diff --git a/ChangeLog b/ChangeLog
index 918fb5120..fe10578a6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+Sat Mar  3 16:23:13 2007  Akinori MUSHA  <knu@iDaemons.org>
+
+	* env.h (SCOPE_CLONE): Introduce a new scope flag to prevent a
+	  local_tbl region from getting freed many times; submitted by
+	  Chikanaga Tomoyuki <chikanag AT nippon-control-system.co.jp> in
+	  [ruby-dev:30460].
+
+	* eval.c (proc_invoke): Ditto.
+
+	* gc.c (obj_free): Ditto.
+
+	* parse.y (top_local_setup_gen): Ditto.
+
 Sat Mar  3 16:07:02 2007  Akinori MUSHA  <knu@iDaemons.org>
 
 	* object.c (rb_obj_ivar_set): RDoc updated according to a
diff --git a/env.h b/env.h
index 311113323..c50103f71 100644
--- a/env.h
+++ b/env.h
@@ -43,6 +43,7 @@ extern struct SCOPE {
 #define SCOPE_MALLOC  1
 #define SCOPE_NOSTACK 2
 #define SCOPE_DONT_RECYCLE 4
+#define SCOPE_CLONE   8
 
 extern int ruby_in_eval;
 
diff --git a/eval.c b/eval.c
index 598609e8c..64a43c5b5 100644
--- a/eval.c
+++ b/eval.c
@@ -8553,11 +8553,12 @@ proc_invoke(proc, args, self, klass)
     if (klass) _block.frame.last_class = klass;
     _block.frame.argc = RARRAY(tmp)->len;
     _block.frame.flags = ruby_frame->flags;
-    if (_block.frame.argc && (ruby_frame->flags & FRAME_DMETH)) {
+    if (_block.frame.argc && DMETHOD_P()) {
         NEWOBJ(scope, struct SCOPE);
         OBJSETUP(scope, tmp, T_SCOPE);
         scope->local_tbl = _block.scope->local_tbl;
         scope->local_vars = _block.scope->local_vars;
+        scope->flags |= SCOPE_CLONE;
         _block.scope = scope;
     }
     /* modify current frame */
diff --git a/gc.c b/gc.c
index e3b088efd..9ac3bfbf6 100644
--- a/gc.c
+++ b/gc.c
@@ -1253,7 +1253,7 @@ obj_free(obj)
 	if (RANY(obj)->as.scope.local_vars &&
             RANY(obj)->as.scope.flags != SCOPE_ALLOCA) {
 	    VALUE *vars = RANY(obj)->as.scope.local_vars-1;
-	    if (vars[0] == 0)
+           if (!(RANY(obj)->as.scope.flags & SCOPE_CLONE) && vars[0] == 0)
 		RUBY_CRITICAL(free(RANY(obj)->as.scope.local_tbl));
 	    if (RANY(obj)->as.scope.flags & SCOPE_MALLOC)
 		RUBY_CRITICAL(free(vars));
diff --git a/parse.y b/parse.y
index 9241220f5..c30e42315 100644
--- a/parse.y
+++ b/parse.y
@@ -5727,7 +5727,8 @@ top_local_setup()
 		rb_mem_clear(ruby_scope->local_vars+i, len-i);
 	    }
 	    if (ruby_scope->local_tbl && ruby_scope->local_vars[-1] == 0) {
-		xfree(ruby_scope->local_tbl);
+               if (!(ruby_scope->flags & SCOPE_CLONE))
+                   xfree(ruby_scope->local_tbl);
 	    }
 	    ruby_scope->local_tbl = local_tbl();
 	}