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gh-117657: Enable test_opcache under TSAN (GH-129831)

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Fix a few thread-safety bugs to enable test_opcache when run with TSAN:

 * Use relaxed atomics when clearing `ht->_spec_cache.getitem`
   (gh-115999)
 * Add temporary suppression for type slot modifications (gh-127266)
 * Use atomic load when reading `*dictptr`
This commit is contained in:
Sam Gross 2025-02-11 16:53:08 -05:00 • committed by GitHub
parent ed816f1a70
commit f151d27159
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GPG key ID: B5690EEEBB952194
4 changed files with 9 additions and 3 deletions
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1
Lib/test/libregrtest/tsan.py
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@ -13,6 +13,7 @@ TSAN_TESTS = [
'test_importlib',
'test_io',
'test_logging',
'test_opcache',
'test_queue',
'test_signal',
'test_socket',

2
Objects/object.c
View file

@ -1612,7 +1612,7 @@ _PyObject_GetMethod(PyObject *obj, PyObject *name, PyObject **method)
else {
PyObject **dictptr = _PyObject_ComputedDictPointer(obj);
if (dictptr != NULL) {
dict = *dictptr;
dict = FT_ATOMIC_LOAD_PTR_ACQUIRE(*dictptr);
}
else {
dict = NULL;

6
Objects/typeobject.c
View file

@ -1085,7 +1085,8 @@ type_modified_unlocked(PyTypeObject *type)
if (PyType_HasFeature(type, Py_TPFLAGS_HEAPTYPE)) {
// This field *must* be invalidated if the type is modified (see the
// comment on struct _specialization_cache):
((PyHeapTypeObject *)type)->_spec_cache.getitem = NULL;
FT_ATOMIC_STORE_PTR_RELAXED(
((PyHeapTypeObject *)type)->_spec_cache.getitem, NULL);
}
}
@ -1166,7 +1167,8 @@ type_mro_modified(PyTypeObject *type, PyObject *bases) {
if (PyType_HasFeature(type, Py_TPFLAGS_HEAPTYPE)) {
// This field *must* be invalidated if the type is modified (see the
// comment on struct _specialization_cache):
((PyHeapTypeObject *)type)->_spec_cache.getitem = NULL;
FT_ATOMIC_STORE_PTR_RELAXED(
((PyHeapTypeObject *)type)->_spec_cache.getitem, NULL);
}
}

3
Tools/tsan/suppressions_free_threading.txt
View file

@ -49,5 +49,8 @@ race_top:rangeiter_next
# gh-129748: test.test_free_threading.test_slots.TestSlots.test_object
race_top:mi_block_set_nextx
# gh-127266: type slot updates are not thread-safe (test_opcache.test_load_attr_method_lazy_dict)
race_top:update_one_slot
# https://gist.github.com/mpage/6962e8870606cfc960e159b407a0cb40
thread:pthread_create