[Mod-security-developers] help me!pls

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hi:
     I ran into a problem when read modsecurity-2.7.7 source code，when http request came，modsecurity will executive function(create_tx_context()),In this fuction call ‍
apr_allocator_create(&allocator)，but I cann't find any apr_allocator_free() fuction or apr_allocator_destroy() function to release allocator memory，The program will not cause memory leaks? if not，when does modsecurity  release memory? ‍I can not sleep well because of this puzzle problem！pls reply me！！‍


Thanks
                                jarwin