount_subsys(int i)
 		ret = mount(src, dest, "cgroup", 0, src);
 	if (ret < 0) {
 		if (!m->premounted) {
-			nih_warn("Failed mounting %s onto %s: %s", src, dest, strerror(errno));
+			nih_debug("Failed mounting %s onto %s: %s", src, dest, strerror(errno));
 			free(m->path);
 			m->path = NULL;
 			return true;
