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Reply to How to debug a Launch Daemon that requires an App Group provisioning profile for XPC communication

[quote='821027021, Pavel, /thread/821027, /profile/Pavel'] For debugging purposes, I am trying to run the daemon's executable directly from the terminal [/quote] This won’t work. For your launchd daemon to work correctly, it must be started by launchd. I explain why that’s the case in XPC and App-to-App Communication. My general advice for debugging a launchd daemon is: Structure your code so that you can do most of your debugging in unit tests, rather than in your daemon. That’ll make your life much easier. To unit test your XPC code, use the technique in TN3113 Testing and debugging XPC code with an anonymous listener. To debug integration issues: Using LLDB’s --wait-for option to attach to the daemon shortly after it starts. There’s a similar option in Xcode, under Debug > Attach to Process by PID or Name. Or if you absolutely need to debug from the first instruction, add the WaitForDebugger property to your launchd property list. See the launchd.plist man page for details. [quote='821027021, P

App & System Services Processes & Concurrency

Reply to Sporadic crash in xzm_main_malloc_zone_init_range_groups when spawning large binaries (macOS 26.3.1)

The 3 in that error is KERN_NO_SPACE, which is a pretty clear indication that the system memory allocator asked for address space and the kernel refused to give it. However, given all the constraints you’ve described, it’s not at all clear why that would be. Weirdly, the code that traps this way is not on the main branch of the Darwin open source, but I found a copy in the rel/libmalloc-792 branch [1]. Now, I don’t have time today to study that code in depth, but I figured you’d find it interesting (-: AFAICT it tries to allocate address space by using mach_vm_map to map MEMORY_OBJECT_NULL, specifying a start that’s after 16 GiB, such that it fits within 64 GiB, with a randomly applied offset. That random bit probably explains why this shows up so infrequently. It’s hard to say why this is failing. You might be able to learn more by running vmmap against the dying process. It’d also be interested to know what address was passed to mach_vm_map (with reference to the source, that’s the ptr_addr value),

App & System Services Core OS

Reply to Need MetricKit Implementation details for MacOS background Application, mainly for

MetricKit definitely works on macOS. I’m not sure about how it interacts with Network Extension processes. Let’s start with some basics: Is your NE provider packaged as an app extension or a system extension? If it’s an sysex, are you distributing it directly? Or on the Mac App Store. TN3134 Network Extension provider deployment talks more about NE provider packaging and deployment options. Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = eskimo + 1 + @ + apple.com

Developer Tools & Services General

Reply to Apps cannot launch on iOS 9-12 devices after recent build - "The process failed to exec"

The same codebase previously ran fine when uploaded to TestFlight, but after re-uploading it now fails to launch on iOS 12, even though neither the code nor the Xcode version has changed. I suspect a recent change in the App Store Connect backend processing pipeline is the cause.

App Store Distribution & Marketing App Store Connect

Unable to invalidate interval: no data source available error when fetching steps using HKStatisticsCollectionQuery

While attempting to read a user’s daily step history spanning backward to the last 7 days, a small but consistent subset of users encounter Error Code 3 with the underlying error description: Error Code 3 Unable to invalidate interval: no data source available. When this error occurs, we are entirely unable to read their step history. We have received ~10 direct user reports of this within the last couple of weeks.

App & System Services Health & Fitness HealthKit

193

Reply to System-wide deadlock in removexattr from revisiond / APFS

A quick test shows it uses the xattr-specific ES events. Not definitive, and may differ on some systems, but this was one of the affected devices. ES_EVENT_TYPE_NOTIFY_DELETEEXTATTR: process=/System/Applications/TextEdit.app/Contents/MacOS/TextEdit path=/Users/matt.slot/Library/Containers/com.apple.TextEdit/Data/tmp/TemporaryItems/NSIRD_TextEdit_ihoZLx/21B97262-CCCD-4DE3-929D-DC322367AC80.rtf xattr=com.apple.genstore.origdisplayname ES_EVENT_TYPE_NOTIFY_DELETEEXTATTR: process=/System/Applications/TextEdit.app/Contents/MacOS/TextEdit path=/Users/matt.slot/Library/Containers/com.apple.TextEdit/Data/tmp/TemporaryItems/NSIRD_TextEdit_ihoZLx/21B97262-CCCD-4DE3-929D-DC322367AC80.rtf xattr=com.apple.genstore.info ES_EVENT_TYPE_NOTIFY_DELETEEXTATTR: process=/System/Applications/TextEdit.app/Contents/MacOS/TextEdit path=/Users/matt.slot/Library/Containers/com.apple.TextEdit/Data/tmp/TemporaryItems/NSIRD_TextEdit_ihoZLx/21B97262-CCCD-4DE3-929D-DC322367AC80.rtf xattr=com.apple.genstore.gen_opt

App & System Services Core OS

Background Assets - Apple Hosted - iOS26

I've followed the setup process to get Apple Hosted Background Assets configured for my project. (https://developer.apple.com/documentation/backgroundassets/downloading-apple-hosted-asset-packs) But when I build and run the app I get the following error... BackgroundAssets/AssetPackManager.swift:174: Fatal error: The process lacks a team ID. I've checked the Signing->Team for both targets and they both have my Team associated. Any help or advice would be appreciated...

App Store Distribution & Marketing General Background Assets

755

Background Assets: Second and subsequent download cancellations fail (iOS 26.0–26.3 RC)

Summary I'm using Background Assets to download Apple-hosted Asset Packs(downloadPolicy = onDemand). The first download cancellation succeeds, but on the second and subsequent downloads, progress.cancel() fails to work and the download completes to the end. Environment iOS 26.0 – 26.3 RC (all produce the same result) Xcode Version 26.2 (17C52) Using Apple-hosted Asset Packs Steps to Reproduce Start downloading an Asset Pack Call progress.cancel() during download → Succeeds Start downloading the same Asset Pack again Call progress.cancel() during download → Fails (download completes to the end) Observed Error Logs After 1st cancellation: A download with the ID X-XXXXXXXX-XXX failed: Error Domain=NSURLErrorDomain Code=-999 cancelled ↑ This is expected (cancellation succeeded) The fact that version 0 of the asset pack with the ID X-XXXXXX-XXX finished being downloaded couldn't be reported: Error Domain=NSCocoaErrorDomain Code=3851 Property list invalid for format: 200 (property lists cannot contain objects of ty

App & System Services General Background Assets

130

Reply to Apple watch Xcode pairing & connection issues

You can also kill it by sudo pkill -9 remotepairingd If you encounter an instance where you actually find this necessary, please file a Feedback Assistant Report which includes a devicectl diagnose (and separate mac / phone / watch sysdiagnoses if they're not all collected by it). There are no known issues for which this step should be necessary, so if there are issues, we want to know about them. make sure NOT to un-pair your device If you un-pair or you accidentally tap the button to not trust, the only way to get the prompt to appear again is by physically re-connecting the phone. watch is ON throughout the connecting process Yes, and it needs to remain unlocked throughout the DDI mounting process as well. If the device locks before the DDI mounting completes, you will need to re-attempt mounting the DDI. --Jeremy jeremyhu at apple dot com

Developer Tools & Services Xcode

Reply to Different app behavior when running on device from Xcode

Thank you @Tomato and @DTS Engineer ! The purpose of my app is to provide a notification mechanism when there are drastic air quality changes. To accomplish this, I have an async function that makes a GET request to an air quality sensor (using UrlSession), decode the payload, and then do comparisons with previous readings. If the readings have changed drastically, an UNMutableNotificationContent() is scheduled. Currently, my async function is called from within a repeating scheduled timer so that I can poll my sensor every minute: Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { _ in timerVal -= 1 if timerVal == 0 { timerVal = startVal getAQI() } } This all works just fine (including when the app is in the background) ONLY when I run the app from Build and Run in Xcode on my dev iPhone as the destination. I've left the app running this way for hours in the background and with the phone locked and it works great! However, when I try to run the app purely from the app shortcut on my iPhone

Community Apple Developers

Exploring Secure Enclave–backed biometric authorization between macOS and iPhone using public APIs (FaceBridge prototype)

Hi everyone, I’ve been working on an experimental prototype called FaceBridge that explores whether Secure Enclave–backed biometric authorization can be delegated between macOS and iPhone using only public Apple APIs. The goal of the project was to better understand the architectural boundaries of cross-device trust and approval flows that resemble Apple’s built-in Touch ID / Continuity authorization experiences. FaceBridge implements a local authorization pipeline where: macOS generates a signed authorization request the request is delivered to a trusted nearby iPhone over BLE / Network framework the iPhone verifies sender identity Face ID approval is requested using LocalAuthentication the iPhone signs the approval response using Secure Enclave–backed keys macOS validates the response and unlocks a protected action Security properties currently implemented: • Secure Enclave–backed signing identities per device • cryptographic device pairing and trust persistence • replay protectio

Privacy & Security General Face ID Security Core MIDI DeviceDiscoveryUI

Installation of XCode CLT on Tahoe 26.1

I am unable to install due to the following error: can't install the software because it is not currently available from the software update server Mac OS: Tahoe 26.1 CLI: Iterm2 Command : xcode-select --install Output: Command transitions to a GUI installer and attempts to download but fails with the attached error. As a result I am unable to proceed with installing Homebrew from CLI or downloaded pkg

Developer Tools & Services Xcode

Reply to Different app behavior when running on device from Xcode

Thank you for your post @briggr1 . The information provided by @Tomato is highly valuable, is your intention is to create a testing application that sends requests every x minutes. In that case, please clarify your specific requirements. If the application is intended to run in the background, you may consider disabling that feature within the app’s settings. Is this application intended for macOS or iOS? Are you using iOS as standard iOS lifecycle. Is the app going to the background if the user swipes to the home screen, iOS gives your app a few seconds to finish what it's doing, and then completely suspends it to save battery. Any Timer, DispatchQueue, or standard network calls you have running will freeze immediately. You can ask iOS for up to ~30 seconds of extra time to finish the task. Use UIApplication.shared.beginBackgroundTask(expirationHandler:). Once the task finishes, you must call endBackgroundTask, or iOS will forcefully kill your app. In macOS, to prevent this, you use the ProcessInfo

Community Apple Developers

My macOS app is unable to read a Managed Preferences plist unless the App Sandbox is disabled. Is there any solution to read the MDM plist file while the sandbox is still enabled?

I created two sample apps — one sandboxed and one non‑sandboxed. I tested reading Managed Preferences using bash commands, CFPreferencesCopyValue for a domain, and defaults read. Everything works correctly only when the sandbox is disabled in the entitlements. When the sandbox is enabled, I’m unable to read values from /Library/Managed Preferences/. Is there any supported way for a sandboxed macOS app to read an MDM-delivered preference plist under /Library/Managed Preferences/? Any guidance on the correct and Apple‑supported method would be appreciated.

App & System Services Core OS Files and Storage Device Management App Sandbox

192

Reply to Crashes occur on iOS 26.4

Part 2: No, not really. Memory exceptions (what a seg fault is) happen because you’re accessing memory that you either never allocated or have already freed, neither of which will happen due to direct lack of memory. Keep in mind that your app can't really run out of memory in the way you're describing. SO, the issue here is that the term memory is commonly used to describe two separate, but distinct, concepts: How much RAM your process is using. How much address space your process has been given by the system. The important thing to understand here is that those two factors are somewhat independent of each other. In simple terms, address space is what you actually use when you call “malloc, but RAM usage doesn't change until you actually touch the memory you've malloc'd. Similarly, the question here: is it possible that memory usage has increased significantly in iOS 26.4 compared to previous OS versions? ...doesn't really make sense in the context of address space. Real RAM usage changes c

App & System Services Core OS