--- a/mercurial/localrepo.py	Fri Jun 30 03:44:04 2017 +0200
+++ b/mercurial/localrepo.py	Tue Jun 27 02:45:09 2017 +0200
@@ -1083,6 +1083,7 @@
                                      validator=validate,
                                      releasefn=releasefn)
         tr.changes['revs'] = set()
+        tr.changes['obsmarkers'] = set()
 
         tr.hookargs['txnid'] = txnid
         # note: writing the fncache only during finalize mean that the file is