test.test_concurrent_futures.test_deadlock test_pyrepl failed on 1-core-VM

[bmwiedemann]

Bug report

Bug description:

While working on reproducible builds for openSUSE (sponsored by the NLnet NGI0 fund), I found that our python313 package fails to build on 1-core-VMs from two failing tests.

Full build log: https://rb.zq1.de/other/python313/build-j1.log

2 re-run tests:
    test.test_concurrent_futures.test_deadlock test_pyrepl

2 tests failed:
    test.test_concurrent_futures.test_deadlock test_pyrepl

447 tests OK.

Total duration: 3 hour 35 sec
Total tests: run=42,874 (filtered) failures=7 skipped=1,745
Total test files: run=466/468 (filtered) failed=2 skipped=15 resource_denied=4 rerun=2

If those tests cannot pass in such an env, they should be skipped automatically.

CPython versions tested on:

3.13

Operating systems tested on:

Linux

[bmwiedemann]

Now I found, even on a 3-core-VM I get

 2 re-run tests:
     test.test_asyncio.test_server test_pyrepl
 
 1 test failed:
     test.test_asyncio.test_server

so something seems unreliable there.
May overlap with #122136

[Icelain]

I just compiled cpython on my personal machine and test.test_asyncio.test_server fails there as well.

[mcepl]

I just compiled cpython on my personal my personal machine and test.test_asyncio.test_server fails there as well.

What’s your system, @Icelain ?

[Icelain]

Arch Linux
Kernel 6.10.2
Intel i7 12700h

[mcepl]

Could be somehow related to #121719