Hello, Dmitry.
Can you please see whether the following patch resolves the issue?
I'm a bit nervous about it ending up in circular dependency, but I
*think* it should be okay.
Thanks.
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 0125589..9c40421 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -1820,6 +1820,8 @@ static void cgroup_kill_sb(struct super_block *sb)
struct kernfs_root *kf_root = kernfs_root_from_sb(sb);
struct cgroup_root *root = cgroup_root_from_kf(kf_root);
+ mutex_lock(&cgroup_mutex);
+
/*
* If @root doesn't have any mounts or children, start killing it.
* This prevents new mounts by disabling percpu_ref_tryget_live().
@@ -1834,6 +1836,8 @@ static void cgroup_kill_sb(struct super_block *sb)
percpu_ref_kill(&root->cgrp.self.refcnt);
kernfs_kill_sb(sb);
+
+ mutex_unlock(&cgroup_mutex);
}
struct file_system_type cgroup_fs_type = {
