ZF-11858: Zend_Captcha_Image garbage collection can result in fatal error when run in parallel
Zend_Captcha_Image garbage collector sometimes results in a fatal error: SplFileInfo::getMTime(): stat failed for XXX.png in in Zend/Captcha/Image.php, at line 583.
I belive that this error occurs only under some load, when two (or more) garbage collectors fire at the same time. One GC tries to run SplFileInfo::getMTime() on file wich was already deleted by other parallel GC.
Solution for this could be some kind of semaphore or at least an additional file_exists() check.