Issue #5971: StreamHandler.handleError now swallows IOErrors which occur when trying to print a traceback.

Lib/logging/__init__.py

@@ -720,7 +720,11 @@ class Handler(Filterer):
         """
         if raiseExceptions:
             ei = sys.exc_info()
+            try:
                 traceback.print_exception(ei[0], ei[1], ei[2], None, sys.stderr)
+            except IOError:
+                pass    # see issue 5971
+            finally:
                 del ei
 
 class StreamHandler(Handler):

Misc/NEWS

@@ -285,6 +285,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #5971: StreamHandler.handleError now swallows IOErrors which occur when
+  trying to print a traceback.
+
 - Issue #5976: Fixed Distutils test_check_environ.
 
 - Issue #5900: Ensure RUNPATH is added to extension modules with RPATH if GNU