The trace module was trying to turn ints into ints since co_lnotab was changed
to a bytes object.
diff --git a/Lib/trace.py b/Lib/trace.py
index a5c2f11..a272683 100644
--- a/Lib/trace.py
+++ b/Lib/trace.py
@@ -367,7 +367,7 @@
     """Return dict where keys are lines in the line number table."""
     linenos = {}
 
-    line_increments = [ord(c) for c in code.co_lnotab[1::2]]
+    line_increments = code.co_lnotab[1::2]
     table_length = len(line_increments)
     docstring = False
 
diff --git a/Misc/NEWS b/Misc/NEWS
index c2b4ed8..95468b4 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -147,6 +147,9 @@
 Library
 -------
 
+- Fix a bug in the trace module where a bytes object from co_lnotab had its
+  items being passed through ord().
+
 - Issue #2047: shutil.move() could believe that its destination path was
   inside its source path if it began with the same letters (e.g. "src" vs.
   "src.new").