Numerous refleaks on main#103879
Description
https://buildbot.python.org/all/#/release_status shows that the refleak buildbots are failing on current main. Example output on https://buildbot.python.org/all/#/builders/75/builds/745/steps/5/logs/warnings__111_.
Failing tests:
Details
test_functools leaked [1, 1, 2] references, sum=4 test_warnings leaked [4, 4, 4] references, sum=12 test_ipaddress leaked [6, 6, 6] references, sum=18 test_zoneinfo leaked [7, 6, 11] references, sum=24 FAIL: test_flock (__main__.FNTLEINTRTest.test_flock) test_random leaked [1, 2, 4] references, sum=7 test_statistics leaked [175, 174, 175] references, sum=524 test_dataclasses leaked [3, 3, 2] references, sum=8 test_argparse leaked [69, 70, 76] references, sum=215 /home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.refleak/build/Lib/test/support/__init__.py:743: ResourceWarning: unclosed <socket.socket [closed] fd=3, family=2, type=1, proto=6> ResourceWarning: Enable tracemalloc to get the object allocation traceback ./home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.refleak/build/Lib/test/support/__init__.py:743: ResourceWarning: unclosed <socket.socket [closed] fd=3, family=2, type=1, proto=6> ResourceWarning: Enable tracemalloc to get the object allocation traceback ./home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.refleak/build/Lib/test/support/__init__.py:743: ResourceWarning: unclosed <socket.socket [closed] fd=3, family=2, type=1, proto=6> ResourceWarning: Enable tracemalloc to get the object allocation traceback ./home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.refleak/build/Lib/test/support/__init__.py:743: ResourceWarning: unclosed <socket.socket [closed] fd=3, family=2, type=1, proto=6> ResourceWarning: Enable tracemalloc to get the object allocation traceback ./home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.refleak/build/Lib/test/support/__init__.py:743: ResourceWarning: unclosed <socket.socket [closed] fd=3, family=2, type=1, proto=6> ResourceWarning: Enable tracemalloc to get the object allocation traceback ./home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.refleak/build/Lib/test/support/__init__.py:743: ResourceWarning: unclosed <socket.socket [closed] fd=3, family=2, type=1, proto=6> ResourceWarning: Enable tracemalloc to get the object allocation traceback test_tarfile leaked [17, 17, 16] references, sum=50 test_typing leaked [95, 121, 95] references, sum=311 test_typing leaked [1, 14, 1] memory blocks, sum=16 test_lib2to3 leaked [5, 8, 6] references, sum=19 test_shutil leaked [2, 2, 2] references, sum=6 test_unittest leaked [8, 12, 15] references, sum=35 test_logging leaked [3, 2, 1] references, sum=6 test__xxsubinterpreters leaked [46, 45, 45] references, sum=136 test_mailbox leaked [2, 3, 2] references, sum=7 test_socket leaked [24, 23, 23] references, sum=70 test_htmlparser leaked [2, 2, 2] references, sum=6 test_regrtest leaked [9, 12, 8] references, sum=29 test_datetime leaked [11, 11, 11] references, sum=33 test_nntplib leaked [1, 3, 2] references, sum=6 test_ftplib leaked [10, 13, 9] references, sum=32 test_interpreters leaked [54, 54, 54] references, sum=162 test_zipfile leaked [3, 4, 4] references, sum=11 test_sys_settrace leaked [6, 6, 6] references, sum=18 test_descr leaked [3, 65, 67] references, sum=135 test_compile leaked [7, 7, 7] references, sum=21 test_bytes leaked [2, 2, 2] references, sum=6 test_ast leaked [9, 9, 9] references, sum=27 test_poplib leaked [3, 3, 2] references, sum=8 test_types leaked [8, 50, 43] references, sum=101 test_concurrent_futures leaked [11, 12, 11] references, sum=34 test_genericalias leaked [2, 2, 3] references, sum=7 test_math leaked [32, 31, 33] references, sum=96 test_numeric_tower leaked [2, 1, 2] references, sum=5 test_capi leaked [99, 99, 99] references, sum=297 test_import leaked [170, 171, 168] references, sum=509 test_import leaked [71, 71, 70] memory blocks, sum=212 .test test_monitoring failed -- multiple errors occurred; run in verbose mode for details test_selectors leaked [5, 6, 4] references, sum=15 test_email leaked [27, 26, 25] references, sum=78 test_subprocess leaked [1, 1, 1] references, sum=3 test_struct leaked [1, 1, 1] references, sum=3 test_weakref leaked [1, 1, 1] references, sum=3 test_imaplib leaked [2, 2, 1] references, sum=5 0:45:54 load avg: 0.13 Re-running failed tests in verbose mode 0:45:54 load avg: 0.13 Re-running test_functools in verbose mode test_functools leaked [1, 1, 2] references, sum=4 0:45:55 load avg: 0.13 Re-running test_warnings in verbose mode test_warnings leaked [4, 4, 4] references, sum=12 0:45:59 load avg: 0.20 Re-running test_ipaddress in verbose mode test_ipaddress leaked [6, 6, 6] references, sum=18 0:46:00 load avg: 0.20 Re-running test_zoneinfo in verbose mode test_zoneinfo leaked [7, 6, 11] references, sum=24 I saw similar leaks triggering the refleak buildbots on #103866 and #103764, before I realized the issue was probably on main.
Based on @sunmy2019's work in #103764 (comment), we're likely leaking references to the object.__setattr__ wrapper descriptor.