Assertion failure in Objects/call.c `_PyObject_VectorcallDictTstate: Assertion `!_PyErr_Occurred(tstate)' failed.`

[YuanchengJiang]

Bug report

Bug description:

import importlib.machinery as machinery
import importlib.util
import os
import sys

is_apple_mobile = False

if hasattr(machinery, "ExtensionFileLoader"):
    LoaderClass = machinery.ExtensionFileLoader

dummy_name = "fake_extension_module_for_test"

dummy_path = __file__

loader = LoaderClass(dummy_name, dummy_path)
spec = importlib.util.spec_from_loader(dummy_name, loader)
module = importlib.util.module_from_spec(spec)

python: ../Objects/call.c:120: _PyObject_VectorcallDictTstate: Assertion `!_PyErr_Occurred(tstate)' failed.
Aborted (core dumped)

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

[sergey-miryanov]

Traceback:

➜ .\python.bat -X faulthandler ..\issues\b141307.py
Running Debug|x64 interpreter...
Assertion failed: !_PyErr_Occurred(tstate), file X:\Work\cpython\main\Objects\call.c, line 120
Fatal Python error: Aborted

Current thread 0x00005a58 (most recent call first):
  File "<frozen importlib._bootstrap>", line 491 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 1057 in create_module
  File "<frozen importlib._bootstrap>", line 816 in module_from_spec
  File "X:\Work\cpython\issues\b141307.py", line 17 in <module>

Current thread's C stack trace (most recent call first):
  <cannot get C stack on this system>

[itamaro]

smaller repro script:

import importlib.machinery
import importlib.util
dummy_name = "fake_extension_module_for_test"
loader = importlib.machinery.ExtensionFileLoader(dummy_name, __file__)
spec = importlib.util.spec_from_loader(dummy_name, loader)
module = importlib.util.module_from_spec(spec)

reproduces on macOS

$ ./python.exe -X faulthandler ../mre.py
Assertion failed: (!_PyErr_Occurred(tstate)), function _PyObject_VectorcallDictTstate, file call.c, line 120.
Fatal Python error: Aborted

Current thread 0x00000001f0020f40 (most recent call first):
  File "<frozen importlib._bootstrap>", line 491 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 1057 in create_module
  File "<frozen importlib._bootstrap>", line 816 in module_from_spec
  File "/Users/itamaro/work/pybuild/main-dbg/../mre.py", line 6 in <module>

Current thread's C stack trace (most recent call first):
  <system returned no stack trace>
[1]    44105 abort      ./python.exe -X faulthandler ../mre.py

for reference, the import error when using non-debug 3.14 build:

$ uv run --python=3.14 ../mre.py                                                                                                           [10:15:10]
Traceback (most recent call last):
  File "/Users/itamaro/work/pybuild/main-dbg/../mre.py", line 6, in <module>
    module = importlib.util.module_from_spec(spec)
  File "<frozen importlib._bootstrap>", line 816, in module_from_spec
  File "<frozen importlib._bootstrap_external>", line 1056, in create_module
  File "<frozen importlib._bootstrap>", line 491, in _call_with_frames_removed
ImportError: dlopen(/Users/itamaro/work/pybuild/main-dbg/../mre.py, 0x0002): tried: '/Users/itamaro/work/pybuild/main-dbg/../mre.py' (not a mach-o file), [...snip...], '/Users/itamaro/work/pybuild/mre.py' (not a mach-o file)

[picnixz]

It's a duplicate of #141169 (I believe, at least the traceback is identical I think?)

[picnixz]

Just to be sure, but can someone try if this reproduces on a 3.14 debug build? if so, it's not a duplicate, otherwise it's likely a duplicate (I believed that it was the case because the reproducers seem to use the latest main)

[itamaro]

I can confirm that with this patch applied (based on gh-141206), there's no assertion

diff --git a/Python/importdl.c b/Python/importdl.c
index 23a55c39677..885bbe9c5c3 100644
--- a/Python/importdl.c
+++ b/Python/importdl.c
@@ -414,6 +414,7 @@ _PyImport_GetModuleExportHooks(
         *modexport = (PyModExportFunction)exportfunc;
         return 2;
     }
+    PyErr_Clear();

     exportfunc = findfuncptr(
         info->hook_prefixes->init_prefix,

$ ./python.exe -X faulthandler ../mre.py
Traceback (most recent call last):
  File "/Users/itamaro/work/pybuild/main-dbg/../mre.py", line 6, in <module>
    module = importlib.util.module_from_spec(spec)
  File "<frozen importlib._bootstrap>", line 816, in module_from_spec
  File "<frozen importlib._bootstrap_external>", line 1057, in create_module
  File "<frozen importlib._bootstrap>", line 491, in _call_with_frames_removed
ImportError: dlopen(/Users/itamaro/work/pybuild/main-dbg/../mre.py, 0x0002): tried: '/Users/itamaro/work/pybuild/main-dbg/../mre.py' (not a mach-o file), [...], '/Users/itamaro/work/pybuild/mre.py' (not a mach-o file), '/System/Volumes/Preboot/Cryptexes/OS/Users/itamaro/work/pybuild/mre.py' (no such file), '/Users/itamaro/work/pybuild/mre.py' (not a mach-o file)

[sergey-miryanov]

3.14

➜ .\python.bat -X faulthandler ..\issues\b141307.py   
Running Debug|x64 interpreter...
Traceback (most recent call last):
  File "X:\Work\cpython\issues\b141307.py", line 17, in <module>
    module = importlib.util.module_from_spec(spec)
  File "<frozen importlib._bootstrap>", line 816, in module_from_spec
  File "<frozen importlib._bootstrap_external>", line 1057, in create_module
  File "<frozen importlib._bootstrap>", line 491, in _call_with_frames_removed
ImportError: DLL load failed while importing fake_extension_module_for_test: %1 is not a valid Win32 application.

[picnixz]

Ok, let's close it as a duplicate then.