Last modified: 2014-04-30 01:43:15 UTC
When trying to install MediaWiki on CentOS 5 (using the packaged version of PHP 5.3.3), I got the following error: Creating administrator user account... Warning: preg_match(): Compilation failed: assertion expected after (?( at offset 115 in /var/www/html/w/includes/utils/IP.php on line 88 Warning: preg_match(): Compilation failed: assertion expected after (?( at offset 115 in /var/www/html/w/includes/utils/IP.php on line 88 done This is probably because of Gerrit change #66304, which rendered the regex RE_IPV6_ADD incompatible with the PCRE 6.6 that comes with CentOS 5, though CentOS 6 should be fine. So we have two options: * decide not to support PHP binaries that are built to use a system version of PCRE older than 7.2, adding to the installer a check for this; or * revert the change. In either case, the patch should be backported to 1.22.
Change 100390 had a related patch set uploaded by PleaseStand: Restore compatibility with curl < 7.16.2 https://gerrit.wikimedia.org/r/100390
(In reply to comment #1) > Change 100390 had a related patch set uploaded by PleaseStand: > Restore compatibility with curl < 7.16.2 > > https://gerrit.wikimedia.org/r/100390 Wrong bug...
I guess the CentOS version of PHP is compiled with a specific PCRE version which is most probably the one coming with the OS instead of the one bundled within PHP. Kevin can you run `php -i` and paste there the 'pcre' section? Example output for me (Mac OS X): pcre PCRE (Perl Compatible Regular Expressions) Support => enabled PCRE Library Version => 8.02 2010-03-19 Directive => Local Value => Master Value pcre.backtrack_limit => 1000000 => 1000000 pcre.recursion_limit => 100000 => 100000 On a Precise instance having php5 5.3.10-1ubuntu3.8+wmf2 PCRE Library Version => 8.12 2011-01-15 Can you also paste the result of `ldd /usr/bin/php |fgrep pcre`. Again on Precise that yields: libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f6a65e75000) Then use readlink against the /lib.. file to find out the version: $ readlink /lib/x86_64-linux-gnu/libpcre.so.3 libpcre.so.3.12.1 $ And the version of libpcre has given by rpm or yum :-D PHP 5.3.3 (out in July 2010) comes with bundled PCRE version 8.0. Additionally CentOS package does not use the expected pcre version so I am afraid this bug is going to be a WONTFIX.
(In reply to comment #3) > Kevin can you run `php -i` and paste there the 'pcre' section? Example output > for me (Mac OS X): Configure Command => './configure' '--build=i386-redhat-linux-gnu' [...] '--with-pcre-regex=/usr' [...] pcre PCRE (Perl Compatible Regular Expressions) Support => enabled PCRE Library Version => 6.6 06-Feb-2006 Directive => Local Value => Master Value pcre.backtrack_limit => 100000 => 100000 pcre.recursion_limit => 100000 => 100000 So yes, the PCRE version is the problem. > PHP 5.3.3 (out in July 2010) comes with bundled PCRE version 8.0. > Additionally > CentOS package does not use the expected pcre version so I am afraid this bug > is going to be a WONTFIX. Agreed. I nevertheless filed this report so I have something to refer to when I add an installer check for it.
*** Bug 58253 has been marked as a duplicate of this bug. ***
So if we don't revert the change, for those who are stuck on RHEL/CentOS 5 and are using that distribution's php53 package, we would advise upgrading to PHP 5.4 using any of several unofficial RPMs/repos that don't use the system PCRE. Would that be an acceptable answer, or is it in fact necessary to support the base install of this six-year-old distribution for a little while longer (until PHP 5.3 support is dropped)?
(In reply to comment #6) > So if we don't revert the change, for those who are stuck on RHEL/CentOS 5 > and > are using that distribution's php53 package, we would advise upgrading to PHP > 5.4 using any of several unofficial RPMs/repos that don't use the system > PCRE. They could as well upgrade to a php53 package that wasn't compiled against the system PCRE. It may even be possible that they could just upgrade their system PCRE.
Discussion is getting split between this bug and bug 58253. Copying the Marks and bug 58253 is cross-referenced with [[mw:MediaWiki 1.22/Known issues]].
Change 102081 had a related patch set uploaded by PleaseStand: Check for very old PCRE versions in installer and updater https://gerrit.wikimedia.org/r/102081
The patch points to a MediaWiki page that is supposed to offer some explanation: https://www.mediawiki.org/wiki/Manual:Errors_and_symptoms/PCRE However, that page is empty. Is there a better article to point to?
As explained in the comments on the patch, that page is currently a draft located in user-space.
*** Bug 59765 has been marked as a duplicate of this bug. ***
Change 108843 had a related patch set uploaded by MarkAHershberger: Check for very old PCRE versions in installer and updater https://gerrit.wikimedia.org/r/108843
Change 108843 merged by jenkins-bot: Check for very old PCRE versions in installer and updater https://gerrit.wikimedia.org/r/108843
Change 102081 merged by jenkins-bot: Check for very old PCRE versions in installer and updater https://gerrit.wikimedia.org/r/102081
Patch merged to 1.22.x and git master. Closing as FIXED.
