diff -r b844d0d367e2 -r cde72a195f32 mercurial/dispatch.py
--- a/mercurial/dispatch.py	Sat Apr 15 13:04:55 2017 +0900
+++ b/mercurial/dispatch.py	Mon Apr 17 23:53:19 2017 +0900
@@ -165,6 +165,10 @@
     except KeyboardInterrupt:
         try:
             req.ui.warn(_("interrupted!\n"))
+        except error.SignalInterrupt:
+            # maybe pager would quit without consuming all the output, and
+            # SIGPIPE was raised. we cannot print anything in this case.
+            pass
         except IOError as inst:
             if inst.errno != errno.EPIPE:
                 raise