I’m facing an issue where iOS Simulator versions 18.6 and above (including iOS 26.0.1) fail to boot, while older simulators like iOS 18.0 / 18.2 work fine on the same machine. Environment macOS 26.2 (Build 25C56) Xcode 26.0 (Build 17A324) iOS Simulator runtimes: iOS 18.0 – works iOS 18.6 – fails to boot iOS 26.0.1 – fails to boot Error observed Unable to boot the Simulator NSPOSIXErrorDomain Code: 4 (Interrupted system call) Failed to start launchd_sim: could not bind to session, launchd_sim may have crashed or quit responding This happens even when launching the Simulator app directly (without running any app). Steps already tried (no success) Shut down and erased all simulators: xcrun simctl shutdown all xcrun simctl erase all Deleted CoreSimulator data: rm -rf ~/Library/Developer/CoreSimulator killall -9 com.apple.CoreSimulator.CoreSimulatorService Rebooted macOS multiple times Reinstalled simulator runtimes via Xcode → Settings → Platforms Attempted runtime deletion using: xcrun simctl runtime delete (No matching runtime found / runtimes reappear) Verified that legacy runtime path /Library/Developer/CoreSimulator/Profiles/Runtimes no longer exists on macOS 26 (runtimes appear to be managed by AssetRuntime) Observation iOS 18.0 simulator consistently boots iOS 18.6+ and iOS 26.0.1 always fail Issue appears unrelated to project or app code Conclusion / Question This looks like a CoreSimulator / AssetRuntime regression affecting newer simulator runtimes on macOS 26 + Xcode 26. Has anyone else seen this issue? Is there a known workaround, or is this fixed in an upcoming Xcode/macOS update?