diff -r a736ab681b78 -r d2e1dcd4490d mercurial/bundle2.py
--- a/mercurial/bundle2.py	Thu Oct 08 15:35:44 2020 -0700
+++ b/mercurial/bundle2.py	Thu Oct 08 13:37:31 2020 -0700
@@ -2089,7 +2089,7 @@
     except error.Abort as e:
         raise error.Abort(
             _(b'bundle at %s is corrupted:\n%s')
-            % (util.hidepassword(raw_url), bytes(e))
+            % (util.hidepassword(raw_url), e.message)
         )
     assert not inpart.read()