diff -up glibc-2.12-2-gc4ccff1/malloc/arena.c.orig glibc-2.12-2-gc4ccff1/malloc/arena.c
--- glibc-2.12-2-gc4ccff1/malloc/arena.c.orig	2015-10-09 23:55:19.638596777 +0800
+++ glibc-2.12-2-gc4ccff1/malloc/arena.c	2015-10-09 23:56:27.420659953 +0800
@@ -1148,8 +1148,27 @@ arena_thread_freeres (void)
   if (a != NULL)
     {
       (void)mutex_lock(&list_lock);
-      a->next_free = free_list;
-      free_list = a;
+      /* Do not make free_list a cyclic one element list.  */
+      if (a != free_list)
+	{
+	  if (free_list != NULL)
+	    {
+	      mstate b = free_list;
+	      /* Check if not already in free_list.  */
+	      while (b->next_free != NULL)
+		{
+		  /* "a" can be at most once in free_list.  */
+		  if (b->next_free == a)
+		    {
+		      b->next_free = a->next_free;
+		      break;
+		    }
+		  b = b->next_free;
+		}
+	    }
+	  a->next_free = free_list;
+	  free_list = a;
+	}
       (void)mutex_unlock(&list_lock);
     }
 }