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Stack overflows can be detected as long as C stack frames between two execute_ex() calls use less than zend.reserved_stack_size bytes of stack. The default value of zend.reserved_stack_size accounts for the largest stack users, but MSAN instrumentation increases usage considerably: php_pcre2_match uses more than 200KiB of stack in some MSAN build, compared to 20KiB without MSAN according to -fstack-usage.