Issue #8924: logging: Improved error handling for Unicode in exception text.

Lib/logging/__init__.py

@@ -445,7 +445,13 @@ class Formatter:
         if record.exc_text:
             if s[-1:] != "\n":
                 s = s + "\n"
-            s = s + record.exc_text
+            try:
+                s = s + record.exc_text
+            except UnicodeError:
+                # Sometimes filenames have non-ASCII chars, which can lead
+                # to errors when s is Unicode and record.exc_text is str
+                # See issue 8924
+                s = s + record.exc_text.decode(sys.getfilesystemencoding())
         return s
 
 #

Misc/NEWS

@@ -71,6 +71,8 @@ C-API
 Library
 -------
 
+- Issue #8924: logging: Improved error handling for Unicode in exception text.
+
 - Fix codecs.escape_encode to return the correct consumed size.
 
 - Issue #6470: Drop UNC prefix in FixTk.