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copied!<p>This problem happens more often on Windows platform, because of smaller Apache's default stack size. There is 1 MB default stack size on Windows, unlike 8 MB on Unix/Linux platforms. It could be a reason, why some for example PHP scripts works properly on Linux, but cause crash of Apache on Windows.</p> <p>Furthermore, the crash is silent (<em>segmentation fault</em>), there is no error message, Apache just stops responding and the child process is restarted. Browser gets no data and renders a blank page, so it's a bit difficult to decide what's wrong.</p> <p>It's a common problem when working with <strong>long regular expressions in PHP</strong>.</p> <p>There is one notice in Apache's error log only, which tells, that child process crashed:</p> <pre><code>Parent: child process exited with status ... -- Restarting </code></pre> <p>The best way to alter the Apache's stack size is using the <strong>ThreadStackSize</strong> directive in the Apache's configuration file. There is a description of the <strong>ThreadStackSize</strong> directive in Apache's documentation: <a href="http://httpd.apache.org/docs/2.2/mod/mpm_common.html#ThreadStackSize" rel="noreferrer">http://httpd.apache.org/docs/2.2/mod/mpm_common.html#ThreadStackSize</a></p> <p>So increase of the Apache's stack size on Windows might looks like this:</p> <pre><code><IfModule mpm_winnt_module> ThreadStackSize 8388608 </IfModule> </code></pre> <p>These lines should be put in the Apache's configuration file. For simplicity, you could put it to <strong>httpd.conf</strong>. Or better (but not necessary), put it to <strong>httpd-mpm.conf</strong> file and in <em>httpd.conf</em> uncomment this line:</p> <pre><code>Include conf/extra/httpd-mpm.conf </code></pre> <p>It sets Apache's stack size to 8 MB, so it's the same as a default value on Linux.</p> <p><em>And don't forget to restart Apache! :)</em></p>

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