diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 2fbdff6..19aebd3 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -280,6 +280,11 @@ void release_sysfs_dirent(struct sysfs_dirent * sd)
 	 * sd->s_parent won't change beneath us.
 	 */
 	parent_sd = sd->s_parent;
+	if(!(sd->s_flags & SYSFS_FLAG_REMOVED)) {
+		printk("%s-%d sysfs_dirent use after free: %s-%s\n",
+			__func__, __LINE__, parent_sd->s_name, sd->s_name);
+		dump_stack();
+	}
 
 	if (sysfs_type(sd) == SYSFS_KOBJ_LINK)
 		sysfs_put(sd->s_symlink.target_sd);
@@ -962,6 +967,12 @@ static struct sysfs_dirent *sysfs_dir_pos(const void *ns,
 		int valid = !(pos->s_flags & SYSFS_FLAG_REMOVED) &&
 			pos->s_parent == parent_sd &&
 			hash == pos->s_hash;
+
+		if ((atomic_read(&pos->s_count) == 1)) {
+			printk("%s-%d sysfs_dirent use after free: %s(%s)-%s, %lld-%u\n",
+				__func__, __LINE__, parent_sd->s_name, pos->s_parent->s_name,
+				pos->s_name, hash, pos->s_hash);
+		}
 		sysfs_put(pos);
 		if (!valid)
 			pos = NULL;
@@ -1058,10 +1069,21 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
 	return 0;
 }
 
+static loff_t sysfs_dir_llseek(struct file *file, loff_t offset, int whence)
+{
+		struct inode *inode = file_inode(file);
+		loff_t ret;
+
+		mutex_lock(&inode->i_mutex);
+		ret = generic_file_llseek(file, offset, whence);
+		mutex_unlock(&inode->i_mutex);
+
+		return ret;
+}
 
 const struct file_operations sysfs_dir_operations = {
 	.read		= generic_read_dir,
 	.readdir	= sysfs_readdir,
 	.release	= sysfs_dir_release,
-	.llseek		= generic_file_llseek,
+	.llseek		= sysfs_dir_llseek,
 };