[Bug 1407990] Re: apache2.4 mod-php5.5 random segmentation faults in zend_stack_push() and zend_hash_find()

[Gerrit Venema]

The bug is instantly reproducible on a fresh Ubuntu 14.04.

Install server.
apt-get install apache2 php5 netcat

Setup a small PHP script with output in /var/www/html/
For Example as test.php
<?php
 echo date('U').PHP_EOL;
?>

shutdown Apache service:
apache2ctl stop

Disable opcache with semicolon in front in
/etc/php5/apache2/conf.d/05-opcache.ini

Start Apache debug server in separate shell
apache2ctl -X

Execute this script (thanks to biggi at stefna dot is):
echo -e "GET /test.php HTTP/1.1\nHost: localhost\n\nGET /test.php HTTP/1.1\nHost: localhost\n\n"|nc localhost 80

Result: immediate segfault

If you do only one request per connection, no problem
If you activate opcache, you will only get one response, the second one appears on the stdout of the debug apache
If you fill the opcache it will segfault if it can't fit the script anymore

I confirmed the same behaviour on Centos 7 with its default packaged
Apache 2.4.6, so this is an upstream bug.

-- 
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to php5 in Ubuntu.
https://bugs.launchpad.net/bugs/1407990

Title:
  apache2.4 mod-php5.5 random segmentation faults in zend_stack_push()
  and  zend_hash_find()

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/php5/+bug/1407990/+subscriptions