[3.6] bpo-30814: Fixed a race condition when import a submodule from a package. (GH-2580). (#2598)

(cherry picked from commit b4baacee1adc06edbe30ac7574d17a8cd168e2e0)

7 files changed, 340 insertions, 325 deletions

diff --git a/Lib/importlib/_bootstrap.py b/Lib/importlib/_bootstrap.py
index a531a03..f812a18 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 4aca9e5..3291d08 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
@@ -350,6 +352,32 @@ class ImportTests(unittest.TestCase):
         with self.assertRaises(ImportError):
             from test_from_import_AttributeError import does_not_exist
 
+    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 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
index 0000000..e69de29
--- /dev/null
+++ b/Lib/test/test_import/data/package/submodule.py
diff --git a/Misc/NEWS b/Misc/NEWS
index 92ccf52..89876f8 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,8 @@ What's New in Python 3.6.3 release candidate 1?
 Core and Builtins
 -----------------
 
+- bpo-30814: Fixed a race condition when import a submodule from a package.
+
 - bpo-30597: ``print`` now shows expected input in custom error message when
   used as a Python 2 statement. Patch by Sanyam Khurana.
 
diff --git a/Python/import.c b/Python/import.c
index a23a102..a9aa5b3 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -1533,18 +1533,7 @@ 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);
@@ -1585,10 +1574,6 @@ 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 4607c40..0584477 100644
--- a/Python/importlib.h
+++ b/Python/importlib.h
@@ -1521,302 +1521,300 @@ const unsigned char _Py_M__importlib[] = {
     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,
-    0,114,179,0,0,0,114,10,0,0,0,114,10,0,0,0,
+    0,0,0,0,4,0,0,0,11,0,0,0,67,0,0,0,
+    115,104,0,0,0,116,0,106,1,131,0,1,0,124,0,116,
+    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,
+    8,114,92,116,0,106,6,131,0,1,0,100,2,106,7,124,
+    0,131,1,125,3,116,8,124,3,124,0,100,3,141,2,130,
+    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,
-    124,2,131,3,125,0,116,2,106,3,131,0,1,0,124,0,
-    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,
-    107,8,114,108,116,2,106,8,131,0,1,0,100,3,106,9,
-    124,0,131,1,125,4,116,10,124,4,124,0,100,4,141,2,
-    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,
+    95,108,111,97,100,190,3,0,0,115,24,0,0,0,0,2,
+    8,1,10,1,10,1,16,1,10,1,8,1,8,1,4,1,
+    6,1,12,1,8,1,114,181,0,0,0,114,19,0,0,0,
+    99,3,0,0,0,0,0,0,0,3,0,0,0,4,0,0,
+    0,67,0,0,0,115,42,0,0,0,116,0,124,0,124,1,
+    124,2,131,3,1,0,124,2,100,1,107,4,114,32,116,1,
+    124,0,124,1,124,2,131,3,125,0,116,2,124,0,116,3,
+    131,2,83,0,41,2,97,50,1,0,0,73,109,112,111,114,
+    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,
+    0,0,41,4,114,175,0,0,0,114,163,0,0,0,114,181,
     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,
-    1,124,1,106,2,100,2,131,1,1,0,116,0,124,0,100,
-    3,131,2,114,58,124,1,106,3,124,0,106,4,131,1,1,
-    0,120,100,124,1,68,0,93,92,125,3,116,0,124,0,124,
-    3,131,2,115,64,100,4,106,5,124,0,106,6,124,3,131,
-    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,
-    0,0,124,0,106,0,100,1,131,1,125,1,124,0,106,0,
-    100,2,131,1,125,2,124,1,100,3,107,9,114,82,124,2,
-    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,
-    114,142,124,1,106,5,100,12,131,1,100,13,25,0,125,1,
-    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,
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 };