--- a/mercurial/configitems.py	Sat May 26 03:01:14 2018 +0530
+++ b/mercurial/configitems.py	Wed Jun 06 13:31:24 2018 -0400
@@ -1128,6 +1128,9 @@
 coreconfigitem('ui', 'rollback',
     default=True,
 )
+coreconfigitem('ui', 'signal-safe-lock',
+    default=True,
+)
 coreconfigitem('ui', 'slash',
     default=False,
 )