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diff --git a/ChangeLog b/ChangeLog
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+Thu Apr 11 03:33:05 2013  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* ext/fiddle/closure.c (initialize): check mprotect's return value.
+	  If mprotect is failed because of PaX or something, its function call
+	  will cause SEGV.
+	  http://c5664.rubyci.org/~chkbuild/ruby-trunk/log/20130401T210301Z.diff.html.gz
+
 Wed Apr 10 17:39:13 2013  Tanaka Akira  <akr@fsij.org>
 
 	* ext/bigdecimal/bigdecimal.c (VpCtoV): Initialize a local variable