Xcode 26.x Frequently Freezes During Breakpoint Debugging with Simulator

Question

Created Nov ’25

Replies 5

Boosts 2

Participants 4

When I use Xcode 26 (0.1, 1) for debugging and hit a breakpoint, using "step over" causes the debugger to freeze at a random line of code. Clicking "Pause program execution" indicates that the line is being executed, but the breakpoint never exits, seemingly causing a freeze. The application on the simulator also becomes unresponsive. However, when I do not use breakpoints, my program runs smoothly, and debugging on a physical device does not cause any freezes. This issue only occurs with the simulator. I am using Xcode on Apple Silicon, and due to some third-party SDKs that depend on Rosetta, our app can only run on the Rosetta simulator. We did not encounter this issue when using Xcode 16.x for simulator debugging. The current situation with Xcode 26.x significantly reduces our development efficiency. What could be causing this, and is there a solution?

Answered by DTS Engineer in 884882022

@Z_L_Z, @G-null, I want to be clear about what’s going upthread. The folks having this issue are using Rosetta to run the simulator. In my earlier post I made it clear that that’s not a supported configuration. So:

If you’re also using Rosetta to run the simulator, I recommend that you stop doing that and see if the problem persists.
If you’re not using Rosetta to run the simulator, I recommend that you start a new thread here on the forums with the details of your issue. That’ll ensure that folks reading your thread don’t get distracted by the Rosetta history in this thread.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

Boost

Answer 1

tczhu OP

Nov ’25

Universal Simulator

0

Answer 2

DTS Engineer OP

Apple

Nov ’25

our app can only run on the Rosetta simulator

I want to make a couple of things clear:

This isn’t a supported configuration. Honestly, I’ve always been surprised that this works at all.
Apple has announce a timeline for the removal of general support for Rosetta. For the details, see the Important box at the top of About the Rosetta translation environment.

I encourage you to work with your third-party SDK vendor to resolve this roadblock sooner rather than later.

As to your immediate issue, if you create a small test project and run it natively in simulator, does it have the same problem?

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

0

Answer 3

Z_L_Z OP

Feb ’26

@tczhu Hi, May I ask how you finally solved this problem? Thanks.

0

Answer 4

G-null OP

2d

@tczhu I'm having the same problem. Is there a solution?

0

Answer 5

DTS Engineer OP

Apple

2d

Recommended

@Z_L_Z, @G-null, I want to be clear about what’s going upthread. The folks having this issue are using Rosetta to run the simulator. In my earlier post I made it clear that that’s not a supported configuration. So:

If you’re also using Rosetta to run the simulator, I recommend that you stop doing that and see if the problem persists.
If you’re not using Rosetta to run the simulator, I recommend that you start a new thread here on the forums with the details of your issue. That’ll ensure that folks reading your thread don’t get distracted by the Rosetta history in this thread.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

0