pitrou opened a new pull request #8615:
URL: https://github.com/apache/arrow/pull/8615
Fix a lock ordering-induced deadlock between the Python GIL
and the `std::once_flag` lock used in
`arrow::py::internal::InitPandasStaticData`.
Thread A:
* takes the GIL
* calls `arrow::py::internal::InitPandasStaticData`
* which calls `std::call_once`, which acquires the lock inside the
`std::once_flag`
* which imports the `pandas` module
* which releases the GIL before reading the code object from disk
* and then tries to re-acquire the GIL
Thread B:
* takes the GIL
* calls `arrow::py::internal::InitPandasStaticData`
* which calls `std::call_once`, which tries to acquire the lock inside the
`std::once_flag`
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