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-rw-r--r--kernel/cgroup.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a5f75ac4e793..3f46165829a4 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1780,8 +1780,11 @@ static void cgroup_kill_sb(struct super_block *sb)
* If @root doesn't have any mounts or children, start killing it.
* This prevents new mounts by disabling percpu_ref_tryget_live().
* cgroup_mount() may wait for @root's release.
+ *
+ * And don't kill the default root.
*/
- if (css_has_online_children(&root->cgrp.self))
+ if (css_has_online_children(&root->cgrp.self) ||
+ root == &cgrp_dfl_root)
cgroup_put(&root->cgrp);
else
percpu_ref_kill(&root->cgrp.self.refcnt);