Description:
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I'm running Apache with PHP 5.5.10 and mysqlnd_ms 1.5.2, which has been stable for the past year. If I enable opcache and have an error in the msyqlnd_ms json configuration file, there will be a segfault on a second call to any apache php page. So, assume I run Apache with a single thread and call any PHP script e.g. http://localhost/foo.php. That first PHP call will work, but create a mysqlnd_ms error that you may not even realize unless you are using a php page that attempts to use mysql. The next time you call the page, a segfault is thrown in php_mysqlnd_ms.c:132

I realize this is an odd one, but it took me a long time to figure this one out so I thought I would at least share my findings.

I was also able to recreate the issue with php 5.5.31.

Test script:
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Create an invalid configuration file.
Enable opcode caching
Limit Apache to 1 child
curl http://locahost/any.php
curl http://localhost/any.php <- segfault