If you see a Segmentation fault: 11 error or something similar, you can start the server through the lldb debugger to find out the reason.

lldb ./.build/debug/Run
process launch serve
# print backtrace
bt
# look up a symbol
image lookup -a 0x1000 

Start the debugger and launch the serve command. Then try to repeat the steps that caused the crash. You can print out the backtrace using the bt command, this can help you to identify the problem.