Description of problem:
httpd configured with long URI ScriptAliasMatch directive causes child process to crash.

Version-Release number of selected component (if applicable):
httpd-2.4.6-88.el7.x86_64 

How reproducible:
Whenever a long URI is called.

Steps to Reproduce:
Prepare test script:
~~~
cat <<EOF > /var/www/cgi-bin/hello.cgi
#!/usr/bin/perl
print "Content-type: text/html\n\n";
print "Hello, World!";
EOF
~~~

Set file permissions:
~~~
chmod 755 /var/www/cgi-bin/hello.cgi
~~~

Add ScriptAliasMatch configuration to httpd:
~~~
ScriptAliasMatch ^/test/ /var/www/cgi-bin/hello.cgi
~~~

grant cgi-bin Directory:
~~~
<Directory "/var/www/cgi-bin">
    AllowOverride None
    Options None
    Require all granted
</Directory>
~~~

Restart httpd:
~~~
systemctl restart httpd.service
~~~

make a long request:
~~~
curl -v http://localhost/test/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
* About to connect() to localhost port 80 (#0)
*   Trying 127.0.0.1...
* Connected to localhost (127.0.0.1) port 80 (#0)
> GET /test/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa HTTP/1.1
> User-Agent: curl/7.29.0
> Host: localhost
> Accept: */*
> 
* Empty reply from server
* Connection #0 to host localhost left intact
curl: (52) Empty reply from server
~~~

/var/log/httpd/error_log:
~~~
[crit] Memory allocation failed, aborting process.
[] [core:notice] [pid 17335:tid 140700752099456] AH00052: child pid 17567 exit signal Aborted (6)
~~~


Actual results:
httpd child process crashes.


Expected results:
~~~
curl -v http://localhost/test/aaaaaa
* About to connect() to localhost port 80 (#0)
*   Trying 127.0.0.1...
* Connected to localhost (127.0.0.1) port 80 (#0)
> GET /test/aaaaaa HTTP/1.1
> User-Agent: curl/7.29.0
> Host: localhost
> Accept: */*
> 
< HTTP/1.1 200 OK
< Date: 
< Server: Apache/2.4.6 (Red Hat Enterprise Linux)
< Transfer-Encoding: chunked
< Content-Type: text/html; charset=UTF-8
< 
* Connection #0 to host localhost left intact
Hello, World!
~~~


Additional info:
Workaround: handle the long URI with rewrite rules. Example:

~~~
ScriptAliasMatch /script/ /var/www/html/wms/script/hello.cgi

RewriteEngine On
RewriteRule ^/test/ /script/ [NC,PT]
~~~

~~~
curl -v http://localhost/test/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
* About to connect() to localhost port 80 (#0)
*   Trying 127.0.0.1...
* Connected to localhost (127.0.0.1) port 80 (#0)
> GET /test/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa HTTP/1.1
> User-Agent: curl/7.29.0
> Host: localhost
> Accept: */*
> 
< HTTP/1.1 200 OK
< Date: 
< Server: Apache/2.4.6 (Red Hat Enterprise Linux)
< Transfer-Encoding: chunked
< Content-Type: text/html; charset=UTF-8
< 
* Connection #0 to host localhost left intact
Hello, World!
~~~