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To: Giovanni Giacobbi <giovanni@giacobbi.net>, PHP Internals List
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Thread-Topic: [PHP-DEV] PCRE JIT broken in PHP 7.2
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Date: Mon, 18 Sep 2017 16:29:24 +0000
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Subject: Re: [PHP-DEV] PCRE JIT broken in PHP 7.2
From: dmitry@zend.com (Dmitry Stogov)

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The problem may be caused by "incorrect" dynamic linking to different libpc=
re instances.

e.g one libbcre is use by Apache or some Apache module and another is embed=
ded into PHP.


The backtrace would be useful, to prove this guess.


Thanks. Dmitry.


________________________________
From: giovanni.g@gmail.com <giovanni.g@gmail.com> on behalf of Giovanni Gia=
cobbi <giovanni@giacobbi.net>
Sent: Monday, September 18, 2017 2:28:35 PM
To: PHP Internals List
Subject: [PHP-DEV] PCRE JIT broken in PHP 7.2

Greetings,

just an heads up, I started testing my project with PHP 7.2.0RC2 but it was
causing a segmentation fault.

I tracked down the problem to preg_match(), in particular when JIT is
enabled and ONLY when running through Apache2 with event MPM. This problem
does not occur with command line invocation.

Here are the versions I tested, same environment:
7.1.9  works with PCRE JIT enabled
7.2.0alpha1   broken
7.2.0rc2  broken

Build command line:
./configure \
  --with-apxs2=3D/usr/local/apache2/bin/apxs \
  --with-fpm-user=3Dhttpd \
  --with-fpm-group=3Dhttpd \
  --disable-cgi \
  --enable-intl \
  --with-layout=3DGNU \
  --enable-maintainer-zts \
  --with-gettext=3Dstatic \
  --with-iconv \
  --with-mysqli=3Dmysqlnd \
  --enable-exif \
  --with-openssl \
  --with-curl

The effect i observed is the following:

var_dump(preg_match('/^a/', "a"));    =3D> int(0)
var_dump(preg_match('/a/', "a"));     =3D> segmentation fault

If you need any further information let me know.

Kind regards

--
Giovanni Giacobbi

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