diff --git a/colcon_core/executor/sequential.py b/colcon_core/executor/sequential.py
index 8f078b63..b3bc3cab 100644
--- a/colcon_core/executor/sequential.py
+++ b/colcon_core/executor/sequential.py
@@ -5,7 +5,6 @@
 import logging
 import signal
 import sys
-import traceback
 
 from colcon_core.executor import ExecutorExtensionPoint
 from colcon_core.executor import OnError
@@ -68,10 +67,9 @@ def execute(self, args, jobs, *, on_error=OnError.interrupt):  # noqa: D102
                         "run_until_complete '{name}' finished"
                         .format_map(locals()))
                     return signal.SIGINT
-                except Exception as e:  # noqa: F841
-                    exc = traceback.format_exc()
-                    logger.error(
-                        "Exception in job execution '{name}': {e}\n{exc}"
+                except Exception:
+                    logger.exception(
+                        "Exception in job execution '{name}'"
                         .format_map(locals()))
                     return 1
                 result = future.result()
diff --git a/colcon_core/plugin_system.py b/colcon_core/plugin_system.py
index 5dfa8a17..a2817d2f 100644
--- a/colcon_core/plugin_system.py
+++ b/colcon_core/plugin_system.py
@@ -2,7 +2,6 @@
 # Licensed under the Apache License, Version 2.0
 
 from collections import OrderedDict
-import traceback
 
 from colcon_core.entry_point import load_entry_points
 from colcon_core.logging import colcon_logger
@@ -65,12 +64,11 @@ def _instantiate_extension(
             "Skipping extension '{group_name}.{extension_name}': {e}"
             .format_map(locals()))
         extension_instance = None
-    except Exception as e:  # noqa: F841
+    except Exception:
         # catch exceptions raised in extension constructor
-        exc = traceback.format_exc()
-        logger.error(
+        logger.exception(
             'Exception instantiating extension '
-            "'{group_name}.{extension_name}': {e}\n{exc}".format_map(locals()))
+            "'{group_name}.{extension_name}'".format_map(locals()))
         extension_instance = None
     if not unique_instance:
         _extension_instances[extension_class] = extension_instance
diff --git a/colcon_core/task/python/test/__init__.py b/colcon_core/task/python/test/__init__.py
index d61e529a..050f2551 100644
--- a/colcon_core/task/python/test/__init__.py
+++ b/colcon_core/task/python/test/__init__.py
@@ -2,7 +2,6 @@
 # Licensed under the Apache License, Version 2.0
 
 import re
-import traceback
 
 from colcon_core.logging import colcon_logger
 from colcon_core.plugin_system import get_first_line_doc
@@ -27,7 +26,6 @@ def add_arguments(self, *, parser):  # noqa: D102
         add_python_testing_step_arguments(parser)
 
     async def test(self, *, additional_hooks=None):  # noqa: D102
-        pkg = self.context.pkg
         args = self.context.args
 
         logger.info(
@@ -36,8 +34,8 @@ async def test(self, *, additional_hooks=None):  # noqa: D102
         try:
             env = await get_command_environment(
                 'setup_py', args.build_base, self.context.dependencies)
-        except RuntimeError as e:
-            logger.error(str(e))
+        except RuntimeError:
+            logger.exception('Failed to get command environment')
             return 1
         setup_py_data = get_setup_data(self.context.pkg, env)
 
@@ -52,15 +50,13 @@ async def test(self, *, additional_hooks=None):  # noqa: D102
                     1, "test() by extension '{key}'".format_map(locals()))
                 try:
                     matched = extension.match(self.context, env, setup_py_data)
-                except Exception as e:  # noqa: F841
+                except Exception:
                     # catch exceptions raised in python testing step extension
-                    exc = traceback.format_exc()
-                    logger.error(
+                    logger.exception(
                         'Exception in Python testing step extension '
-                        "'{extension.STEP_TYPE}': {e}\n{exc}"
+                        "'{extension.STEP_TYPE}'"
                         .format_map(locals()))
-                    # skip failing extension, continue with next one
-                    continue
+                    return 1
                 if matched:
                     break
             else:
@@ -73,12 +69,11 @@ async def test(self, *, additional_hooks=None):  # noqa: D102
             1, "test.step() by extension '{key}'".format_map(locals()))
         try:
             return await extension.step(self.context, env, setup_py_data)
-        except Exception as e:  # noqa: F841
+        except Exception:
             # catch exceptions raised in python testing step extension
-            exc = traceback.format_exc()
-            logger.error(
+            logger.exception(
                 'Exception in Python testing step extension '
-                "'{extension.STEP_TYPE}': {e}\n{exc}".format_map(locals()))
+                "'{extension.STEP_TYPE}'".format_map(locals()))
             return 1
 
 
@@ -176,12 +171,11 @@ def add_python_testing_step_arguments(parser):
         try:
             retval = extension.add_arguments(parser=parser)
             assert retval is None, 'add_arguments() should return None'
-        except Exception as e:  # noqa: F841
+        except Exception:
             # catch exceptions raised in package selection extension
-            exc = traceback.format_exc()
-            logger.error(
+            logger.exception(
                 'Exception in Python testing step extension '
-                "'{extension.STEP_TYPE}': {e}\n{exc}".format_map(locals()))
+                "'{extension.STEP_TYPE}'".format_map(locals()))
             # skip failing extension, continue with next one