Re: BUG: Segfault on "git pull" on "bad object HEAD"

So I feel like the right answer here is probably this:

diff --git a/wt-status.c b/wt-status.c
index d1c05145a4..5fcaa3d0f8 100644
--- a/wt-status.c
+++ b/wt-status.c

@@ -2340,7 +2340,16 @@ int has_uncommitted_changes(int ignore_submodules)
 	if (ignore_submodules)
 		rev_info.diffopt.flags.ignore_submodules = 1;
 	rev_info.diffopt.flags.quick = 1;
+
 	add_head_to_pending(&rev_info);
+	if (!rev_info.pending.nr) {
+		/*
+		 * We have no head (or it's corrupt), but the index is not
+		 * unborn; declare it as uncommitted changes.
+		 */
+		return 1;
+	}
+
 	diff_setup_done(&rev_info.diffopt);
 	result = run_diff_index(&rev_info, 1);
 	return diff_result_code(&rev_info.diffopt, result);

That does quietly paper over the corruption, but it does the
conservative thing, and a follow-up "git status" would yield "bad
object: HEAD".