Xcode 26 Crashes on Launching App After macOS + Xcode Update (M3 Mac)

Question

hajhouj OP

Created Sep ’25

Replies 9

Boosts 2

Participants 4

Hi everyone,

After updating my Mac and Xcode to 26, I’m running into a consistent crash whenever I try to launch an app from Xcode.

Environment:

Mac: Apple Silicon M3
macOS: 26.0 (25A354)
Xcode: 26.0.1 (17A400)

Issue:

When I press Run on any project (including new, empty projects), Xcode immediately crashes. This started only after updating to the latest macOS and Xcode.

Crash details:

The crash log shows:

Application Specific Signatures:
___localError
Thread 0 crashed inside -[IDEScheme _executionOperationForSchemeOperationParameters:...] from IDEFoundation/IDEKit.

I also noticed background threads calling DVTPortal (developer portal requests) right before the crash.

What I’ve tried so far:

Cleared DerivedData, ModuleCache.noindex, and Xcode caches.
Signed out/in of my Apple ID in Xcode.
Recreated project schemes.
Verified provisioning profiles.
Reinstalled Xcode 26.

Unfortunately, the crash still happens. Question: Is this a known issue with Xcode 26 on Apple Silicon (M3)? Has anyone seen a workaround? Any guidance would be greatly appreciated — I can’t currently launch apps in Xcode at all. Thanks!

Boost

Answer 1

xpl0re3 OP

Sep ’25

Hi there! Can you please file a bug report for this issue through Feedback Assistant? Make sure to attach a sysdiagnose so that we can investigate on our side. Once you have filed it, please update this post with the FB number.

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Answer 2

hajhouj OP

Sep ’25

I sent the bug report, FB number : FB20349158

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Answer 3

hajhouj OP

Sep ’25

I sent a bug report through the Feedback Assistant: FB20349158

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Answer 4

hajhouj OP

Sep ’25

FB20349158

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Answer 5

hajhouj OP

Sep ’25

any workaround to bypass the issue, I am on an urgent project, and I don't what to do actually?

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Answer 6

DTS Engineer OP

Apple

Sep ’25

You can see the status of your feedback in Feedback Assistant. There, you can track if the report is still being investigated, has a potential identifiable fix, or has been resolved in another way. The status appears beside the label "Resolution." We're unable to share any updates on specific reports on the forums.

For more details on when you'll see updates to your report, please see What to expect after submission.

Albert Pascual   Worldwide Developer Relations.

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Answer 7

hajhouj OP

Nov ’25

I sent feedback on September 23 about the Xcode crash when trying to launch an app. Can you update me on the status or suggest a workaround?

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Answer 8

Product Manager OP

Apple

Nov ’25

Could you please update to the latest macOS and Xcode and see if you can reproduce the crash? Thanks

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Answer 9

hajhouj OP

3w

I update to the latest Xcode : Version 26.1.1 (17B100) Toolchain: Swift 6.2 Release 2025-09-11 (a)

and MacOS to the latest : 26.1 (25B78)

and still have the same crash problem, I give the crash report to an AI to summarize it :

Primary Issue

Assertion Failure in Scheme Execution: The crash occurred during scheme execution operations, specifically when Xcode was trying to create an execution operation for running a scheme.

Key Technical Details

Crash Location

Thread 0 (main thread) crashed with SIGABRT (Abort trap: 6)
Trigger: Assertion failure in IDEScheme class
Specific Method: -[IDEScheme _executionOperationForSchemeOperationParameters:build:onlyBuild:buildParameters:title:buildLog:dontActuallyRunCommands:restorePersistedBuildResults:deviceAvailableChecker:error:actionCallbackBlock:]

Crash Sequence

Assertion triggered in IDEScheme operations
Assertion handler called abort()
Main thread terminated with abort signal

The crash appears to be an internal Xcode assertion triggered by invalid state during scheme execution preparation, likely related to project configuration or build system state corruption.

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