[Backport 3.3] [Bug #20886] Avoid double-free in regex timeout after stack_double #12063
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As of 1057485, it's possible to crash on a double free due to `stk_alloc` AKA `msa->stack_p` being freed twice, once at the end of match_at and a second time in `FREE_MATCH_ARG` in the parent caller. Fixes [Bug #20886]
k0kubun
approved these changes
Nov 12, 2024
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Backport of #12030 to 3.3