---

yaml
---
r: 274719
b: refs/heads/master
c: 7c7e82a
h: refs/heads/master
i:
  274717: 9f4cf2a
  274715: fd8b7c4
  274711: cb5a19d
  274703: 14842a4
  274687: aec2d0b
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d43317dcd074818d4bd12ddd4184a29aff98907b
+refs/heads/master: 7c7e82a77fe3d89ae50824aa7c897454675eb4c4

trunk/fs/btrfs/disk-io.c

@@ -1754,11 +1754,18 @@ static void backup_super_roots(struct btrfs_fs_info *info)
 	btrfs_set_backup_extent_root_level(root_backup,
 			       btrfs_header_level(info->extent_root->node));
 
-	btrfs_set_backup_fs_root(root_backup, info->fs_root->node->start);
-	btrfs_set_backup_fs_root_gen(root_backup,
+	/*
+	 * we might commit during log recovery, which happens before we set
+	 * the fs_root.  Make sure it is valid before we fill it in.
+	 */
+	if (info->fs_root && info->fs_root->node) {
+		btrfs_set_backup_fs_root(root_backup,
+					 info->fs_root->node->start);
+		btrfs_set_backup_fs_root_gen(root_backup,
 			       btrfs_header_generation(info->fs_root->node));
-	btrfs_set_backup_fs_root_level(root_backup,
+		btrfs_set_backup_fs_root_level(root_backup,
 			       btrfs_header_level(info->fs_root->node));
+	}
 
 	btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start);
 	btrfs_set_backup_dev_root_gen(root_backup,