Index: Lib/logging/__init__.py
===================================================================
--- Lib/logging/__init__.py	(revision 58033)
+++ Lib/logging/__init__.py	(working copy)
@@ -247,7 +247,6 @@
             self.filename = pathname
             self.module = "Unknown module"
         self.exc_info = exc_info
-        self.exc_text = None      # used to cache the traceback text
         self.lineno = lineno
         self.funcName = func
         self.created = ct
@@ -420,14 +419,10 @@
             record.asctime = self.formatTime(record, self.datefmt)
         s = self._fmt % record.__dict__
         if record.exc_info:
-            # Cache the traceback text to avoid converting it multiple times
-            # (it's constant anyway)
-            if not record.exc_text:
-                record.exc_text = self.formatException(record.exc_info)
-        if record.exc_text:
+            exc_text = self.formatException(record.exc_info)
             if s[-1:] != "\n":
                 s = s + "\n"
-            s = s + record.exc_text
+            s = s + exc_text
         return s
 
 #