What is LLDB RPC Server ? When does it crash in Xcode? Why it crashes?

Question

I am getting a message in my debugger:

The LLDB RPC server has crashed. The crash log is located in ~/Library/Logs/DiagnosticReports and has a prefix

Answer 1

In my case: I update to Xcode Version 9.3 (9E145) recently and Xcode execute to the line with breakpoint then I type "po XXX" commend it will show the same message. I try to delete following files

~/Library/Preferences/com.apple.dt.Xcode.plist
~/Library/Caches/com.apple.dt.Xcode

and it solved. not knowing exactly why but worth to try.

remember to backup those files in order to recovered in case any unexpected situation occur.