To submit a useful bug report you need to provide as much information as you can. Including
For 4.x version, there are two versions of the lshttpd binary shipped in the LSWS Enterprise package. One is the release build. The other is the debug build. The debug build is not normally used when you run LSWS, but, when debugging, the GDB stack backtrace and core file generated by the debug build are the most useful information you can provide for fixing the bug.
For latest version such as 5.0.x or 5.1.x, the binary installed is debug info enabled by default hence no separate debug build version required. It has no impact for your server performance.
For 4.x version, if there is no debug build of lshttpd binary in your current installation, you can download the related version and arch of debug build from our website. For example:
/usr/local/lsws/admin/misc/lsup.sh -d -f -v <your_lsws_version>
Once you have debug version installed, reproduce your problem and submit a bug report.
For 5.0.x, 5.1.x, you do not need to switch to debug build anymore since the binary installed is debug info enabled by default. It has no impact for your server performance.
By default, core dumping is disabled in LSAPI PHP external applications. To enable it, you need to add an environment variable to your LSPHP external application configuration (WebAdmin console > Configuration > External App > your external application > Environment):
Core dumping is generally disabled by default on Linux. The following guide will lead you through the steps necessary to enable it: How to enable core dump for Linux