If you have opcache loaded, disable optimizations
I'm not picking on opcache, it's great, but some of it's optimizations have been known to cause faults.
If that doesn't work, even though your code may be slower, try unloading opcache first.
If any of this changes or fixes the problem, update the bug report you made.
Disable all unnecessary extensions at once.
Begin to enable all your extensions individually, thoroughly testing after each configuration change.
If you find the problem extension, update your bug report with more info.