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

I found the solution to this issue. I don't know is this correct or not, but this solution is work for me. what I did is Actually I connected two devices to my mac mini, in one device I run the app and get the above error in my console. Then I removed one device and tried, this time I didn't get any error in my console its worked fine. I think you guys won't believe this, I tried Almost 3 time with two devices and one device its only work for one device

Answer 2

This error occurs for different reasons and the main one is when you add a watch app later to your project where Xcode adds an extra build target to scheme. click on scheme section in right side of "run/stop buttons" then hit on edit scheme, hit on Build section which is the first one, There you see 2 targets one has 2 sub targets which includes watch app and watch extension in it and the other one has no sub targets and it is a watch app target.

Solution is simple delete the watch app target which has no sub targets and run the app again.

Answer 3

If workspace has lots of breakpoint then it will happen, So try to remove all the break point and see the magic.

Answer 4

For me, I had an expression in my watch list that it was barfing on. When looking at the crash logs in Console, there was something like this on the reported crashed thread which gave it away:

lldb_private::EvaluateExpressionOptions const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, lldb_private::ValueObject*) + 619
17  com.apple.LLDB.framework        0x0000000102855f18 lldb::SBFrame::**EvaluateExpression**(char const*, lldb::SBExpressionOptions const&) + 696
18  lldb-rpc-server                 0x00000001025e72e9 rpc_server::_ZN4lldb7SBFrame18EvaluateExpressionEPKcRKNS_19SBExpressionOptionsE::HandleRPCCall(rpc_common::Connection&, rpc_common::RPCStream&, rpc_common::RPCStream&) + 169
19  lldb-rpc-server                 0x00000001025f8ce1 rpc_common::Connection::PrivateHandleRPCPacket(rpc_common::RPCPacket&, rpc_common::RPCPacket&, bool&) + 1553
20  lldb-rpc-server                 0x00000001025fc36d Packets::ProcessPackets() + 1005
21  lldb-rpc-server                 0x00000001025fbe96 Packets::ReadThread() + 214
22  lldb-rpc-server                 0x00000001025fbdb9 Packets::RunReadThread(void*) + 9
23  libsystem_pthread.dylib         0x00007fff6a586109 _pthread_start + 148
24  libsystem_pthread.dylib         0x00007fff6a581b8b thread_start + 15

Answer 5

I had the same problem and fixed it after I deleted some of the breakpoints. Not sure why this happen at all, but at least you can remove breakpoints and use some NSLog() or print() if you are in Swift and debug with the help of those. Good luck!

Answer 6

Make sure you are not running the app in release mode, if it is in release mode then change it to debug.