[mistwang]

If you can make lsphp5 dump a core file, it will help.
You need to add LSAPI_ALLOW_CORE_DUMP in lsphp5 env.
http://www.litespeedtech.com/php-litespeed-sapi.html

ulimit -c should be high enough, the user that PHP run as should be able to write to that directory. And use "coreadm" command to manage core dump.