--- a/mercurial/util.py	Fri Jan 16 04:26:40 2015 +0100
+++ b/mercurial/util.py	Fri Jan 16 04:26:40 2015 +0100
@@ -2871,7 +2871,7 @@
     '''
     if otherf:
         otherf.flush()
-    f.write('%s at:\n' % msg)
+    f.write('%s at:\n' % msg.rstrip())
     for line in getstackframes(skip + 1):
         f.write(line)
     f.flush()