Fixed #32261 -- Added error logging to Signal.send_robust().

django/dispatch/dispatcher.py

@@ -1,3 +1,4 @@
+import logging
 import threading
 import warnings
 import weakref
@@ -5,6 +6,8 @@ import weakref
 from django.utils.deprecation import RemovedInDjango40Warning
 from django.utils.inspect import func_accepts_kwargs
 
+logger = logging.getLogger('django.dispatch')
+
 
 def _make_id(target):
     if hasattr(target, '__func__'):
@@ -208,6 +211,12 @@ class Signal:
             try:
                 response = receiver(signal=self, sender=sender, **named)
             except Exception as err:
+                logger.error(
+                    'Error calling %s in Signal.send_robust() (%s)',
+                    receiver.__qualname__,
+                    err,
+                    exc_info=err,
+                )
                 responses.append((receiver, err))
             else:
                 responses.append((receiver, response))