LLDB RPC Crash in Xcode Playgrounds

Question

Created Apr ’25

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Hi, upgraded to Xcode Version 16.3 (16E140) today and now Playground can't execute JSON decoding. The code below is taken from Apple's own JSONDecoder example:

struct GroceryProduct: Codable {
    var name: String
    var points: Int
    var description: String?
}

let json = """
{
    "name": "Durian",
    "points": 600,
    "description": "A fruit with a distinctive scent."
}
""".data(using: .utf8)!

let decoder = JSONDecoder()
let product = try decoder.decode(GroceryProduct.self, from: json)

print(product.name) // Prints "Durian"

This use to work in the previous Xcode version. Now I get this error:

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

This file doesn't exist in the location. I've restarted Xcode and the Mac, same error.

Any thoughts?

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Answer 1

ChrSngular OP

Apr ’25

Same error here with encode/decode lines, if I comment those lines, the code runs.

I have ask to my colleagues to try this code and some can run, others throw that error. I don't know if maybe Sequoia 15.4 and 16.3/.2 has some in this bug, but the majority where fails has this config.

Is kind of annoying we cannot use playground.

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