Merged revisions 76764 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r76764 | antoine.pitrou | 2009-12-12 20:18:27 +0100 (sam., 12 déc. 2009) | 12 lines

  Merged revisions 76763 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

  ........
    r76763 | antoine.pitrou | 2009-12-12 20:13:08 +0100 (sam., 12 déc. 2009) | 7 lines

    Issue #7466: segmentation fault when the garbage collector is called
    in the middle of populating a tuple.  Patch by Florent Xicluna.

    (note: no NEWS entry for trunk since the bug was introduced in 2.7/3.1)
  ........
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diff --git a/Objects/tupleobject.c b/Objects/tupleobject.c
index 290107a..884174d 100644
--- a/Objects/tupleobject.c
+++ b/Objects/tupleobject.c
@@ -850,7 +850,8 @@
 
 	/* XXX UNREF/NEWREF interface should be more symmetrical */
 	_Py_DEC_REFTOTAL;
-	_PyObject_GC_UNTRACK(v);
+	if (_PyObject_GC_IS_TRACKED(v))
+		_PyObject_GC_UNTRACK(v);
 	_Py_ForgetReference((PyObject *) v);
 	/* DECREF items deleted by shrinkage */
 	for (i = newsize; i < oldsize; i++) {