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Add trigger_exception_handler() for post-mortem debugging of caught exceptions#1996

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Add trigger_exception_handler() for post-mortem debugging of caught exceptions#1996
nshepperd wants to merge 10 commits into
microsoft:mainfrom
nshepperd:easy-postmortem

Suppress ruff on test_trigger_exception_handler_preserves_frame_local

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Azure Pipelines / debugpy-test failed Jul 17, 2026 in 36m 1s

Build #20260717.5 had test failures

Details

Tests

  • Failed: 3 (0.01%)
  • Passed: 17,283 (81.54%)
  • Other: 3,910 (18.45%)
  • Total: 21,196

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Check failure on line 2610 in Build log

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@azure-pipelines azure-pipelines / debugpy-test

Build log #L2610

PowerShell exited with code '1'.

Check failure on line 3100 in Build log

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@azure-pipelines azure-pipelines / debugpy-test

Build log #L3100

PowerShell exited with code '1'.

Check failure on line 2928 in Build log

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@azure-pipelines azure-pipelines / debugpy-test

Build log #L2928

PowerShell exited with code '1'.

Check failure on line 1 in test_attach_pid_client[program-int]

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@azure-pipelines azure-pipelines / debugpy-test

test_attach_pid_client[program-int]

failed on teardown with "KeyError: <_pytest.stash.StashKey object at 0x7fc1ff4428e0>"
Raw output
cls = <class '_pytest.runner.CallInfo'>
func = <function call_and_report.<locals>.<lambda> at 0x7fc1fd896820>
when = 'teardown'
reraise = (<class '_pytest.outcomes.Exit'>, <class 'KeyboardInterrupt'>)

    @classmethod
    def from_call(
        cls,
        func: Callable[[], TResult],
        when: Literal["collect", "setup", "call", "teardown"],
        reraise: type[BaseException] | tuple[type[BaseException], ...] | None = None,
    ) -> CallInfo[TResult]:
        """Call func, wrapping the result in a CallInfo.
    
        :param func:
            The function to call. Called without arguments.
        :type func: Callable[[], _pytest.runner.TResult]
        :param when:
            The phase in which the function is called.
        :param reraise:
            Exception or exceptions that shall propagate if raised by the
            function, instead of being wrapped in the CallInfo.
        """
        excinfo = None
        instant = timing.Instant()
        try:
>           result: TResult | None = func()
                                     ^^^^^^

.tox/py314/lib/python3.14/site-packages/_pytest/runner.py:361: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
.tox/py314/lib/python3.14/site-packages/_pytest/runner.py:250: in <lambda>
    lambda: runtest_hook(item=item, **kwds),
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/py314/lib/python3.14/site-packages/pluggy/_hooks.py:512: in __call__
    return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/py314/lib/python3.14/site-packages/pluggy/_manager.py:120: in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/py314/lib/python3.14/site-packages/_pytest/logging.py:873: in pytest_runtest_teardown
    yield
.tox/py314/lib/python3.14/site-packages/_pytest/capture.py:905: in pytest_runtest_teardown
    return (yield)
            ^^^^^
.tox/py314/lib/python3.14/site-packages/_pytest/runner.py:199: in pytest_runtest_teardown
    item.session._setupstate.teardown_exact(nextitem)
.tox/py314/lib/python3.14/site-packages/_pytest/runner.py:579: in teardown_exact
    raise exceptions[0]
.tox/py314/lib/python3.14/site-packages/_pytest/runner.py:568: in teardown_exact
    fin()
.tox/py314/lib/python3.14/site-packages/_pytest/fixtures.py:1166: in finish
    raise exceptions[0]
.tox/py314/lib/python3.14/site-packages/_pytest/fixtures.py:1156: in finish
    fin()
.tox/py314/lib/python3.14/site-packages/_pytest/fixtures.py:1014: in _teardown_yield_fixture
    next(it)
.tox/py314/lib/python3.14/site-packages/_pytest/tmpdir.py:305: in tmp_path
    result_dict = request.node.stash[tmppath_result_key]
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <_pytest.stash.Stash object at 0x7fc1fdbce920>
key = <_pytest.stash.StashKey object at 0x7fc1ff4428e0>

    def __getitem__(self, key: StashKey[T]) -> T:
        """Get the value for key.
    
        Raises ``KeyError`` if the key wasn't set before.
        """
>       return cast(T, self._storage[key])
                       ^^^^^^^^^^^^^^^^^^
E       KeyError: <_pytest.stash.StashKey object at 0x7fc1ff4428e0>

.tox/py314/lib/python3.14/site-packages/_pytest/stash.py:84: KeyError

Check failure on line 1 in test_break_on_system_exit_empty[1-launch(console=integratedTerminal)-program]

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@azure-pipelines azure-pipelines / debugpy-test

test_break_on_system_exit_empty[1-launch(console=integratedTerminal)-program]

AssertionError: assert -1 == 2147942406
 +  where -1 = psutil.Popen(pid=6288, status='terminated', exitcode=-1, started='22:58:54').returncode
 +    where psutil.Popen(pid=6288, status='terminated', exitcode=-1, started='22:58:54') = <tests.debug.session.Session object at 0x00000122E9746930>.debuggee
 +  and   2147942406 = <tests.debug.session.Session object at 0x00000122E9746930>.exit_code
Raw output
pyfile = <function pyfile.<locals>.factory at 0x00000122E9839C60>
target = <class 'tests.debug.targets.Program'>
run = launch(console=integratedTerminal), exit_code = 1

    @pytest.mark.parametrize("target", targets.all_named)
    @pytest.mark.parametrize("run", runners.all)
    @pytest.mark.parametrize("exit_code", [0, 1, 3])
    def test_break_on_system_exit_empty(pyfile, target, run, exit_code):
        @pyfile
        def code_to_debug():
            import debuggee
            import sys
    
            debuggee.setup()
            exit_code = eval(sys.argv[1])
            print("sys.exit(%r)" % (exit_code,))
            sys.exit(exit_code)
    
>       with debug.Session() as session:
             ^^^^^^^^^^^^^^^

tests\debugpy\test_exception.py:350: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests\debug\session.py:255: in __exit__
    self.wait_for_exit()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <tests.debug.session.Session object at 0x00000122E9746930>

    def wait_for_exit(self):
        if self.debuggee is not None:
            log.info("Waiting for {0} to exit ...", self.debuggee_id)
            try:
                self.debuggee.wait()
            except Exception:
                pass
            finally:
                watchdog.unregister_spawn(self.debuggee.pid, self.debuggee_id)
    
        self.wait_for_terminated()
    
        # FIXME: "exited" event is not properly reported in attach scenarios at the
        # moment, so the exit code is only checked if it's present.
        if self.debuggee is not None and self.exit_code is not None:
>           assert self.debuggee.returncode == self.exit_code
E           AssertionError: assert -1 == 2147942406
E            +  where -1 = psutil.Popen(pid=6288, status='terminated', exitcode=-1, started='22:58:54').returncode
E            +    where psutil.Popen(pid=6288, status='terminated', exitcode=-1, started='22:58:54') = <tests.debug.session.Session object at 0x00000122E9746930>.debuggee
E            +  and   2147942406 = <tests.debug.session.Session object at 0x00000122E9746930>.exit_code

tests\debug\session.py:990: AssertionError

Check failure on line 1 in test_thread_count[program-launch-3]

See this annotation in the file changed.

@azure-pipelines azure-pipelines / debugpy-test

test_thread_count[program-launch-3]

assert 4 == 3
 +  where 4 = len([{\n    "id": 1,\n    "name": "MainThread"\n}, {\n    "id": 2,\n    "name": "Dummy-6"\n}, {\n    "id": 3,\n    "name": "Thread-7 (worker)"\n}, {\n    "id": 4,\n    "name": "Thread-8 (worker)"\n}])
Raw output
pyfile = <function pyfile.<locals>.factory at 0x00000235FAC73C70>
target = <class 'tests.debug.targets.Program'>, run = launch, count = 3

    @pytest.mark.parametrize("count", [1, 3])
    def test_thread_count(pyfile, target, run, count):
        @pyfile
        def code_to_debug():
            import debuggee
            import threading
            import time
            import sys
    
            debuggee.setup()
            stop = False # noqa: F841
    
            def worker(tid, offset):
                i = 0
                global stop
                while not stop:
                    time.sleep(0.01)
                    i += 1
    
            threads = []
            if sys.argv[1] != "1":
                for i in [111, 222]:
                    thread = threading.Thread(target=worker, args=(i, len(threads)))
                    threads.append(thread)
                    thread.start()
            print("check here")  # @bp
            stop = True  # noqa: F841
    
        with debug.Session() as session:
            with run(session, target(code_to_debug, args=[str(count)])):
                session.set_breakpoints(code_to_debug, all)
    
            session.wait_for_stop()
            threads = session.request("threads")
>           assert len(threads["threads"]) == count
E           assert 4 == 3
E            +  where 4 = len([{\n    "id": 1,\n    "name": "MainThread"\n}, {\n    "id": 2,\n    "name": "Dummy-6"\n}, {\n    "id": 3,\n    "name": "Thread-7 (worker)"\n}, {\n    "id": 4,\n    "name": "Thread-8 (worker)"\n}])

tests\debugpy\test_threads.py:46: AssertionError