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When an fpm child handles more than one request, zend_signal_startup() will override the saved signal handlers with the internal zend handlers set from the previous request, causing a SIGQUIT signal to result in a core dump rather than gracefully exiting (the expected behaviour).
This is fixed by adding a call to zend_signal_init() after setting the signal handlers in the child. The same technique is used in the apache SAPI module in commit fd5a756 which addresses bug #61083.