`test_external_inspection`: `test_async_remote_stack_trace` fails intermittently

[encukou]

Bug report

test_async_remote_stack_trace and test_asyncgen_remote_stack_trace from test_external_inspection. For example: on build 1128 on Debian root buildbot

======================================================================
FAIL: test_async_remote_stack_trace (test.test_external_inspection.TestGetStackTrace.test_async_remote_stack_trace) (task_factory_variant='asyncio.new_event_loop')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_external_inspection.py", line 269, in test_async_remote_stack_trace
    self.assertEqual(stack_trace, expected_stack_trace)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: Lists differ: [[('c[62 chars]y', 10), ('c4', '/tmp/test_python_0gbnot0i/tmp[1293 chars]]]]]] != [[('c[62 chars]y', 11), ('c4', '/tmp/test_python_0gbnot0i/tmp[1308 chars]]]]]]
First differing element 0:
[('c5[61 chars]y', 10), ('c4', '/tmp/test_python_0gbnot0i/tmp[179 chars] 21)]
[('c5[61 chars]y', 11), ('c4', '/tmp/test_python_0gbnot0i/tmp[179 chars] 21)]
Diff is 2008 characters long. Set self.maxDiff to None to see it.
======================================================================
FAIL: test_async_remote_stack_trace (test.test_external_inspection.TestGetStackTrace.test_async_remote_stack_trace) (task_factory_variant='new_eager_loop')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_external_inspection.py", line 269, in test_async_remote_stack_trace
    self.assertEqual(stack_trace, expected_stack_trace)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: Lists differ: [[('c[62 chars]y', 10), ('c4', '/tmp/test_python_0gbnot0i/tmp[1293 chars]]]]]] != [[('c[62 chars]y', 11), ('c4', '/tmp/test_python_0gbnot0i/tmp[1308 chars]]]]]]
First differing element 0:
[('c5[61 chars]y', 10), ('c4', '/tmp/test_python_0gbnot0i/tmp[179 chars] 21)]
[('c5[61 chars]y', 11), ('c4', '/tmp/test_python_0gbnot0i/tmp[179 chars] 21)]
Diff is 2008 characters long. Set self.maxDiff to None to see it.
----------------------------------------------------------------------

[vstinner]

I closed my issue #133428 as a duplicate of this one.

[pablogsal]

Will take a look today but the problem seems to be that matching line numbers is racy

[vstinner]

The issue was maybe fixed by #133422.

[vstinner]

Failure one hour ago on PPC64LE Fedora Stable Refleaks 3.x: https://buildbot.python.org/#/builders/280/builds/1893

FAIL: test_async_remote_stack_trace (test.test_external_inspection.TestGetStackTrace.test_async_remote_stack_trace) (task_factory_variant='asyncio.new_event_loop')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-ppc64le.refleak/build/Lib/test/test_external_inspection.py", line 269, in test_async_remote_stack_trace
    self.assertEqual(stack_trace, expected_stack_trace)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: Lists differ: [[('c[62 chars]y', 10), ('c4', '/tmp/test_python_qxb4meok/tmp[1449 chars]]]]]] != [[('c[62 chars]y', 11), ('c4', '/tmp/test_python_qxb4meok/tmp[1464 chars]]]]]]

First differing element 0:
[('c5[61 chars]y', 10), ('c4', '/tmp/test_python_qxb4meok/tmp[179 chars] 21)]
[('c5[61 chars]y', 11), ('c4', '/tmp/test_python_qxb4meok/tmp[179 chars] 21)]

Diff is 2164 characters long. Set self.maxDiff to None to see it.

[pablogsal]

There are more places where the line numbers may change but we can use the same technique

[vstinner]

There are more places where the line numbers may change but we can use the same technique

Right. Please see my fix #133433.