gc.c: zombie is not alive

* gc.c (is_live_object): finalizer may not run because of lazy-sweep.
  [ruby-dev:47786] [Bug #9069]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43502 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 1 deletions

diff --git a/gc.c b/gc.c
index 93b15882d1..2f261b3037 100644
--- a/gc.c
+++ b/gc.c
@@ -2050,7 +2050,10 @@ is_dead_object(rb_objspace_t *objspace, VALUE ptr)
 static inline int
 is_live_object(rb_objspace_t *objspace, VALUE ptr)
 {
-    if (BUILTIN_TYPE(ptr) == 0) return FALSE;
+    switch (BUILTIN_TYPE(ptr)) {
+      case 0: case T_ZOMBIE:
+	return FALSE;
+    }
     if (RBASIC(ptr)->klass == 0) return FALSE;
     if (is_dead_object(objspace, ptr)) return FALSE;
     return TRUE;