Debugings another Drupal PHP 7 failure

So in an effort to fully support PHP 7 out of the box with the eminent release of Drupal 8, we're trying to track down some segmentation faults in our testing infrastructure. One that seems to be causing a lot of failures is listed here. https://bugs.php.net/bug.php?id=70805 Does anyone have any pointers on what might cause a problem with the code? Alternatively as commented on the issue, I'm happy to setup access for someone to valgrind the problem as well if someone wants to help us out.