Xcodes exits immediately on launch on macOS 27.0 beta with AttributeGraph precondition failure

[lucas-sesti]

Xcodes exits immediately on launch on macOS 27.0 beta with AttributeGraph precondition failure

Summary

Xcodes 4.0.2 starts on macOS 27.0 beta but exits immediately before showing a usable window. Launching from Finder and from open -a Xcodes both reproduce the issue.

Environment

• Xcodes: 4.0.2, build 37
• Bundle ID: com.xcodesorg.xcodesapp
• App path: /Applications/Xcodes.app
• macOS: 27.0 beta, build 26A5353q
• Darwin: 27.0.0
• Mac: MacBook Pro MacBookPro18,2, Apple M1 Max, 32 GB RAM
• SIP: Enabled
• Xcodes build SDK: macOS 26.5 / Xcode 17F42

Steps to Reproduce

1. Install Xcodes 4.0.2 in /Applications.
2. Run open -a Xcodes or open Xcodes from Finder.

Expected Result

Xcodes opens normally.

Actual Result

The process starts, reaches AppKit/SwiftUI initialization, then exits immediately. No Xcodes crash report is generated under ~/Library/Logs/DiagnosticReports.

Relevant Logs

From Unified Log after running open -a Xcodes:

2026-06-10 12:13:00.570 runningboardd Creating and launching job for: app<application.com.xcodesorg.xcodesapp...>
2026-06-10 12:13:00.579 Xcodes[36556] Retrieve User by ID
2026-06-10 12:13:00.839 Xcodes[36556] [com.apple.attributegraph:error] precondition failure: <private>
2026-06-10 12:13:00.842 launchd service inactive: application.com.xcodesorg.xcodesapp...
2026-06-10 12:13:00.931 runningboardd termination reported by launchd (2, 6, 6)
2026-06-10 12:13:01.013 loginwindow appDeath for com.xcodesorg.xcodesapp with bundle path: /Applications/Xcodes.app

Running the executable directly showed the same pattern:

2026-06-10 12:20:10.184 Xcodes[76857] [com.xcodesorg.xcodesapp:subprocess] Process.run executable: <private>, input: <private>, arguments: <private>
2026-06-10 12:20:10.198 Xcodes[76857] [com.apple.corespotlight:index] Failed to request donation Error Domain=CSIndexErrorDomain Code=-1000
2026-06-10 12:20:10.206 Xcodes[76857] [com.apple.attributegraph:error] precondition failure: <private>
2026-06-10 12:20:10.209 launchservicesd LSExitStatus=0, pid=76857
2026-06-10 12:20:10.215 loginwindow appDeath for com.xcodesorg.xcodesapp

Code Signing / Gatekeeper Diagnostics

codesign reports an invalid signature for both architectures:

$ codesign --verify --strict --verbose=6 /Applications/Xcodes.app
/Applications/Xcodes.app: invalid signature (code or signature have been modified)
In architecture: arm64

$ codesign --verify --strict --verbose=6 --architecture x86_64 /Applications/Xcodes.app/Contents/MacOS/Xcodes
/Applications/Xcodes.app/Contents/MacOS/Xcodes: invalid signature (code or signature have been modified)
In architecture: x86_64

Gatekeeper assessments are disabled on this machine, so spctl still accepts the app:

$ spctl --status
assessments disabled

$ spctl --assess --type execute -vv /Applications/Xcodes.app
/Applications/Xcodes.app: accepted
override=security disabled

Extended attributes:

com.apple.macl:
com.apple.provenance:
com.apple.quarantine: 01c1;6a2918a6;;E3AF5289-CE56-4415-9B24-68705AA7291F

Notes

• No Xcodes crash report was found in ~/Library/Logs/DiagnosticReports.
• Because the local app bundle currently fails code-signature verification, it may be worth confirming with a fresh download/install. The launch failure itself is reproducible and the visible failure point in the log is the AttributeGraph precondition failure during startup on macOS 27.0 beta.