Index: ChangeLog
==================================================================
--- ChangeLog
+++ ChangeLog
@@ -1,5 +1,10 @@
+2011-08-16  Don Porter  <dgp@users.sourceforge.net>
+
+	* generic/tclCompile.c: [Bug 3392070] More complete prevention of
+	Tcl_Obj reference cycles when producing an intrep of ByteCode.
+
 2011-08-16  Donal K. Fellows  <dkf@users.sf.net>
 
 	* generic/tclListObj.c (TclLindexList, TclLsetFlat): Silence warnings
 	about (unreachable) cases of uninitialized variables.
 	* generic/tclCmdIL.c (SelectObjFromSublist): Improve the generation of

Index: generic/tclCompile.c
==================================================================
--- generic/tclCompile.c
+++ generic/tclCompile.c
@@ -2447,12 +2447,20 @@
 	    /*
 	     * Prevent circular reference where the bytecode intrep of
 	     * a value contains a literal which is that same value.
 	     * If this is allowed to happen, refcount decrements may not
 	     * reach zero, and memory may leak.  Bugs 467523, 3357771
+	     *
+	     * NOTE:  [Bugs 3392070, 3389764] We make a copy based completely
+	     * on the string value, and do not call Tcl_DuplicateObj() so we
+             * can be sure we do not have any lingering cycles hiding in
+	     * the intrep.
 	     */
-	    codePtr->objArrayPtr[i] = Tcl_DuplicateObj(objPtr);
+	    int numBytes;
+	    const char *bytes = Tcl_GetStringFromObj(objPtr, &numBytes);
+
+	    codePtr->objArrayPtr[i] = Tcl_NewStringObj(bytes, numBytes);
 	    Tcl_IncrRefCount(codePtr->objArrayPtr[i]);
 	    Tcl_DecrRefCount(objPtr);
 	} else {
 	    codePtr->objArrayPtr[i] = envPtr->literalArrayPtr[i].objPtr;
 	}