Prompt if request is made to remove a snapshot whose "Merge failed".
---
 WHATS_NEW               |    1 +
 lib/metadata/lv_manip.c |    9 ++++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

Index: lvm2/lib/metadata/lv_manip.c
===================================================================
--- lvm2.orig/lib/metadata/lv_manip.c
+++ lvm2/lib/metadata/lv_manip.c
@@ -3271,7 +3271,7 @@ int lv_remove_with_dependencies(struct c
 	if (lv_is_cow(lv)) {
 		/*
 		 * A merging snapshot cannot be removed directly unless
-		 * it has been invalidated.
+		 * it has been invalidated or failed merge removal is requested.
 		 */
 		if (lv_is_merging_cow(lv) && !level) {
 			if (lv_info(lv->vg->cmd, lv, 0, &info, 1, 0) &&
@@ -3283,6 +3283,13 @@ int lv_remove_with_dependencies(struct c
 						  lv->name);
 					return 0;
 				}
+				else if ((snap_percent == PERCENT_MERGE_FAILED) &&
+					 (force == PROMPT) &&
+					 yes_no_prompt("Removing snapshot \"%s\" that failed to merge may leave origin \"%s\" inconsistent. "
+						       "Proceed? [y/n]: ", lv->name, origin_from_cow(lv)->name) == 'n') {
+					log_error("Logical volume %s not removed.", lv->name);
+					return 0;
+				}
 			}
 		}
 	}
Index: lvm2/WHATS_NEW
===================================================================
--- lvm2.orig/WHATS_NEW
+++ lvm2/WHATS_NEW
@@ -1,5 +1,6 @@
 Version 2.02.89 - 
 ==================================
+  Prompt if request is made to remove a snapshot whose "Merge failed".
   Allow removal of an invalid snapshot that was to be merged on next activation.
   Don't allow a user to merge an invalid snapshot.
   Use m and M lv_attr to indicate that a snapshot merge failed in lvs.