Exceptions raised during renaming in rotating file handlers are now passed to handleError (except for SystemExit and KeyboardInterrupt, which are re-raised).
diff --git a/Lib/logging/handlers.py b/Lib/logging/handlers.py
index 9e1bec1..8e569a7 100644
--- a/Lib/logging/handlers.py
+++ b/Lib/logging/handlers.py
@@ -131,7 +131,7 @@
             except (KeyboardInterrupt, SystemExit):
                 raise
             except:
-                pass
+                self.handleError(record)
             #print "%s -> %s" % (self.baseFilename, dfn)
         if self.encoding:
             self.stream = codecs.open(self.baseFilename, 'w', self.encoding)
@@ -280,7 +280,7 @@
         except (KeyboardInterrupt, SystemExit):
             raise
         except:
-            pass
+            self.handleError(record)
         if self.backupCount > 0:
             # find the oldest log file and delete it
             s = glob.glob(self.baseFilename + ".20*")