--- a/mercurial/hbisect.py	Tue Nov 12 16:23:52 2013 +0900
+++ b/mercurial/hbisect.py	Fri Nov 22 17:26:58 2013 -0600
@@ -63,7 +63,8 @@
         badrev, ancestors = buildancestors(state['good'], state['bad'])
     bad = changelog.node(badrev)
     if not ancestors: # now we're confused
-        if len(state['bad']) == 1 and len(state['good']) == 1:
+        if (len(state['bad']) == 1 and len(state['good']) == 1 and
+            state['bad'] != state['good']):
             raise util.Abort(_("starting revisions are not directly related"))
         raise util.Abort(_("inconsistent state, %s:%s is good and bad")
                          % (badrev, short(bad)))