gh-127146: Fix Emscripten test suite when run with -uall

[hoodmane]

Emscripten large file support works fine and is required for testZip64LargeFile to work.

And skip more stack overflows
@freakboy3742

• Issue: Emscripten: Get test suite passing #127146

[python-cla-bot]

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[freakboy3742]

Can confirm the test suite now completes for me without crashing. I'm seeing 2 test failures at runtime on the Buildbot machine (using emscripten 4.0.6, running cross-build/wasm32-emscripten/build/python/python.sh -m test -v -uall --rerun -W --single-process):

======================================================================
FAIL: test_mode (test.test_os.MakedirTests.test_mode)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/emscripten/cpython/Lib/test/test_os.py", line 1932, in test_mode
    self.assertEqual(os.stat(parent).st_mode & 0o777, 0o775)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 493 != 509

----------------------------------------------------------------------
Ran 373 tests in 4.888s

FAILED (failures=1, skipped=159)
test test_os failed

and

======================================================================
ERROR: test_sysconfigdata_json (test.test_sysconfig.TestSysConfig.test_sysconfigdata_json)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/emscripten/cpython/Lib/test/test_sysconfig.py", line 662, in test_sysconfigdata_json
    json_config_vars.pop(key)
    ~~~~~~~~~~~~~~~~~~~~^^^^^
KeyError: 'userbase'

----------------------------------------------------------------------
Ran 32 tests in 0.052s

FAILED (errors=1, skipped=6)
test test_sysconfig failed

Are you seeing those failures as well?

[hoodmane]

Nope. Did you run it on this specific commit? The sysconfigdata failure I was seeing in the fall but @FFY00 made some changes that made it go away for me a couple months ago.

Is the test_mode failure consistent or could it be flaky?

[hoodmane]

I will double check everything in my setup and rerun the tests.

[hoodmane]

I can reproduce the test_sysconfig failure and f36c496 fixes it for me.

[hoodmane]

I sometimes get:

======================================================================
FAIL: test_utime_by_indexed (test.test_os.UtimeTests.test_utime_by_indexed)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/rchatham/cpython/Lib/test/test_os.py", line 961, in test_utime_by_indexed
    self._test_utime(set_time)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/home/rchatham/cpython/Lib/test/test_os.py", line 925, in _test_utime
    self.assertAlmostEqual(st.st_atime, atime_ns * 1e-9, delta=1e-5)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 1744017482.524 != 1.002003 within 1e-05 delta (1744017481.521997 difference)

But I cannot reproduce the test_mode failure. Maybe we should xfail it for now to unblock the build bot?

[freakboy3742]

Did you run it on this specific commit?
Is the test_mode failure consistent or could it be flaky?

I've run it twice with 3d49b34, and once with f36c496, and it has failed all three times.

Updating to f36c496 has resolved the sysconfig issue, though.

I have tried to reproduce the failure locally, but the hotel wifi I'm on is currently blocking downloads from GitHub 🙄 . I'll be at a different hotel in about 12 hours, so I can try again there.

[freakboy3742]

I've finally got a chance to test this locally, and I'm seeing the same problem (running on macOS).

[hoodmane]

You okay to skip it and investigate later?

[freakboy3742]

You okay to skip it and investigate later?

I'm not wild about merging an open ended TODO; and given it will be about a week before I'll have a chance to focus on getting the buildbot in place, and this is literally the last piece before we have a clean test run, I'd rather do at least a preliminary investigation so we've got an idea how deep this hole goes.

[hoodmane]

Sounds good. I just wish I could reproduce it. I'll try cleaning everything and rebuild again.