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Date: Fri, 5 Feb 2016 19:37:52 +0100
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Subject: Segmentation fault in PHP 7.0.3 (and earlier versions)
From: sisve@devhost.se (Simon Svensson)

Hi,

I'm using Ondřej Surý's ppa which was recently upgraded to PHP 7.0.3. My
test-suite is causing segmentation faults since 7.0.0 RC5, including the
7.0.3 release.

I can reproduce this consistently by running my test-suite in PHPUnit.
Identifying the tests executing when the fault occurs (using --debug)
and rerunning them one-by-one does not reproduce the segmentation faults.

I'm running this on Ubuntu 14.04.3 LTS. My application is built on with
Laravel 5.1 and Doctrine 2.5. I'm using PHPUnit 4.8 and an in-memory
sqlite database for the tests. (I'm mentioning this to convey what type
of code is running.)

My test-suite works on PHP 5.6 and HHVM.

I've got a gist with a gdb backtrace, with and without opcache. (There's
no difference.)
With: https://gist.github.com/sisve/0f75be357e557d439c19
Without: https://gist.github.com/sisve/01542193a27fd9da2b7b

I've verified that the opcache is disabled by '/usr/bin/php7.0 -i | grep
"opcache.enable"' not returning anything, and '/usr/bin/php7.0 -m' does
not contain any entry for opcache. (I'm unsure if this is enough.)

I've got some older backtraces from my previous failures. These may be
related, or related to something totally different. These have unknown
opcache-status (probably enabled).
PHP 7.0.2: https://gist.github.com/sisve/05b4c4075ef223c4ab52
PHP 7.0.0-RC?: https://gist.github.com/sisve/fe8e1b85b4cc488ff457
PHP 7.0.0-RC5: https://gist.github.com/sisve/7ce5980e05068972b8e6
PHP 7.0.0-RC5: https://gist.github.com/sisve/ad318ca820a38bdb8133

I've been whining some time on irc about this, and finally got my thumb
out of my behind to write this email.

I doubt that these traces are enough to identify and solve the problem.
What can I do to gather more information and debug this further?

// Simon