diff -r a9221c7f51a4 -r 21233de9c053 mercurial/hbisect.py
--- a/mercurial/hbisect.py	Wed Dec 31 15:04:18 2008 +0100
+++ b/mercurial/hbisect.py	Sat Dec 27 19:05:26 2008 +0100
@@ -102,7 +102,7 @@
             if value == perfect: # found a perfect candidate? quit early
                 break
 
-        if y < perfect: # all downhill from here?
+        if y < perfect and rev not in skip: # all downhill from here?
             for c in children.get(rev, []):
                 poison[c] = True # poison children
             continue