Message from debugger: Xcode has killed the LLDB RPC server to allow the debugger to detach from your process. You may need to manually terminate your process.
I keep getting errors when trying to run Xcode projects. The first question was about a code signing issue, and after fixing that, I'm now having this debugging issue. I've never had problems like this before, but when I upgraded to 15.6. 1 via iPhone they started showing up. This happens with every application I try to run.
Can someone explain what this message means? How can I fix this if they have any solutions?
Posted 7 months ago
✅ Best answer:
This happens when the process of attaching the debugger to a new process is too slow and Xcode thinks lldb is stuck. A common reason for remote debugging is if there is no "host-side" copy of the system library loaded into the binary on the phone. Today, iOS applications are very complex, with many shared libraries and a lot of symbols. lldb has to read them because you might want to set breakpoints on any of them.
The debugging protocol used by lldb has the advantage of being ubiquitous, but it was not designed for high-speed data transfer. This can be very slow when lldb has to read all symbol information from the process being debugged.
Xcode solves this by copying the system libraries on the device into cache on the host Mac and putting them where lldb knows to look for them. It has to do this every time it sees a device with a new OS. It sounds like the process is failing.
The cache is stored on the Mac you are debugging:
~/Library/Developer/Xcode/iOS Device Support/<OS Version>
Your 15.6.1 may not have a directory, or it may have a directory but not actually all the files. You can usually fix this by deleting the directory in device support <OS Version>, then unplugging and re-plugging in the device. The next time you run Xcode, you should see some messages about "Preparing the device for debugging", copying these files. If it still doesn't work, it's best to file a bug with Apple BugReporter so we can dig deeper into it.