From b4baacee1adc06edbe30ac7574d17a8cd168e2e0 Mon Sep 17 00:00:00 2001 From: Serhiy Storchaka Date: Thu, 6 Jul 2017 08:09:03 +0300 Subject: [PATCH] bpo-30814: Fixed a race condition when import a submodule from a package. (#2580) --- Lib/importlib/_bootstrap.py | 28 +- Lib/test/test_import/__init__.py | 28 + Lib/test/test_import/data/package/__init__.py | 2 + .../test_import/data/package/submodule.py | 0 Misc/NEWS | 2 + Python/import.c | 17 +- Python/importlib.h | 612 +++++++++--------- 7 files changed, 352 insertions(+), 337 deletions(-) create mode 100644 Lib/test/test_import/data/package/__init__.py create mode 100644 Lib/test/test_import/data/package/submodule.py diff --git a/Lib/importlib/_bootstrap.py b/Lib/importlib/_bootstrap.py index 891bd062bb0..f7c89caca80 100644 --- a/Lib/importlib/_bootstrap.py +++ b/Lib/importlib/_bootstrap.py @@ -956,9 +956,19 @@ def _find_and_load_unlocked(name, import_): def _find_and_load(name, import_): - """Find and load the module, and release the import lock.""" - with _ModuleLockManager(name): - return _find_and_load_unlocked(name, import_) + """Find and load the module.""" + _imp.acquire_lock() + if name not in sys.modules: + with _ModuleLockManager(name): + return _find_and_load_unlocked(name, import_) + module = sys.modules[name] + if module is None: + _imp.release_lock() + message = ('import of {} halted; ' + 'None in sys.modules'.format(name)) + raise ModuleNotFoundError(message, name=name) + _lock_unlock_module(name) + return module def _gcd_import(name, package=None, level=0): @@ -973,17 +983,7 @@ def _gcd_import(name, package=None, level=0): _sanity_check(name, package, level) if level > 0: name = _resolve_name(name, package, level) - _imp.acquire_lock() - if name not in sys.modules: - return _find_and_load(name, _gcd_import) - module = sys.modules[name] - if module is None: - _imp.release_lock() - message = ('import of {} halted; ' - 'None in sys.modules'.format(name)) - raise ModuleNotFoundError(message, name=name) - _lock_unlock_module(name) - return module + return _find_and_load(name, _gcd_import) def _handle_fromlist(module, fromlist, import_): diff --git a/Lib/test/test_import/__init__.py b/Lib/test/test_import/__init__.py index a78fae12d8f..8424ed7aa3a 100644 --- a/Lib/test/test_import/__init__.py +++ b/Lib/test/test_import/__init__.py @@ -10,6 +10,8 @@ import py_compile import random import stat import sys +import threading +import time import unittest import unittest.mock as mock import textwrap @@ -380,6 +382,32 @@ class ImportTests(unittest.TestCase): self.assertEqual(str(cm.exception), "cannot import name 'does_not_exist' from '' (unknown location)") + def test_concurrency(self): + sys.path.insert(0, os.path.join(os.path.dirname(__file__), 'data')) + try: + exc = None + def run(): + event.wait() + try: + import package + except BaseException as e: + nonlocal exc + exc = e + + for i in range(10): + event = threading.Event() + threads = [threading.Thread(target=run) for x in range(2)] + try: + with test.support.start_threads(threads, event.set): + time.sleep(0) + finally: + sys.modules.pop('package', None) + sys.modules.pop('package.submodule', None) + if exc is not None: + raise exc + finally: + del sys.path[0] + @skip_if_dont_write_bytecode class FilePermissionTests(unittest.TestCase): diff --git a/Lib/test/test_import/data/package/__init__.py b/Lib/test/test_import/data/package/__init__.py new file mode 100644 index 00000000000..a4f2bc3400c --- /dev/null +++ b/Lib/test/test_import/data/package/__init__.py @@ -0,0 +1,2 @@ +import package.submodule +package.submodule diff --git a/Lib/test/test_import/data/package/submodule.py b/Lib/test/test_import/data/package/submodule.py new file mode 100644 index 00000000000..e69de29bb2d diff --git a/Misc/NEWS b/Misc/NEWS index 232fb7547d2..2f2fafff5ee 100644 --- a/Misc/NEWS +++ b/Misc/NEWS @@ -10,6 +10,8 @@ What's New in Python 3.7.0 alpha 1? Core and Builtins ----------------- +- bpo-30814: Fixed a race condition when import a submodule from a package. + - bpo-30736: The internal unicodedata database has been upgraded to Unicode 10.0. diff --git a/Python/import.c b/Python/import.c index d8a207b4b36..6cdb3661744 100644 --- a/Python/import.c +++ b/Python/import.c @@ -1532,18 +1532,7 @@ PyImport_ImportModuleLevelObject(PyObject *name, PyObject *globals, } mod = PyDict_GetItem(interp->modules, abs_name); - if (mod == Py_None) { - PyObject *msg = PyUnicode_FromFormat("import of %R halted; " - "None in sys.modules", abs_name); - if (msg != NULL) { - PyErr_SetImportErrorSubclass(PyExc_ModuleNotFoundError, msg, - abs_name, NULL); - Py_DECREF(msg); - } - mod = NULL; - goto error; - } - else if (mod != NULL) { + if (mod != NULL && mod != Py_None) { _Py_IDENTIFIER(__spec__); _Py_IDENTIFIER(_initializing); _Py_IDENTIFIER(_lock_unlock_module); @@ -1584,10 +1573,6 @@ PyImport_ImportModuleLevelObject(PyObject *name, PyObject *globals, } } else { -#ifdef WITH_THREAD - _PyImport_AcquireLock(); -#endif - /* _bootstrap._find_and_load() releases the import lock */ mod = _PyObject_CallMethodIdObjArgs(interp->importlib, &PyId__find_and_load, abs_name, interp->import_func, NULL); diff --git a/Python/importlib.h b/Python/importlib.h index bd4d0038f61..f5303f76c48 100644 --- a/Python/importlib.h +++ b/Python/importlib.h @@ -1520,313 +1520,311 @@ const unsigned char _Py_M__importlib[] = { 42,0,0,0,0,1,4,1,14,1,4,1,10,1,10,2, 10,1,10,1,10,1,2,1,10,1,14,1,16,1,20,1, 10,1,8,1,20,2,8,1,4,2,10,1,22,1,114,180, - 0,0,0,99,2,0,0,0,0,0,0,0,2,0,0,0, - 10,0,0,0,67,0,0,0,115,30,0,0,0,116,0,124, - 0,131,1,143,12,1,0,116,1,124,0,124,1,131,2,83, - 0,81,0,82,0,88,0,100,1,83,0,41,2,122,54,70, - 105,110,100,32,97,110,100,32,108,111,97,100,32,116,104,101, - 32,109,111,100,117,108,101,44,32,97,110,100,32,114,101,108, - 101,97,115,101,32,116,104,101,32,105,109,112,111,114,116,32, - 108,111,99,107,46,78,41,2,114,42,0,0,0,114,180,0, - 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