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BytesIO should be marked as thread-unsafe on 3.13 and 3.14 #100
Description
I saw crashes related to this running the python-isal tests. See also python/cpython#132551.
Unfortunately the fix didn't quite make it in time for 3.14, so we'll need to wait another year to run tests that use BytesIO in parallel.
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ngoldbaum commentedon Jul 24, 2025
Actually, on second thought, this might be trickier than I thought to deal with.
Just using
BytesIOis fine, the problem is if e.g. a test fixture returns aBytesIO. Maybe we need a way to detect that fixtures are unsafe?ngoldbaum commentedon Jul 24, 2025
IMO this one shouldn't block a 0.6.0 release and maybe it's best to just handle this on a case-by-base basis as we run into issues with fixtures using
BytesIO.