diff -r c026547454dd -r 22c42bfbe7ab mercurial/context.py
--- a/mercurial/context.py	Fri Jan 12 11:10:18 2018 +0000
+++ b/mercurial/context.py	Fri Jan 12 11:15:41 2018 +0000
@@ -442,7 +442,7 @@
         # If the changeset is obsolete, enrich the message with the reason
         # that made this changeset not visible
         if ctx.obsolete():
-            msg = obsutil._getfilteredreason(unfilteredrepo, changeid, ctx)
+            msg = obsutil._getfilteredreason(repo, changeid, ctx)
         else:
             msg = _("hidden revision '%s'") % changeid