Php fastcgi crashes if url contains & start_debug = 1

Question

php fastcgi crash if url contains &start_debug=1i get the following error in nginx error log

2016/11/09 12:16:08 [error] 341#0: *72 upstream prematurely closed connection while reading response header from upstream, client: 127.0.0.1, ... request: "GET /?debug_host=127.0.0.1&start_debug=1 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000",

How can I fix this error?

The following error message appears in the / usr / local / etc / php / 5.6 / logs / php-fpm.log log

[09-Nov-2016 12:18:51] WARNING: [pool www] child 2243 exited on signal 11 (SIGSEGV) after 394.275224 seconds from start

If we do not have & start_debug = 1, everything works fine. I add & start_debug = 1 for the Zend debugger.

Thank.