If I run the coveragepy test suite with some small modifications to run with TSAN support and under pytest-run-parallel, I see data races inside coveragepy and CPython as well as some test failures. I ...
test_signal crashed when run at the 325th test under a system load of 9.87: on a machine with 3 CPUs, that means that the machine was very busy (stressed) by other tests running in parallel. 0:07:31 ...
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