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When huge arena is disabled (e.g. `oversize_threshold:0`), `arena_init_huge` updates the global `oversize_threshold` but not `a0`'s per-arena `pac.oversize_threshold`, which was set to `OVERSIZE_THRESHOLD_DEFAULT` (8MB) before conf parsing. This causes allocations >= 8MB through `a0` to enter `arena_choose_huge` where `huge_arena_ind` is still 0, hitting `assert(!malloc_initialized())`. Update `a0`'s threshold in the disabled path, matching what the enabled path already does. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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