2 files changed, 9 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog
index e79e3c16fc..750d624142 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Tue Jun  1 01:14:31 2010  Masaya Tarui  <tarui@ruby-lnag.org>
+
+	* io.c (pipe_open): add RB_GC_GUARD.
+	  This caused failure when test/ruby/test_argf.rb is executed with
+	  GC.stress = true in mswin32_90
+
 Mon May 31 23:44:22 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
 
 	* ext/tk/extconf.rb: use tclConfig.sh/tkConfig.sh when frameworks
diff --git a/io.c b/io.c
index b67bcaf9c6..b08561befa 100644
--- a/io.c
+++ b/io.c
@@ -5112,6 +5112,9 @@ pipe_open(struct rb_exec_arg *eargp, VALUE prog, const char *modestr, int fmode,
 	    break;
 	}
     }
+
+    RB_GC_GUARD(argbuf);
+
     if (eargp)
 	rb_run_exec_options(&sarg, NULL);
     if ((fmode & FMODE_READABLE) && (fmode & FMODE_WRITABLE)) {