zend questions and bug #15333

http://bugs.php.net/15333 I've narrowed down the problem, but can't seem to get anywhere with it. The state of the server when the problem occurrs: All serviceable threads have been killed or have timed out. A request is received prompting the spawning of a new thread. The new thread then goes through and copies the global_constants_table, but that has been corrupted somewhere causing an access violation when trying to dereference uninitialized memory. This happens every time the server has been idle for ~10 minutes after serving up php pages. Here are my questions that I haven't been able to track down yet. Hopefully someone can save me some time. 1. What code is executed when a thread times out? zend_shutdown never seems to run (or at least my breakpoints there never fire). 2. It appears that global_constants_table is not global nor constant, each thread has a separate copy. Why is this the case? And if it is meant to be, where is the original global_constants_table. What could be modifying it so that it cannot be copied when a new thread is started? 3. Where would be a good place to start to find the answers to the zend questions that I have as I track this down.