diff --git a/ChangeLog b/ChangeLog
index c3c9627b1c..f74ef95126 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Tue Aug 15 17:30:59 2000  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* eval.c (frame_dup): should set flag FRAME_MALLOC after
+	  argv allocation.
+
+	* eval.c (blk_free): should not free argv if GC was called before
+	  frame_dup.
+
 Tue Aug 15 16:08:40 2000  WATANABE Hirofumi  <eban@os.rim.or.jp>
 
 	* configure.in: add ac_cv_func_times=yes for mingw32.
diff --git a/env.h b/env.h
index 586d66c32b..3669baa33e 100644
--- a/env.h
+++ b/env.h
@@ -25,10 +25,14 @@ extern struct FRAME {
     char *file;
     int line;
     int iter;
+    int flags;
 } *ruby_frame;
 
 void rb_gc_mark_frame _((struct FRAME *));
 
+#define FRAME_ALLOCA 0
+#define FRAME_MALLOC 1
+
 extern struct SCOPE {
     struct RBasic super;
     ID *local_tbl;
diff --git a/eval.c b/eval.c
index 7ff72995c2..42ca67efc7 100644
--- a/eval.c
+++ b/eval.c
@@ -505,6 +505,7 @@ static struct SCOPE *top_scope;
     _frame.cbase = ruby_frame->cbase;	\
     _frame.argc = 0;			\
     _frame.argv = 0;			\
+    _frame.flags = FRAME_ALLOCA;	\
     ruby_frame = &_frame;		\
 
 #define POP_FRAME()  			\
@@ -5682,7 +5683,7 @@ blk_free(data)
 
     frame = data->frame.prev;
     while (frame) {
-	if (frame->argc > 0)
+	if (frame->argc > 0 && (frame->flags & FRAME_MALLOC))
 	    free(frame->argv);
 	tmp = frame;
 	frame = frame->prev;
@@ -5728,6 +5729,7 @@ frame_dup(frame)
 	    argv = ALLOC_N(VALUE, frame->argc);
 	    MEMCPY(argv, frame->argv, VALUE, frame->argc);
 	    frame->argv = argv;
+	    frame->flags = FRAME_MALLOC;
 	}
 	frame->tmp = 0;		/* should not preserve tmp */
 	if (!frame->prev) break;
@@ -7781,7 +7783,7 @@ rb_thread_status(thread)
     rb_thread_t th = rb_thread_check(thread);
 
     if (rb_thread_dead(th)) {
-	if (NIL_P(th->errinfo) && (th->flags & THREAD_RAISED))
+	if (!NIL_P(th->errinfo) && (th->flags & THREAD_RAISED))
 	    return Qnil;
 	return Qfalse;
     }
diff --git a/lib/net/ftp.rb b/lib/net/ftp.rb
index a40b3532b1..a63acec1d8 100644
--- a/lib/net/ftp.rb
+++ b/lib/net/ftp.rb
@@ -216,6 +216,7 @@ module Net
 	  raise FTPReplyError, resp
 	end
 	conn = sock.accept
+	sock.close
       end
       return conn
     end