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Fix exclusive arena allocation across child arenas - #1404

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OscarTHZhang:OscarTHZhang/fix-arena-iteration
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microsoft:dev3from
OscarTHZhang:OscarTHZhang/fix-arena-iteration

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Search child arenas after the requested parent arena is exhausted, allowing exclusive heaps to use managed memory areas larger than 16 GiB. Add a lightweight regression test covering a 24 GiB arena in Debug and Release builds.

@OscarTHZhang

OscarTHZhang commented Sep 16, 2026

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Daan (@daanx) This is fixing #1403

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