Comment # 3 on bug 1182864 from Petr Gajdos

To some extent minimal testcase in https://bugs.php.net/bug.php?id=78927

:/182864 # cat test.php
<?php
function regex() {
        preg_match('/(foo)(bar)(baz)/', 'foobarbaz', $matches,
PREG_OFFSET_CAPTURE);
}

regex();

$pid = pcntl_fork();
if ($pid == -1) {
        die('error.');
}
else if ($pid) {
        echo 'parent... ';
        pcntl_wait($pid);
        echo 'wait done';
}
else {
        echo 'child.';
}
?>

:/182864 # valgrind -q php test.php
[..]
parent... child.
wait done
==21579== 
==21579== Process terminating with default action of signal 11 (SIGSEGV):
dumping core
==21579==  Bad permissions for mapped region at address 0x531E5C0
==21579==    at 0x4BAC4DB: ??? (in /usr/lib64/libpcre2-8.so.0.10.1)
==21579==    by 0x4BE3FE2: ??? (in /usr/lib64/libpcre2-8.so.0.10.1)
==21579==    by 0x4B92A19: pcre2_code_free_8 (in
/usr/lib64/libpcre2-8.so.0.10.1)
==21579==    by 0x76BC41: php_efree_pcre_cache (php_pcre.c:156)
==21579==    by 0x91C06C: zend_hash_destroy (zend_hash.c:1541)
==21579==    by 0x76D4AF: zm_deactivate_pcre.lto_priv.0 (php_pcre.c:483)
==21579==    by 0x90B413: zend_deactivate_modules (zend_API.c:2636)
==21579==    by 0x88D134: php_request_shutdown (main.c:1895)
==21579==    by 0x9B77AA: do_cli (php_cli.c:1132)
==21579==    by 0x743052: main (php_cli.c:1359)
Segmentation fault (core dumped)
:/182864 #