Since 8.2.0, automatic multiprocessing causes race conditions in my project

[Schwaneberg]

I got a project that cannot be tested with parallelism, as it requires exclusive access to some resources.
Unfortunately, this also applies during unit testing. This wasn't a problem up to pytest 8.1.2, but it is since 8.2.0.
Since 8.2.0, pytest instantly spawns six child processes, which are blocking each other.
I couldn't find a switch to turn this off nor could I identify the PR that caused this (yet).

[RonnyPfannschmidt]

More context needed

Core pytest doesn't start processes at all

[alkino]

Hello, in our case (I and @pramodk that link the issue above):
We have reproducible segfaults with pytest 8.2.0 on our code.
Once we set pytest back to 8.1.1 it works again.
Running with pytest 8.2.0 with -v or by specifying all files instead of the directory works too (pytest dir/file1.py dir/file2.py instead of pytest dir).

[fossdd]

This can be reproduced by running pytest (v8.2.0) on waitress or black

[github-actions]

This issue is stale because it has the status: needs information label and requested follow-up information was not provided for 14 days.

[github-actions]

This issue was closed because it has the status: needs information label and follow-up information has not been provided for 7 days since being marked as stale.

[Schwaneberg]

I couldn't generate a minimal failing example yet. I'd like to reopen the issue soon. Am So., 26. Mai 2024 um 03:52 Uhr schrieb github-actions[bot] < ***@***.***>:

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This issue was closed because it has the status: needs information label and follow-up information has not been provided for 7 days since being marked as stale. — Reply to this email directly, view it on GitHub <#12278 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AIM6TNNZN6BDHC36LPWKA2DZEE56TAVCNFSM6AAAAABHACBRKSVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCMZRHEZTOMJSGU> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[The-Compiler]

@fossdd What is "this" exactly? As already mentioned, pytest doesn't do any parallelism itself. As for black, it runs pytest 8.2.0 on CI just fine... I also tried running the waitress tests locally with pytest 8.2.1 and they work fine.

Please be more specific - what exactly is happening? Are you sure it's related to this issue at all?