gh-128002: add test_asyncio.test_free_threading to tsan tests

[kumaraditya303]

• Issue: Audit asyncio thread safety  #128002

[colesbury]

Do you have time to look at the other TSAN reported races in test_asyncio?

[kumaraditya303]

Do you have time to look at the other TSAN reported races in test_asyncio?

What are the other TSAN races?

[colesbury]

If you run the test_asyncio tests under TSAN you'll see a bunch of races. Here are the ones I've seen when running it:

https://gist.github.com/colesbury/210e1e1c60d38dbfd92e5226d7848b38

There are also a few additional ones when run with the GIL enabled, because it doesn't use some of the atomic operations that we use in the free threading build.

I wouldn't worry about the frame_clear race for now, but I think the other ones, including the file descriptor races can be fixed.

[kumaraditya303]

If you run the test_asyncio tests under TSAN you'll see a bunch of races. Here are the ones I've seen when running it:

https://gist.github.com/colesbury/210e1e1c60d38dbfd92e5226d7848b38

There are also a few additional ones when run with the GIL enabled, because it doesn't use some of the atomic operations that we use in the free threading build.

Thanks! I will look into it.

[colesbury]

To follow up on my previous comment: I think that fixing the file descriptor races might involve changing the test code to avoid concurrent close() operations with operations that use the sockets, but I'm not entirely sure.