diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c8b0e5005f02..1e6e3c1d97df 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -7269,6 +7269,14 @@ int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info)
 	mutex_lock(&uuid_mutex);
 	mutex_lock(&fs_info->chunk_mutex);
 
+	/*
+	 * It is possible for mount and umount to race in such a way that
+	 * we execute this code path, but open_fs_devices failed to clear
+	 * total_rw_bytes. We certainly want it cleared before reading the
+	 * device items, so clear it here.
+	 */
+	fs_info->fs_devices->total_rw_bytes = 0;
+
 	/*
 	 * Read all device items, and then all the chunk items. All
 	 * device items are found before any chunk item (their object id