[pcre-dev] [Bug 1803] segfault in pcre jit when running twig…

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Tárgy: [pcre-dev] [Bug 1803] segfault in pcre jit when running twig test suite (PHP7)
https://bugs.exim.org/show_bug.cgi?id=1803

--- Comment #23 from Zoltan Herczeg <hzmester@???> ---
Thank you!

> /(?<!^)(?!$)/u


This is a tricky pattern, since it matches to an empty string. But other than
that nothing special with it.

I tried matching it from offset 4 in UTF mode, and the result was 4,4 here. And
that is the expected.


This is still the most confusing part for me:

Breakpoint 8, php_pcre_split_impl (pce=0x555555d33520, 
    subject=0x7fffed42e248 "\303\251\303\204\303\237\343\201\224a", 
    subject_len=10, return_value=0x7ffff381b240, limit_val=-1, 
    flags=<optimized out>)
    at /build/php7.0-WHFaJZ/php7.0-7.0.3/ext/pcre/php_pcre.c:1794
1794            if (count == 0) {
(gdb) print offsets[0]
$52 = -1
(gdb) print offsets[1]
$53 = -1
(gdb) c
Continuing.


JIT cannot return with -1 in offsets[0], except if the original value was -1,
and there is no match.

I really would like to see the value of count before the crash, and I think it
is in $eax or $rax (disassemble can confirm it).

Please print offsets[0] and [1] before and after pcre_exec is called. Please
also print g_notempty as well.

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