WillAyd commented on PR #45854:
URL: https://github.com/apache/arrow/pull/45854#issuecomment-2751660916

   mimalloc was a red herring with CI; it looks like the test failures were 
only occurring when ASAN was running.
   
   I think what ultimately fixed the segfault was building the arrow_python 
library as a `py.extension_module` within the configuration and linking against 
that. This seems to work on Linux, but on OSX Meson throws the following error:
   
   ```sh
   ../pyarrow/meson.build:125:7: ERROR: target lib.cpython-311-darwin links 
against shared module arrow_python.cpython-311-darwin. This is not permitted on 
OSX
   ```
   
   @eli-schwartz would you happen to have any ideas of the best way to build 
the `arrow_python` module in a cross-platform way?


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