kkollsga commented on issue #50428:
URL: https://github.com/apache/arrow/issues/50428#issuecomment-4924939222

   Nightly (`25.0.0.dev257`) tested: crash gone. The extension that reliably 
SIGSEGVs with 24.0.0 is clean across repeated runs, both import orders.
   
   The mechanism is mimalloc ≥ 3.2.6's fixed macOS TLS slots, shared by all 
co-resident v3 instances with no ownership check (microsoft/mimalloc#1327). 
24.0.0's 3.2.7 crashes against a 3.3.1 extension because their heap layouts 
differ; 25.0.0's 3.3.1 coexists because the layouts happen to match. A pairing 
where layouts diverge again would re-expose the crash. Bundled ≥ 3.2.6 is the 
exposure window, which is why 23.0.0 with 3.1.5 was unaffected.
   


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