I’m seeing a crash when running XCTest on iOS 15.2 Simulators with Xcode 26.4. The test bundle never starts. xctest crashes before establishing the XCTest connection.
This appears to be a regression from Xcode 26.2. The same test flow worked with Xcode 26.2, but crashes with Xcode 26.4.
This does not appear to be caused by my app or package code. I can reproduce it with a minimal Swift Package that only imports Foundation and has one XCTest case using
URLRequest.httpMethod.
Environment:
Xcode with failure: 26.4
Xcode that worked: 26.2
macOS: 26.2
Destinations tested:
iPhone SE (2nd generation), iOS 15.2 Simulator
iPad mini (6th generation), iOS 15.2 Simulator
Test command: xcodebuild test
Swift Package deployment target: iOS 15.2
Swift tools version: 6.1
Minimal reproduction package:
Package.swift
// swift-tools-version:6.1
import PackageDescription
let package = Package(
name: "FoundationOnlyRepro",
platforms: [.iOS("15.2")],
products: [
.library(
name: "FoundationOnlyRepro",
targets: ["FoundationOnlyRepro"]
)
],
targets: [
.target(name: "FoundationOnlyRepro"),
.testTarget(
name: "FoundationOnlyReproTests",
dependencies: ["FoundationOnlyRepro"]
)
],
swiftLanguageModes: [.v6]
)
Sources/FoundationOnlyRepro/FoundationOnlyRepro.swift
import Foundation
public struct FoundationOnlyRepro {
public init() {}
public func makeRequest() -> URLRequest {
var request = URLRequest(url: URL(string: "https://example.invalid")!)
request.httpMethod = "GET"
return request
}
}
Tests/FoundationOnlyReproTests/FoundationOnlyReproTests.swift
import XCTest
import Foundation
@testable import FoundationOnlyRepro
final class FoundationOnlyReproTests: XCTestCase {
func testURLRequestHTTPMethod() {
let request = FoundationOnlyRepro().makeRequest()
XCTAssertEqual(request.httpMethod, "GET")
}
}
Command used:
xcodebuild test \
-scheme FoundationOnlyRepro \
-destination 'platform=iOS Simulator,name=iPhone SE (2nd generation),OS=15.2' \
-derivedDataPath /tmp/rdp-dd \
-quiet
The same kind of crash also occurs when using an iPad mini (6th generation) iOS 15.2 Simulator destination.
Result:
Testing failed:
xctest (...) encountered an error (Early unexpected exit, operation never finished bootstrapping - no restart will be attempted. (Underlying Error: Test crashed with
signal abrt before establishing connection.))
** TEST FAILED **
The diagnostic stderr shows:
dyld[28688]: Symbol not found: _$s10Foundation10URLRequestV10httpMethodSSSgvs
Referenced from: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/Library/PrivateFrameworks/ResultDataPublisher.framework/
ResultDataPublisher
Expected in: /Library/Developer/CoreSimulator/Profiles/Runtimes/iOS
15.2.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/Foundation.framework/Foundation
Demangling the missing symbol:
xcrun swift-demangle '_$s10Foundation10URLRequestV10httpMethodSSSgvs'
Output:
Foundation.URLRequest.httpMethod.setter : Swift.String?
I also checked the iOS 15.2 simulator runtime. The symbol appears to exist in:
/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 15.2.simruntime/Contents/Resources/RuntimeRoot/usr/lib/swift/libswiftFoundation.dylib
but ResultDataPublisher.framework appears to be resolving it from: .../System/Library/Frameworks/Foundation.framework/Foundation
This suggests the crash is in Xcode’s XCTest/result publishing infrastructure, not in the app/test bundle.
Questions:
Is Xcode 26.4 + iOS 15.2 Simulator + xcodebuild test expected to be supported?
Is there a supported workaround to disable or avoid ResultDataPublisher.framework for command-line XCTest runs?
