Thank you for the bug report.
Yes, looks like it is. SPARC is picky about alignments. ;-)
Can you please send us the core file or the back trace of call stack? We have not been able to reproduce it in our lab.
Core file should be under /tmp/lshttpd/ directory.
You may have to use "coreadm" command to enable core dump for a setuid process, or just start the server process with the non-privilege user specified during installation.
Thank you very much!