diff -rup a/stdlib/qsort.c b/stdlib/qsort.c
--- a/stdlib/qsort.c	2023-07-31 10:54:16.000000000 -0700
+++ b/stdlib/qsort.c	2024-01-15 09:08:25.596167959 -0800
@@ -224,7 +224,8 @@ _quicksort (void *const pbase, size_t to
     while ((run_ptr += size) <= end_ptr)
       {
 	tmp_ptr = run_ptr - size;
-	while ((*cmp) ((void *) run_ptr, (void *) tmp_ptr, arg) < 0)
+	while (tmp_ptr != base_ptr
+	       && (*cmp) ((void *) run_ptr, (void *) tmp_ptr, arg) < 0)
 	  tmp_ptr -= size;
 
 	tmp_ptr += size;