See https://bugzilla.redhat.com/show_bug.cgi?id=1435567 for an example
where the message occurs,

Signed-off-by: Christophe de Dinechin <dinec...@redhat.com>
---
 cmds-check.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/cmds-check.c b/cmds-check.c
index 17b7efb..2d3ebc1 100644
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -6832,14 +6832,14 @@ static int process_extent_item(struct btrfs_root *root,
                        ret = add_tree_backref(extent_cache, key.objectid,
                                        0, offset, 0);
                        if (ret < 0)
-                               error("add_tree_backref failed: %s",
+                               error("add_tree_backref failed (extent items 
tree block): %s",
                                      strerror(-ret));
                        break;
                case BTRFS_SHARED_BLOCK_REF_KEY:
                        ret = add_tree_backref(extent_cache, key.objectid,
                                        offset, 0, 0);
                        if (ret < 0)
-                               error("add_tree_backref failed: %s",
+                               error("add_tree_backref failed (extent items 
shared block): %s",
                                      strerror(-ret));
                        break;
                case BTRFS_EXTENT_DATA_REF_KEY:
@@ -7753,7 +7753,7 @@ static int run_next_block(struct btrfs_root *root,
                                ret = add_tree_backref(extent_cache,
                                                key.objectid, 0, key.offset, 0);
                                if (ret < 0)
-                                       error("add_tree_backref failed: %s",
+                                       error("add_tree_backref failed (leaf 
tree block): %s",
                                              strerror(-ret));
                                continue;
                        }
@@ -7761,7 +7761,7 @@ static int run_next_block(struct btrfs_root *root,
                                ret = add_tree_backref(extent_cache,
                                                key.objectid, key.offset, 0, 0);
                                if (ret < 0)
-                                       error("add_tree_backref failed: %s",
+                                       error("add_tree_backref failed (leaf 
shared block): %s",
                                              strerror(-ret));
                                continue;
                        }
@@ -7866,7 +7866,7 @@ static int run_next_block(struct btrfs_root *root,
                        ret = add_tree_backref(extent_cache, ptr, parent,
                                        owner, 1);
                        if (ret < 0) {
-                               error("add_tree_backref failed: %s",
+                               error("add_tree_backref failed (non-leaf 
block): %s",
                                      strerror(-ret));
                                continue;
                        }
-- 
2.9.3

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