--- a/mercurial/localrepo.py	Mon May 11 16:44:11 2020 +0200
+++ b/mercurial/localrepo.py	Mon May 11 13:08:02 2020 +0200
@@ -1450,6 +1450,8 @@
 
     @storecache(b'00changelog.i')
     def changelog(self):
+        # load dirstate before changelog to avoid race see issue6303
+        self.dirstate.prefetch_parents()
         return self.store.changelog(txnutil.mayhavepending(self.root))
 
     @storecache(b'00manifest.i')