Description:
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When I use php-fpm together with the PHP7 alpha1 on an nginx server I get a 502 Bad Gateway from nginx.

In the nginx log I see this error:

[error] 1889#0: *4 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: xxx.xxx.xxx.20, server: localhost, request: "GET /info.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php70-fpm.sock:", host: "xxx.xxx.xxx.21"

If I look into the log of the php-fpm service I see this:

WARNING: pid 2582, fpm_request_check_timed_out(), line 277: [pool www0] child 2813, script '' (request: " ") execution timed out (120.018160 sec), terminating

If I run the same configuration with PHP 5.5.x and 5.6.x everything works fine. Just with the 7.0 alpha 1 this problem happens. PHP 7 command line SAPI works fine.

Test script:
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Nginx fastcgi_params I use:

fastcgi_param   QUERY_STRING            $query_string;
fastcgi_param   REQUEST_METHOD          $request_method;
fastcgi_param   CONTENT_TYPE            $content_type;
fastcgi_param   CONTENT_LENGTH          $content_length;

fastcgi_param   SCRIPT_FILENAME         $document_root$fastcgi_script_name;
fastcgi_param   SCRIPT_NAME             $fastcgi_script_name;
fastcgi_param   PATH_INFO               $fastcgi_script_name;
fastcgi_param   REQUEST_URI             $request_uri;
fastcgi_param   DOCUMENT_URI            $document_uri;
fastcgi_param   DOCUMENT_ROOT           $document_root;
fastcgi_param   SERVER_PROTOCOL         $server_protocol;

fastcgi_param   GATEWAY_INTERFACE       CGI/1.1;
fastcgi_param   SERVER_SOFTWARE         nginx/$nginx_version;

fastcgi_param   REMOTE_ADDR             $remote_addr;
fastcgi_param   REMOTE_PORT             $remote_port;
fastcgi_param   SERVER_ADDR             $server_addr;
fastcgi_param   SERVER_PORT             $server_port;
fastcgi_param   SERVER_NAME             $server_name;

fastcgi_param   HTTPS                   $https;

# PHP only, required if PHP was built with --enable-force-cgi-redirect
fastcgi_param   REDIRECT_STATUS         200;

Expected result:
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php-fpm should get a script name to execute.

Actual result:
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php-fpm does not get a script name to execute and times out.