diff --git a/swh/scheduler/celery_backend/config.py b/swh/scheduler/celery_backend/config.py
--- a/swh/scheduler/celery_backend/config.py
+++ b/swh/scheduler/celery_backend/config.py
@@ -3,9 +3,12 @@
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
+import functools
 import logging
 import os
 import pkg_resources
+import traceback
+from typing import Any, Dict
 import urllib.parse
 
 from celery import Celery
@@ -18,8 +21,6 @@
 
 import requests
 
-from typing import Any, Dict
-
 from swh.scheduler import CONFIG as SWH_CONFIG
 
 from swh.core.config import load_named_config, merge_configs
@@ -44,7 +45,27 @@
 logger = logging.getLogger(__name__)
 
 
+# Celery eats tracebacks in signal callbacks, this decorator catches
+# and prints them.
+# Also tries to notify Sentry if possible.
+def _print_errors(f):
+    @functools.wraps(f)
+    def newf(*args, **kwargs):
+        try:
+            return f(*args, **kwargs)
+        except Exception as exc:
+            traceback.print_exc()
+            try:
+                import sentry_sdk
+                sentry_sdk.capture_exception(exc)
+            except Exception:
+                traceback.print_exc()
+
+    return newf
+
+
 @setup_logging.connect
+@_print_errors
 def setup_log_handler(loglevel=None, logfile=None, format=None, colorize=None,
                       log_console=None, log_journal=None, **kwargs):
     """Setup logging according to Software Heritage preferences.
@@ -105,6 +126,7 @@
 
 
 @celeryd_after_setup.connect
+@_print_errors
 def setup_queues_and_tasks(sender, instance, **kwargs):
     """Signal called on worker start.