lighttpd forum lighty > lighttpd Signal 6 when subversion checkout large repo

I use mod_proxy to proxy my subversion requests. Just like
http://trac.lighttpd.net/trac/wiki/ApacheSubversionRecipe

When I use tortoiseSVN to check out repo, which contains large files
in it ( > 1G), lighttpd will die without any message in error.log

No error message found except

pid 5361 (lighttpd), uid 80: exited on signal 6

in kernel dmesg.

Nothing record even when I use proxy.debug = 1.

$HTTP["host"] =~ "myhost" {
        $HTTP["url"] =~ "^/repos" {
                proxy.debug = 1
                proxy.server = (
                        "" => (("host" => "127.0.0.1", "port" => 8080))
                )
        }
}

When I directly connect to port 8080, the action (checkout) will 
success.


I believe this problem should be the same as 
http://trac.lighttpd.net/trac/ticket/663