bpo-30814: Fixed a race condition when import a submodule from a package. (#2580)

diff --git a/Lib/importlib/_bootstrap.py b/Lib/importlib/_bootstrap.py
index 891bd062bb0d591d6cd75a784ae6e726ef711404..f7c89caca8060ef7b6f5b042d8c89c96b5ea6f28 100644 (file)
--- 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 a78fae12d8f5aff0c32626f0a3eac323c0983725..8424ed7aa3aa6dad879449360c73b75005bd3461 100644 (file)
--- 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 module name>' (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 (file)
index 0000000..a4f2bc3
--- /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 (file)
index 0000000..e69de29

diff --git a/Misc/NEWS b/Misc/NEWS
index 232fb7547d2153ea7c1c3fafc369a824839b1e8c..2f2fafff5ee910e479bf1f7b2de0f35082795607 100644 (file)
--- 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 d8a207b4b369afc564a0c6277fe570608d7783da..6cdb3661744434630a1130f5d69994023a5f75ff 100644 (file)
--- 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 bd4d0038f612f4d2b4c2bce66668f6d67c81d0c4..f5303f76c484c105d0eb8542b2905c5ddb1168a1 100644 (file)
--- 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,
-    0,0,41,2,114,15,0,0,0,114,179,0,0,0,114,10,
+    0,0,0,99,2,0,0,0,0,0,0,0,4,0,0,0,
+    11,0,0,0,67,0,0,0,115,104,0,0,0,116,0,160,
+    1,161,0,1,0,124,0,116,2,106,3,107,7,114,44,116,
+    4,124,0,131,1,143,12,1,0,116,5,124,0,124,1,131,
+    2,83,0,81,0,82,0,88,0,116,2,106,3,124,0,25,
+    0,125,2,124,2,100,1,107,8,114,92,116,0,160,6,161,
+    0,1,0,100,2,160,7,124,0,161,1,125,3,116,8,124,
+    3,124,0,100,3,141,2,130,1,116,9,124,0,131,1,1,
+    0,124,2,83,0,41,4,122,25,70,105,110,100,32,97,110,
+    100,32,108,111,97,100,32,116,104,101,32,109,111,100,117,108,
+    101,46,78,122,40,105,109,112,111,114,116,32,111,102,32,123,
+    125,32,104,97,108,116,101,100,59,32,78,111,110,101,32,105,
+    110,32,115,121,115,46,109,111,100,117,108,101,115,41,1,114,
+    15,0,0,0,41,10,114,46,0,0,0,114,137,0,0,0,
+    114,14,0,0,0,114,79,0,0,0,114,42,0,0,0,114,
+    180,0,0,0,114,47,0,0,0,114,38,0,0,0,114,178,
+    0,0,0,114,56,0,0,0,41,4,114,15,0,0,0,114,
+    179,0,0,0,114,83,0,0,0,114,67,0,0,0,114,10,
     0,0,0,114,10,0,0,0,114,11,0,0,0,218,14,95,
     102,105,110,100,95,97,110,100,95,108,111,97,100,190,3,0,
-    0,115,4,0,0,0,0,2,10,1,114,181,0,0,0,114,
-    19,0,0,0,99,3,0,0,0,0,0,0,0,5,0,0,
-    0,4,0,0,0,67,0,0,0,115,120,0,0,0,116,0,
-    124,0,124,1,124,2,131,3,1,0,124,2,100,1,107,4,
-    114,32,116,1,124,0,124,1,124,2,131,3,125,0,116,2,
-    160,3,161,0,1,0,124,0,116,4,106,5,107,7,114,60,
-    116,6,124,0,116,7,131,2,83,0,116,4,106,5,124,0,
-    25,0,125,3,124,3,100,2,107,8,114,108,116,2,160,8,
-    161,0,1,0,100,3,160,9,124,0,161,1,125,4,116,10,
-    124,4,124,0,100,4,141,2,130,1,116,11,124,0,131,1,
-    1,0,124,3,83,0,41,5,97,50,1,0,0,73,109,112,
-    111,114,116,32,97,110,100,32,114,101,116,117,114,110,32,116,
-    104,101,32,109,111,100,117,108,101,32,98,97,115,101,100,32,
-    111,110,32,105,116,115,32,110,97,109,101,44,32,116,104,101,
-    32,112,97,99,107,97,103,101,32,116,104,101,32,99,97,108,
-    108,32,105,115,10,32,32,32,32,98,101,105,110,103,32,109,
-    97,100,101,32,102,114,111,109,44,32,97,110,100,32,116,104,
-    101,32,108,101,118,101,108,32,97,100,106,117,115,116,109,101,
-    110,116,46,10,10,32,32,32,32,84,104,105,115,32,102,117,
-    110,99,116,105,111,110,32,114,101,112,114,101,115,101,110,116,
-    115,32,116,104,101,32,103,114,101,97,116,101,115,116,32,99,
-    111,109,109,111,110,32,100,101,110,111,109,105,110,97,116,111,
-    114,32,111,102,32,102,117,110,99,116,105,111,110,97,108,105,
-    116,121,10,32,32,32,32,98,101,116,119,101,101,110,32,105,
-    109,112,111,114,116,95,109,111,100,117,108,101,32,97,110,100,
-    32,95,95,105,109,112,111,114,116,95,95,46,32,84,104,105,
-    115,32,105,110,99,108,117,100,101,115,32,115,101,116,116,105,
-    110,103,32,95,95,112,97,99,107,97,103,101,95,95,32,105,
-    102,10,32,32,32,32,116,104,101,32,108,111,97,100,101,114,
-    32,100,105,100,32,110,111,116,46,10,10,32,32,32,32,114,
-    19,0,0,0,78,122,40,105,109,112,111,114,116,32,111,102,
-    32,123,125,32,104,97,108,116,101,100,59,32,78,111,110,101,
-    32,105,110,32,115,121,115,46,109,111,100,117,108,101,115,41,
-    1,114,15,0,0,0,41,12,114,175,0,0,0,114,163,0,
-    0,0,114,46,0,0,0,114,137,0,0,0,114,14,0,0,
-    0,114,79,0,0,0,114,181,0,0,0,218,11,95,103,99,
-    100,95,105,109,112,111,114,116,114,47,0,0,0,114,38,0,
-    0,0,114,178,0,0,0,114,56,0,0,0,41,5,114,15,
-    0,0,0,114,161,0,0,0,114,162,0,0,0,114,83,0,
-    0,0,114,67,0,0,0,114,10,0,0,0,114,10,0,0,
-    0,114,11,0,0,0,114,182,0,0,0,196,3,0,0,115,
-    28,0,0,0,0,9,12,1,8,1,12,1,8,1,10,1,
-    10,1,10,1,8,1,8,1,4,1,6,1,12,1,8,1,
-    114,182,0,0,0,99,3,0,0,0,0,0,0,0,6,0,
-    0,0,17,0,0,0,67,0,0,0,115,164,0,0,0,116,
-    0,124,0,100,1,131,2,114,160,100,2,124,1,107,6,114,
-    58,116,1,124,1,131,1,125,1,124,1,160,2,100,2,161,
-    1,1,0,116,0,124,0,100,3,131,2,114,58,124,1,160,
-    3,124,0,106,4,161,1,1,0,120,100,124,1,68,0,93,
-    92,125,3,116,0,124,0,124,3,131,2,115,64,100,4,160,
-    5,124,0,106,6,124,3,161,2,125,4,121,14,116,7,124,
-    2,124,4,131,2,1,0,87,0,113,64,4,0,116,8,107,
-    10,114,154,1,0,125,5,1,0,122,20,124,5,106,9,124,
-    4,107,2,114,136,119,64,130,0,87,0,89,0,100,5,100,
-    5,125,5,126,5,88,0,113,64,88,0,113,64,87,0,124,
-    0,83,0,41,6,122,238,70,105,103,117,114,101,32,111,117,
-    116,32,119,104,97,116,32,95,95,105,109,112,111,114,116,95,
-    95,32,115,104,111,117,108,100,32,114,101,116,117,114,110,46,
-    10,10,32,32,32,32,84,104,101,32,105,109,112,111,114,116,
-    95,32,112,97,114,97,109,101,116,101,114,32,105,115,32,97,
-    32,99,97,108,108,97,98,108,101,32,119,104,105,99,104,32,
-    116,97,107,101,115,32,116,104,101,32,110,97,109,101,32,111,
-    102,32,109,111,100,117,108,101,32,116,111,10,32,32,32,32,
-    105,109,112,111,114,116,46,32,73,116,32,105,115,32,114,101,
-    113,117,105,114,101,100,32,116,111,32,100,101,99,111,117,112,
-    108,101,32,116,104,101,32,102,117,110,99,116,105,111,110,32,
-    102,114,111,109,32,97,115,115,117,109,105,110,103,32,105,109,
-    112,111,114,116,108,105,98,39,115,10,32,32,32,32,105,109,
-    112,111,114,116,32,105,109,112,108,101,109,101,110,116,97,116,
-    105,111,110,32,105,115,32,100,101,115,105,114,101,100,46,10,
-    10,32,32,32,32,114,127,0,0,0,250,1,42,218,7,95,
-    95,97,108,108,95,95,122,5,123,125,46,123,125,78,41,10,
-    114,4,0,0,0,114,126,0,0,0,218,6,114,101,109,111,
-    118,101,218,6,101,120,116,101,110,100,114,184,0,0,0,114,
-    38,0,0,0,114,1,0,0,0,114,58,0,0,0,114,178,
-    0,0,0,114,15,0,0,0,41,6,114,83,0,0,0,218,
-    8,102,114,111,109,108,105,115,116,114,179,0,0,0,218,1,
-    120,90,9,102,114,111,109,95,110,97,109,101,90,3,101,120,
-    99,114,10,0,0,0,114,10,0,0,0,114,11,0,0,0,
-    218,16,95,104,97,110,100,108,101,95,102,114,111,109,108,105,
-    115,116,221,3,0,0,115,32,0,0,0,0,10,10,1,8,
-    1,8,1,10,1,10,1,12,1,10,1,10,1,14,1,2,
-    1,14,1,16,4,10,1,2,1,24,1,114,189,0,0,0,
-    99,1,0,0,0,0,0,0,0,3,0,0,0,6,0,0,
-    0,67,0,0,0,115,146,0,0,0,124,0,160,0,100,1,
-    161,1,125,1,124,0,160,0,100,2,161,1,125,2,124,1,
-    100,3,107,9,114,82,124,2,100,3,107,9,114,78,124,1,
-    124,2,106,1,107,3,114,78,116,2,106,3,100,4,124,1,
-    155,2,100,5,124,2,106,1,155,2,100,6,157,5,116,4,
-    100,7,100,8,141,3,1,0,124,1,83,0,124,2,100,3,
-    107,9,114,96,124,2,106,1,83,0,116,2,106,3,100,9,
-    116,4,100,7,100,8,141,3,1,0,124,0,100,10,25,0,
-    125,1,100,11,124,0,107,7,114,142,124,1,160,5,100,12,
-    161,1,100,13,25,0,125,1,124,1,83,0,41,14,122,167,
-    67,97,108,99,117,108,97,116,101,32,119,104,97,116,32,95,
-    95,112,97,99,107,97,103,101,95,95,32,115,104,111,117,108,
-    100,32,98,101,46,10,10,32,32,32,32,95,95,112,97,99,
-    107,97,103,101,95,95,32,105,115,32,110,111,116,32,103,117,
-    97,114,97,110,116,101,101,100,32,116,111,32,98,101,32,100,
-    101,102,105,110,101,100,32,111,114,32,99,111,117,108,100,32,
-    98,101,32,115,101,116,32,116,111,32,78,111,110,101,10,32,
-    32,32,32,116,111,32,114,101,112,114,101,115,101,110,116,32,
-    116,104,97,116,32,105,116,115,32,112,114,111,112,101,114,32,
-    118,97,108,117,101,32,105,115,32,117,110,107,110,111,119,110,
-    46,10,10,32,32,32,32,114,130,0,0,0,114,89,0,0,
-    0,78,122,32,95,95,112,97,99,107,97,103,101,95,95,32,
-    33,61,32,95,95,115,112,101,99,95,95,46,112,97,114,101,
-    110,116,32,40,122,4,32,33,61,32,250,1,41,233,3,0,
-    0,0,41,1,90,10,115,116,97,99,107,108,101,118,101,108,
-    122,89,99,97,110,39,116,32,114,101,115,111,108,118,101,32,
-    112,97,99,107,97,103,101,32,102,114,111,109,32,95,95,115,
-    112,101,99,95,95,32,111,114,32,95,95,112,97,99,107,97,
-    103,101,95,95,44,32,102,97,108,108,105,110,103,32,98,97,
-    99,107,32,111,110,32,95,95,110,97,109,101,95,95,32,97,
-    110,100,32,95,95,112,97,116,104,95,95,114,1,0,0,0,
-    114,127,0,0,0,114,117,0,0,0,114,19,0,0,0,41,
-    6,114,30,0,0,0,114,119,0,0,0,114,167,0,0,0,
-    114,168,0,0,0,114,169,0,0,0,114,118,0,0,0,41,
-    3,218,7,103,108,111,98,97,108,115,114,161,0,0,0,114,
-    82,0,0,0,114,10,0,0,0,114,10,0,0,0,114,11,
-    0,0,0,218,17,95,99,97,108,99,95,95,95,112,97,99,
-    107,97,103,101,95,95,252,3,0,0,115,30,0,0,0,0,
-    7,10,1,10,1,8,1,18,1,22,2,10,1,4,1,8,
-    1,6,2,6,2,10,1,8,1,8,1,14,1,114,193,0,
-    0,0,99,5,0,0,0,0,0,0,0,9,0,0,0,5,
-    0,0,0,67,0,0,0,115,166,0,0,0,124,4,100,1,
-    107,2,114,18,116,0,124,0,131,1,125,5,110,36,124,1,
-    100,2,107,9,114,30,124,1,110,2,105,0,125,6,116,1,
-    124,6,131,1,125,7,116,0,124,0,124,7,124,4,131,3,
-    125,5,124,3,115,150,124,4,100,1,107,2,114,84,116,0,
-    124,0,160,2,100,3,161,1,100,1,25,0,131,1,83,0,
-    124,0,115,92,124,5,83,0,116,3,124,0,131,1,116,3,
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+    27,18,35,8,7,8,47,8,8,
 };