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Date: Sat, 6 Feb 2016 19:10:53 +0100
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Subject: Re: [PHP-DEV] Segmentation fault in PHP 7.0.3 (and earlier versions)
From: sisve@devhost.se (Simon Svensson)

On 05/02/16 22:29, Rasmus Lerdorf wrote:
> On 02/05/2016 11:39 AM, Simon Svensson wrote:
>> I am unable to reproduce the error with this recompiled source, both
>> with the /usr/local/php70/bin/php and /usr/local/php70-debug/bin/php.
>> This is the same experience I had with earlier releases, where I have
>> been unable to reproduce the segmentation faults when recompiling (but
>> always have them occur from the ppa).
>>
>> Is there any guide for compiling the source? I could attempt to setup a
>> new virtual machine with Ubuntu 14.04 (instead of php7dev's Debian) to
>> reproduce the error, but I do know know the steps needed to compile
>> everything.
>>
>> The newly build, and working, versions:
>>
>> /usr/local/php70/bin/php --version:
>> PHP 7.0.4-dev (cli) (built: Feb  5 2016 19:14:08) ( NTS )
>> Copyright (c) 1997-2016 The PHP Group
>> Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
>>     with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend
>> Technologies
>>
>> /usr/local/php70-debug/bin/php --version:
>> PHP 7.0.4-dev (cli) (built: Feb  5 2016 19:19:10) ( NTS DEBUG )
>> Copyright (c) 1997-2016 The PHP Group
>> Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
>>     with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend
>> Technologies
> 
> "php -i" will show you the configure flags that were used to build it,
> so you could try to match those to see if you can reproduce with sources
> from php.net. Otherwise, if it is something that only happens with the
> distro build then there isn't a while lot we can do to help you.
> 
> -Rasmus
> 
> 

An update to avoid leaving the thread hanging in suspense.

I was in contact with Ondřej Surý, the author of the PPA I was using,
and got help in grabbing build-logs so that I should be able to
reproduce the compile locally, this time without all the optimization.
However, since I still do not speak configure-ish I failed to resolve
all packages/libraries needed for a complete build, but I managed to
smash my keyboard enough to get a working configure & make.

My test-suite now terminates like this:

PHPUnit 4.8.21 by Sebastian Bergmann and contributors.

Runtime:    PHP 7.0.3
Configuration:  /root/web/phpunit.xml

...........................................   43 / 1229 (  3%)
...........................................   86 / 1229 (  6%)
...........................................  129 / 1229 ( 10%)
...........................................  172 / 1229 ( 13%)
...........................................  215 / 1229 ( 17%)
...............R...........................  258 / 1229 ( 20%)
...........................................  301 / 1229 ( 24%)
...........................................  344 / 1229 ( 27%)
.R.R.....................R.................  387 / 1229 ( 31%)
...........................................  430 / 1229 ( 34%)
...........................................  473 / 1229 ( 38%)
...........................................  516 / 1229 ( 41%)
...........................................  559 / 1229 ( 45%)
...........................................  602 / 1229 ( 48%)
...........................................  645 / 1229 ( 52%)
.php: /root/php-src/Zend/zend_execute.h:275:
zend_vm_stack_free_call_frame_ex: Assertion
`(executor_globals.vm_stack_top) > (zval *) (executor_globals.vm_stack)
&& (executor_globals.vm_stack_end) > (zval *)
(executor_globals.vm_stack) && (executor_globals.vm_stack_top) <=
(executor_globals.vm_stack_end)' failed.
Aborted (core dumped)

The failed assertion and my backtrace matches exactly that of
https://bugs.php.net/bug.php?id=71474 which was fixed a few days ago,
and is not part of the 7.0.3 release. It's part of the PHP-7.0 branch,
so I presume this will be fixed in the 7.0.4 release.

I've recompiled using the PHP-7.0 branch, and my test-suite works there.
I look forward to the 7.0.4 release!

// Simon