diff --git a/mercurial/branchmap.py b/mercurial/branchmap.py
--- a/mercurial/branchmap.py
+++ b/mercurial/branchmap.py
@@ -67,8 +67,6 @@ def read(repo):
             partial.setdefault(label, []).append(node)
             if state == 'c':
                 partial._closednodes.add(node)
-    except KeyboardInterrupt:
-        raise
     except Exception as inst:
         if repo.ui.debugflag:
             msg = 'invalid branchheads cache'
diff --git a/mercurial/extensions.py b/mercurial/extensions.py
--- a/mercurial/extensions.py
+++ b/mercurial/extensions.py
@@ -171,8 +171,6 @@ def loadall(ui):
                 continue
         try:
             load(ui, name, path)
-        except KeyboardInterrupt:
-            raise
         except Exception as inst:
             inst = _forbytes(inst)
             if path: