diff --git a/combine-diff.c b/combine-diff.c
index 641bc92dbd..455bc19087 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -20,6 +20,8 @@
 #include "oid-array.h"
 #include "revision.h"
 
+#include "trace.h"
+
 static int compare_paths(const struct combine_diff_path *one,
 			  const struct diff_filespec *two)
 {
@@ -1595,8 +1597,16 @@ void diff_tree_combined(const struct object_id *oid,
 	}
 
 	/* find out number of surviving paths */
-	for (num_paths = 0, p = paths; p; p = p->next)
+	trace_printf("Wink diff_tree_combined: find number of surviving paths num_parent=%d\n", num_parent);
+	for (num_paths = 0, p = paths; p; p = p->next) {
+		trace_printf("Wink diff_tree_combined: num_paths=%d &p=%p mode=%0x, oid=%s path=%s\n", num_paths, p, p->mode, oid_to_hex(&p->oid), p->path);
+		for (i = 0; i < num_parent; i++) {
+			trace_printf("Wink diff_tree_combined:  &p->parent[%d]=%p status=%c mode=%x oid=%s path.buf=%p contents path.buf=%s\n",
+				 i, &p->parent[i], p->parent[i].status, p->parent[i].mode, oid_to_hex(&p->parent[i].oid), p->parent[i].path.buf, p->parent[i].path.buf);
+		}
 		num_paths++;
+	}
+	trace_printf("Wink diff_tree_combined: found %d surviving paths\n", num_paths);
 
 	/* order paths according to diffcore_order */
 	if (opt->orderfile && num_paths) {
wink@fwlaptop 25-01-03T18:43:18.695Z:~/prgs/forks/git (wink-segfault-with-minimal-changes)
```

I made those changes on the `next` branch of git/git repo as of yesterday, 1/2/25,
here are the the relavant logs:
```
wink@fwlaptop 25-01-03T18:43:18.695Z:~/prgs/forks/git (wink-segfault-with-minimal-changes)
$ git log -2 --oneline
edf34e3ab4 (HEAD -> wink-segfault-with-minimal-changes, origin/wink-segfault-with-minimal-changes) bug: SEGFAULT with minimal changes:
6c04ab211c (upstream/next, origin/next, next) Sync with 'master'
wink@fwlaptop 25-01-03T18:44:13.976Z:~/prgs/forks/git (wink-segfault-with-minimal-changes)
```

What did you expect to happen? (Expected behavior)

When I use `git diff-tree --cc` on a merge commit with changes I expect to see
my trace_printf statements print the `struct combined_diff_path` members and
also the output diff-tree -cc results with the "combined changes" as can be
seen below:
```
wink@fwlaptop 25-01-03T18:46:58.472Z:~/prgs/forks/git (wink-segfault-with-minimal-changes)
$ GIT_TRACE=1 ./git diff-tree --cc 6f8ae955bda8ad246cc1f5f7a15f1c3b1c04696a
10:47:04.259504 git.c:476               trace: built-in: git diff-tree --cc 6f8ae955bda8ad246cc1f5f7a15f1c3b1c04696a
6f8ae955bda8ad246cc1f5f7a15f1c3b1c04696a
10:47:04.278220 combine-diff.c:1600     Wink diff_tree_combined: find number of surviving paths num_parent=2
10:47:04.278245 combine-diff.c:1602     Wink diff_tree_combined: num_paths=0 &p=0x5dd590883f60 mode=81a4, oid=0f41b2fd4a6b679a1cfcaa9a584c382068146212 path=refs.c
10:47:04.278253 combine-diff.c:1604     Wink diff_tree_combined:  &p->parent[0]=0x5dd590883f98 status=M mode=81a4 oid=7dd5e9fa3323111f06303674b213ae24ed2d04b6 path.buf=(nil) contents path.buf=(null)
10:47:04.278260 combine-diff.c:1604     Wink diff_tree_combined:  &p->parent[1]=0x5dd590883fe0 status=M mode=81a4 oid=c55583986940d8ef1e1c839364c03cd92d4f7114 path.buf=(nil) contents path.buf=(null)
10:47:04.278265 combine-diff.c:1602     Wink diff_tree_combined: num_paths=1 &p=0x5dd59088b450 mode=81a4, oid=a0cdd99250e8286b55808b697b0a94afac5d8319 path=refs.h
10:47:04.278270 combine-diff.c:1604     Wink diff_tree_combined:  &p->parent[0]=0x5dd59088b488 status=M mode=81a4 oid=09be47afbee51e99f4ae49588cd65596ccfcb07e path.buf=(nil) contents path.buf=(null)
10:47:04.278274 combine-diff.c:1604     Wink diff_tree_combined:  &p->parent[1]=0x5dd59088b4d0 status=M mode=81a4 oid=b0dfc65ed2e59c4b66967840339f81e7746a96d3 path.buf=(nil) contents path.buf=(null)
10:47:04.278278 combine-diff.c:1602     Wink diff_tree_combined: num_paths=2 &p=0x5dd59088b530 mode=81a4, oid=5cfb8b7ca8678e171b8e8a7ad6daf1af74a81b59 path=refs/files-backend.c
10:47:04.278283 combine-diff.c:1604     Wink diff_tree_combined:  &p->parent[0]=0x5dd59088b568 status=M mode=81a4 oid=467fe347fa7e7d82ed7a2836e43ea749bb90ad7d path.buf=(nil) contents path.buf=(null)
10:47:04.278287 combine-diff.c:1604     Wink diff_tree_combined:  &p->parent[1]=0x5dd59088b5b0 status=M mode=81a4 oid=8953d1c6d37b13b0db701888b3db92fd87a68aaa path.buf=(nil) contents path.buf=(null)
10:47:04.278291 combine-diff.c:1602     Wink diff_tree_combined: num_paths=3 &p=0x5dd59088b620 mode=81a4, oid=16550862d3ebe3b357c52254088b143c7ba000d6 path=refs/refs-internal.h
10:47:04.278296 combine-diff.c:1604     Wink diff_tree_combined:  &p->parent[0]=0x5dd59088b658 status=M mode=81a4 oid=66e66e0fc1e812ebebd1d4b0119899c84bf1c0ae path.buf=(nil) contents path.buf=(null)
10:47:04.278300 combine-diff.c:1604     Wink diff_tree_combined:  &p->parent[1]=0x5dd59088b6a0 status=M mode=81a4 oid=79b287c5ec5c7d8f759869cf93cda405640186dc path.buf=(nil) contents path.buf=(null)
10:47:04.278305 combine-diff.c:1602     Wink diff_tree_combined: num_paths=4 &p=0x5dd59088b710 mode=81a4, oid=00d95a9a2f42ce74c5cb4a42175b0953287851a6 path=refs/reftable-backend.c
10:47:04.278309 combine-diff.c:1604     Wink diff_tree_combined:  &p->parent[0]=0x5dd59088b748 status=M mode=81a4 oid=8a2a5b847c3d86332e319da69bfb5c8a56a10e86 path.buf=(nil) contents path.buf=(null)
10:47:04.278314 combine-diff.c:1604     Wink diff_tree_combined:  &p->parent[1]=0x5dd59088b790 status=M mode=81a4 oid=bec5962debea7b62572d08f6fa8fd38ab4cd8af6 path.buf=(nil) contents path.buf=(null)
10:47:04.278318 combine-diff.c:1609     Wink diff_tree_combined: found 5 surviving paths
diff --cc refs/files-backend.c
index 467fe347fa,8953d1c6d3..5cfb8b7ca8
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@@ -2533,9 -2539,15 +2543,15 @@@ static int check_old_oid(struct ref_upd
  			    oid_to_hex(oid),
  			    oid_to_hex(&update->old_oid));
  
 -	return -1;
 +	return ret;
  }
  
+ struct files_transaction_backend_data {
+ 	struct ref_transaction *packed_transaction;
+ 	int packed_refs_locked;
+ 	struct strmap ref_locks;
+ };
+ 
  /*
   * Prepare for carrying out update:
   * - Lock the reference referred to by update.
wink@fwlaptop 25-01-03T18:47:04.295Z:~/prgs/forks/git (wink-segfault-with-minimal-changes)
```

The above works because it has a hack fix I introduced and thus it works. The hack is to always
use `find_paths_generic` rather than `find_paths_multitree`. To do this I added
`need_generic_pathscan = true;` on top of the above change to have it run properly:
```
wink@fwlaptop 25-01-03T18:47:04.295Z:~/prgs/forks/git (wink-segfault-with-minimal-changes)
$ git diff
diff --git a/combine-diff.c b/combine-diff.c
index 455bc19087..f03ff6f820 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -1563,7 +1563,7 @@ void diff_tree_combined(const struct object_id *oid,
                        (opt->pickaxe_opts &
                         (DIFF_PICKAXE_KINDS_MASK & ~DIFF_PICKAXE_KIND_OBJFIND)) ||
                        opt->filter;
-
+    need_generic_pathscan = true;
        if (need_generic_pathscan) {
                /*
                 * NOTE generic case also handles --stat, as it computes
