Re: php/zend and apache segmentation faults

[Christopher Jones <christopher.jones@xxxxxxxxxx>]

On 10/19/2012 03:08 AM, tariq wali wrote:
> Hi,
>
> I am new to the group here and would quickly like to understand if
> this is the right place to share questions on php/zend ? Just to
> give an idea we at info edge ltd run most of the web properties on
> LAMP stack and use various versions of PHP(5.2 to latest 5.4.x) with
> Zend Engine .
>
> Evidently we get a lot of segmentation faults as logged by apache in
> error logs and when we try to debug them they more or less point
> issues to zend . Although I am not a programmer and probably do not
> understand the exact cause of segfaults but I am willing to believe
> this is something to do with PHP . we have eliminated all doubts on
> hardware/apache file system and so forth . Here is a quick output of
> gdb backtrace on one of the cores that apache wrote on a segfault .

Since you may need to log a bug, focus on the most recent 5.4 version
(not the 5.2 that you gave a stack trace for).

Have you disabled the opcode cache (APC et al)?

In recent versions of PHP have you disabled the garbage collector with
zend.enable_gc = Off ?

Have you used valgrind? https://bugs.php.net/bugs-getting-valgrind-log.php

Something recent comes to mind, but this is purely a random thought:
http://news.php.net/php.internals/63529
I'll let you compare backtraces and so forth to see if you think it
is relevant.

The bottom line is that you'll likely need to construct a reproducible
test case and log a bug.

Chris

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