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.

Answer 2

I ran across this same error with zero idea of what to do next. I tried the accepted answer and my project didn't have any breakpoints at all.

Turns out I had an observer that I didn't remove and every few times I would push off/on the vc that contained it it would eventually crash with the op's error. I had to enable zombies to figure out which vc was causing the error. I had to manually go through the code line by line to realize I didn't remove the observer. Once I removed it everything worked fine.

// not removing this caused the error
playerItem?.addObserver(self, forKeyPath: #keyPath(AVPlayerItem.status),
                                options: [.old, .new],
                                context: &playerItemContext)

Answer 3

In my case. I'm also using SQLite.swift to create database. The crashing happened when I tried to change a column data type of an existing table in code(which was not in the right way to do it), then inserted a tuple with new data type, then tried to print all the tuple out.

Solution: Delete the .sqlite3 database file you have or delete the table with conflict data type and recreate them all.

Answer 4

In my case the LLDB RPC server consistently crashed every time I ran my app, even after cleaning the build folder and removing and reinstalling Xcode (Version 8.3.3 (8E3004b)) completely.

It turned out that apparently LLDB took objection to a breakpoint I had set, just moving this breakpoint by a line resolved the issue.

Answer 5

Clearly a lot of different causes for this, but for me I was using a DispatchGroup to keep track of multiple async tasks.

I had forgotten to call dispatchGroup.enter() before one of the async tasks (but still calling dispatchGroup.leave() when it finished).

Adding this in fixed the crash for me.

Answer 6

I have found a solution for this, this may not be the perfect but kind a fix my problem.

1. Go to target Build Settings -> Other Swift Flags -> check Debug Values added Remove everything except $(inherited) and -DDEBUG

2. Remove Derived Data

3. Clean and Run