Hi Ralph, I suspect something is wrong with code generation. Maybe the total size of the buffer is incorrect. The four bytes after addr=:001DFFFE affects two pages, and I suspect something is wrong with the page starting from 001E0000 (not allocated or not writable).
Anyway I suspect Philip wants to release PCRE2 as soon as possible, so if you don't mind we could track this down after the release. Regards, Zoltan -------- Eredeti levél -------- Feladó: Ralf Junker < ralfjun...@gmx.de (Link -> mailto:ralfjun...@gmx.de) > Dátum: 2019 november 15 12:50:03 Tárgy: Re: [pcre-dev] Win32 JIT Access Violation Címzett: pcre-dev@exim.org < pcre-dev@exim.org (Link -> mailto:pcre-dev@exim.org) > On 15.11.2019 09:01, Zoltán Herczeg wrote: > thank you for the report. I don't have C++Builder, so I would need > some help. The pattern is quite big, is it possible to simplify it? > Also bisecting the change which broke it would be a great help as > well. Up front: If auto_callout is removed, the AV is removed as well. Other than that, this is the smallest pattern which still triggers an AV. I shortened from beginning and end. I also replaced the consecutive "2" with a hex sequence in case this is easier to debug. /{'{01{2{<!-- -->{3{<!-- -->{456{<!-- -->{7{'{89{A{BC{D/auto_callout Interestingly, the AV is now in sljitNativeX86_common.c, line 316: static SLJIT_INLINE void sljit_unaligned_store_sw(void *addr, sljit_sw value) {<!-- --> SLJIT_MEMCPY(addr, &value, sizeof(value)); // AV now here } This is the call stack: :004aee5e ; _internal_memmove :004ac115 memcpy(void *,const void *,unsigned int) + 0xD :0042DB1E sljit_unaligned_store_sw(addr=:001DFFFE, value=-412) :0042E2EA sljit_generate_code(compiler=:01FE0B10) :00463473 jit_compile(code=:01FF7B70, mode=1) :0046383B pcre2_jit_compile_8(code=:01FF7B70, options=7) :004A46BA process_pattern() :004AB775 main(argc=2, argv=:020519F8) :004b887f ; __startup I will try to bisect later. Ralf -- ## List details at https://lists.exim.org/mailman/listinfo/pcre-dev -- ## List details at https://lists.exim.org/mailman/listinfo/pcre-dev
