diff -r 3264d3ce53a0 -r 1b05ffce47bd mercurial/localrepo.py
--- a/mercurial/localrepo.py	Sat Dec 22 02:11:12 2012 +0100
+++ b/mercurial/localrepo.py	Mon Dec 24 02:22:04 2012 +0100
@@ -1438,8 +1438,6 @@
                       if self.changelog.hasnode(node))
             cache = self._branchcache
             branchmap.update(self, cache, ctxgen)
-            cache.tipnode = self.changelog.tip()
-            cache.tiprev = self.changelog.rev(cache.tipnode)
             cache.write(self)
 
         # Ensure the persistent tag cache is updated.  Doing it now