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venv/lib/python3.11/site-packages/greenlet/tests/test_leaks.py Normal file
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# -*- coding: utf-8 -*-
"""
Testing scenarios that may have leaked.
"""
from __future__ import print_function, absolute_import, division
import sys
import gc
import time
import weakref
import threading
import greenlet
from . import TestCase
from .leakcheck import fails_leakcheck
from .leakcheck import ignores_leakcheck
from .leakcheck import RUNNING_ON_MANYLINUX
# pylint:disable=protected-access
assert greenlet.GREENLET_USE_GC # Option to disable this was removed in 1.0
class HasFinalizerTracksInstances(object):
EXTANT_INSTANCES = set()
def __init__(self, msg):
self.msg = sys.intern(msg)
self.EXTANT_INSTANCES.add(id(self))
def __del__(self):
self.EXTANT_INSTANCES.remove(id(self))
def __repr__(self):
return "<HasFinalizerTracksInstances at 0x%x %r>" % (
id(self), self.msg
)
@classmethod
def reset(cls):
cls.EXTANT_INSTANCES.clear()
class TestLeaks(TestCase):
def test_arg_refs(self):
args = ('a', 'b', 'c')
refcount_before = sys.getrefcount(args)
# pylint:disable=unnecessary-lambda
g = greenlet.greenlet(
lambda *args: greenlet.getcurrent().parent.switch(*args))
for _ in range(100):
g.switch(*args)
self.assertEqual(sys.getrefcount(args), refcount_before)
def test_kwarg_refs(self):
kwargs = {}
# pylint:disable=unnecessary-lambda
g = greenlet.greenlet(
lambda **kwargs: greenlet.getcurrent().parent.switch(**kwargs))
for _ in range(100):
g.switch(**kwargs)
self.assertEqual(sys.getrefcount(kwargs), 2)
@staticmethod
def __recycle_threads():
# By introducing a thread that does sleep we allow other threads,
# that have triggered their __block condition, but did not have a
# chance to deallocate their thread state yet, to finally do so.
# The way it works is by requiring a GIL switch (different thread),
# which does a GIL release (sleep), which might do a GIL switch
# to finished threads and allow them to clean up.
def worker():
time.sleep(0.001)
t = threading.Thread(target=worker)
t.start()
time.sleep(0.001)
t.join(10)
def test_threaded_leak(self):
gg = []
def worker():
# only main greenlet present
gg.append(weakref.ref(greenlet.getcurrent()))
for _ in range(2):
t = threading.Thread(target=worker)
t.start()
t.join(10)
del t
greenlet.getcurrent() # update ts_current
self.__recycle_threads()
greenlet.getcurrent() # update ts_current
gc.collect()
greenlet.getcurrent() # update ts_current
for g in gg:
self.assertIsNone(g())
def test_threaded_adv_leak(self):
gg = []
def worker():
# main and additional *finished* greenlets
ll = greenlet.getcurrent().ll = []
def additional():
ll.append(greenlet.getcurrent())
for _ in range(2):
greenlet.greenlet(additional).switch()
gg.append(weakref.ref(greenlet.getcurrent()))
for _ in range(2):
t = threading.Thread(target=worker)
t.start()
t.join(10)
del t
greenlet.getcurrent() # update ts_current
self.__recycle_threads()
greenlet.getcurrent() # update ts_current
gc.collect()
greenlet.getcurrent() # update ts_current
for g in gg:
self.assertIsNone(g())
def assertClocksUsed(self):
used = greenlet._greenlet.get_clocks_used_doing_optional_cleanup()
self.assertGreaterEqual(used, 0)
# we don't lose the value
greenlet._greenlet.enable_optional_cleanup(True)
used2 = greenlet._greenlet.get_clocks_used_doing_optional_cleanup()
self.assertEqual(used, used2)
self.assertGreater(greenlet._greenlet.CLOCKS_PER_SEC, 1)
def _check_issue251(self,
manually_collect_background=True,
explicit_reference_to_switch=False):
# See https://github.com/python-greenlet/greenlet/issues/251
# Killing a greenlet (probably not the main one)
# in one thread from another thread would
# result in leaking a list (the ts_delkey list).
# We no longer use lists to hold that stuff, though.
# For the test to be valid, even empty lists have to be tracked by the
# GC
assert gc.is_tracked([])
HasFinalizerTracksInstances.reset()
greenlet.getcurrent()
greenlets_before = self.count_objects(greenlet.greenlet, exact_kind=False)
background_glet_running = threading.Event()
background_glet_killed = threading.Event()
background_greenlets = []
# XXX: Switching this to a greenlet subclass that overrides
# run results in all callers failing the leaktest; that
# greenlet instance is leaked. There's a bound method for
# run() living on the stack of the greenlet in g_initialstub,
# and since we don't manually switch back to the background
# greenlet to let it "fall off the end" and exit the
# g_initialstub function, it never gets cleaned up. Making the
# garbage collector aware of this bound method (making it an
# attribute of the greenlet structure and traversing into it)
# doesn't help, for some reason.
def background_greenlet():
# Throw control back to the main greenlet.
jd = HasFinalizerTracksInstances("DELETING STACK OBJECT")
greenlet._greenlet.set_thread_local(
'test_leaks_key',
HasFinalizerTracksInstances("DELETING THREAD STATE"))
# Explicitly keeping 'switch' in a local variable
# breaks this test in all versions
if explicit_reference_to_switch:
s = greenlet.getcurrent().parent.switch
s([jd])
else:
greenlet.getcurrent().parent.switch([jd])
bg_main_wrefs = []
def background_thread():
glet = greenlet.greenlet(background_greenlet)
bg_main_wrefs.append(weakref.ref(glet.parent))
background_greenlets.append(glet)
glet.switch() # Be sure it's active.
# Control is ours again.
del glet # Delete one reference from the thread it runs in.
background_glet_running.set()
background_glet_killed.wait(10)
# To trigger the background collection of the dead
# greenlet, thus clearing out the contents of the list, we
# need to run some APIs. See issue 252.
if manually_collect_background:
greenlet.getcurrent()
t = threading.Thread(target=background_thread)
t.start()
background_glet_running.wait(10)
greenlet.getcurrent()
lists_before = self.count_objects(list, exact_kind=True)
assert len(background_greenlets) == 1
self.assertFalse(background_greenlets[0].dead)
# Delete the last reference to the background greenlet
# from a different thread. This puts it in the background thread's
# ts_delkey list.
del background_greenlets[:]
background_glet_killed.set()
# Now wait for the background thread to die.
t.join(10)
del t
# As part of the fix for 252, we need to cycle the ceval.c
# interpreter loop to be sure it has had a chance to process
# the pending call.
self.wait_for_pending_cleanups()
lists_after = self.count_objects(list, exact_kind=True)
greenlets_after = self.count_objects(greenlet.greenlet, exact_kind=False)
# On 2.7, we observe that lists_after is smaller than
# lists_before. No idea what lists got cleaned up. All the
# Python 3 versions match exactly.
self.assertLessEqual(lists_after, lists_before)
# On versions after 3.6, we've successfully cleaned up the
# greenlet references thanks to the internal "vectorcall"
# protocol; prior to that, there is a reference path through
# the ``greenlet.switch`` method still on the stack that we
# can't reach to clean up. The C code goes through terrific
# lengths to clean that up.
if not explicit_reference_to_switch \
and greenlet._greenlet.get_clocks_used_doing_optional_cleanup() is not None:
# If cleanup was disabled, though, we may not find it.
self.assertEqual(greenlets_after, greenlets_before)
if manually_collect_background:
# TODO: Figure out how to make this work!
# The one on the stack is still leaking somehow
# in the non-manually-collect state.
self.assertEqual(HasFinalizerTracksInstances.EXTANT_INSTANCES, set())
else:
# The explicit reference prevents us from collecting it
# and it isn't always found by the GC either for some
# reason. The entire frame is leaked somehow, on some
# platforms (e.g., MacPorts builds of Python (all
# versions!)), but not on other platforms (the linux and
# windows builds on GitHub actions and Appveyor). So we'd
# like to write a test that proves that the main greenlet
# sticks around, and we can on my machine (macOS 11.6,
# MacPorts builds of everything) but we can't write that
# same test on other platforms. However, hopefully iteration
# done by leakcheck will find it.
pass
if greenlet._greenlet.get_clocks_used_doing_optional_cleanup() is not None:
self.assertClocksUsed()
def test_issue251_killing_cross_thread_leaks_list(self):
self._check_issue251()
def test_issue251_with_cleanup_disabled(self):
greenlet._greenlet.enable_optional_cleanup(False)
try:
self._check_issue251()
finally:
greenlet._greenlet.enable_optional_cleanup(True)
@fails_leakcheck
def test_issue251_issue252_need_to_collect_in_background(self):
# Between greenlet 1.1.2 and the next version, this was still
# failing because the leak of the list still exists when we
# don't call a greenlet API before exiting the thread. The
# proximate cause is that neither of the two greenlets from
# the background thread are actually being destroyed, even
# though the GC is in fact visiting both objects. It's not
# clear where that leak is? For some reason the thread-local
# dict holding it isn't being cleaned up.
#
# The leak, I think, is in the CPYthon internal function that
# calls into green_switch(). The argument tuple is still on
# the C stack somewhere and can't be reached? That doesn't
# make sense, because the tuple should be collectable when
# this object goes away.
#
# Note that this test sometimes spuriously passes on Linux,
# for some reason, but I've never seen it pass on macOS.
self._check_issue251(manually_collect_background=False)
@fails_leakcheck
def test_issue251_issue252_need_to_collect_in_background_cleanup_disabled(self):
self.expect_greenlet_leak = True
greenlet._greenlet.enable_optional_cleanup(False)
try:
self._check_issue251(manually_collect_background=False)
finally:
greenlet._greenlet.enable_optional_cleanup(True)
@fails_leakcheck
def test_issue251_issue252_explicit_reference_not_collectable(self):
self._check_issue251(
manually_collect_background=False,
explicit_reference_to_switch=True)
UNTRACK_ATTEMPTS = 100
def _only_test_some_versions(self):
# We're only looking for this problem specifically on 3.11,
# and this set of tests is relatively fragile, depending on
# OS and memory management details. So we want to run it on 3.11+
# (obviously) but not every older 3.x version in order to reduce
# false negatives. At the moment, those false results seem to have
# resolved, so we are actually running this on 3.8+
assert sys.version_info[0] >= 3
if sys.version_info[:2] < (3, 8):
self.skipTest('Only observed on 3.11')
if RUNNING_ON_MANYLINUX:
self.skipTest("Slow and not worth repeating here")
@ignores_leakcheck
# Because we're just trying to track raw memory, not objects, and running
# the leakcheck makes an already slow test slower.
def test_untracked_memory_doesnt_increase(self):
# See https://github.com/gevent/gevent/issues/1924
# and https://github.com/python-greenlet/greenlet/issues/328
self._only_test_some_versions()
def f():
return 1
ITER = 10000
def run_it():
for _ in range(ITER):
greenlet.greenlet(f).switch()
# Establish baseline
for _ in range(3):
run_it()
# uss: (Linux, macOS, Windows): aka "Unique Set Size", this is
# the memory which is unique to a process and which would be
# freed if the process was terminated right now.
uss_before = self.get_process_uss()
for count in range(self.UNTRACK_ATTEMPTS):
uss_before = max(uss_before, self.get_process_uss())
run_it()
uss_after = self.get_process_uss()
if uss_after <= uss_before and count > 1:
break
self.assertLessEqual(uss_after, uss_before)
def _check_untracked_memory_thread(self, deallocate_in_thread=True):
self._only_test_some_versions()
# Like the above test, but what if there are a bunch of
# unfinished greenlets in a thread that dies?
# Does it matter if we deallocate in the thread or not?
EXIT_COUNT = [0]
def f():
try:
greenlet.getcurrent().parent.switch()
except greenlet.GreenletExit:
EXIT_COUNT[0] += 1
raise
return 1
ITER = 10000
def run_it():
glets = []
for _ in range(ITER):
# Greenlet starts, switches back to us.
# We keep a strong reference to the greenlet though so it doesn't
# get a GreenletExit exception.
g = greenlet.greenlet(f)
glets.append(g)
g.switch()
return glets
test = self
class ThreadFunc:
uss_before = uss_after = 0
glets = ()
ITER = 2
def __call__(self):
self.uss_before = test.get_process_uss()
for _ in range(self.ITER):
self.glets += tuple(run_it())
for g in self.glets:
test.assertIn('suspended active', str(g))
# Drop them.
if deallocate_in_thread:
self.glets = ()
self.uss_after = test.get_process_uss()
# Establish baseline
uss_before = uss_after = None
for count in range(self.UNTRACK_ATTEMPTS):
EXIT_COUNT[0] = 0
thread_func = ThreadFunc()
t = threading.Thread(target=thread_func)
t.start()
t.join(30)
self.assertFalse(t.is_alive())
if uss_before is None:
uss_before = thread_func.uss_before
uss_before = max(uss_before, thread_func.uss_before)
if deallocate_in_thread:
self.assertEqual(thread_func.glets, ())
self.assertEqual(EXIT_COUNT[0], ITER * thread_func.ITER)
del thread_func # Deallocate the greenlets; but this won't raise into them
del t
if not deallocate_in_thread:
self.assertEqual(EXIT_COUNT[0], 0)
if deallocate_in_thread:
self.wait_for_pending_cleanups()
uss_after = self.get_process_uss()
# See if we achieve a non-growth state at some point. Break when we do.
if uss_after <= uss_before and count > 1:
break
self.wait_for_pending_cleanups()
uss_after = self.get_process_uss()
self.assertLessEqual(uss_after, uss_before, "after attempts %d" % (count,))
@ignores_leakcheck
# Because we're just trying to track raw memory, not objects, and running
# the leakcheck makes an already slow test slower.
def test_untracked_memory_doesnt_increase_unfinished_thread_dealloc_in_thread(self):
self._check_untracked_memory_thread(deallocate_in_thread=True)
@ignores_leakcheck
# Because the main greenlets from the background threads do not exit in a timely fashion,
# we fail the object-based leakchecks.
def test_untracked_memory_doesnt_increase_unfinished_thread_dealloc_in_main(self):
self._check_untracked_memory_thread(deallocate_in_thread=False)
if __name__ == '__main__':
__import__('unittest').main()