mercurial/obsutil.py

--- a/mercurial/obsutil.py	Wed Dec 06 16:43:07 2017 -0500
+++ b/mercurial/obsutil.py	Fri Dec 08 01:23:34 2017 +0100
@@ -441,12 +441,12 @@
     public = phases.public
     addedmarkers = tr.changes.get('obsmarkers')
     addedrevs = tr.changes.get('revs')
-    seenrevs = set(addedrevs)
+    seenrevs = set()
     obsoleted = set()
     for mark in addedmarkers:
         node = mark[0]
         rev = torev(node)
-        if rev is None or rev in seenrevs:
+        if rev is None or rev in seenrevs or rev in addedrevs:
             continue
         seenrevs.add(rev)
         if phase(repo, rev) == public: