* gc.c (gc_before_heap_sweep): fix freelist management.

After rb_gc_force_recycle() for a object blonging to heap->freelist,
  `heap->using_page->freelist' is not null.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43421 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Sat Oct 26 04:01:35 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c (gc_before_heap_sweep): fix freelist management.
+	  After rb_gc_force_recycle() for a object blonging to heap->freelist,
+	  `heap->using_page->freelist' is not null.
+
 Thu Oct 24 21:57:24 2013  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
 
 	* parse.y: Remove +(binary) and -(binary) special cases

gc.c

@@ -2483,7 +2483,18 @@ gc_before_heap_sweep(rb_objspace_t *objspace, rb_heap_t *heap)
     heap->free_pages = NULL;
 
     if (heap->using_page) {
-	heap->using_page->freelist = heap->freelist;
+	if (heap->using_page->freelist) {
+	    RVALUE *pstart = heap->using_page->freelist;
+	    RVALUE *p = heap->using_page->freelist;
+	    while (p->as.free.next) {
+		p = p->as.free.next;
+	    }
+	    p->as.free.next = heap->freelist;
+	    heap->using_page->freelist = pstart;
+	}
+	else {
+	    heap->using_page->freelist = heap->freelist;
+	}
 	heap->using_page = NULL;
     }
     heap->freelist = NULL;