Xcode 26.1 RC issue

Question

Created 4d

Replies 5

Boosts 5

Participants 3

I'm seeing a lot of unexpected CPU usage when running the iOS 26.1 simulator. Looks like a "MercuryPosterExtension" is crashing over and over, which then causes the "ReportCrash" process to run, presumably to create the crash report.

Doesn't happen on device, nor on iOS 26.0 simulator. I suspect MercuryPoster is related to wallpaper. I also don't see any wallpaper background in my simulator.

Few lines from the stack trace:

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 libxpc.dylib 0x18011defc _xpc_api_misuse + 88

1 libxpc.dylib 0x18012e16c _xpc_shmem_create_with_prot.cold.1 + 24

2 libxpc.dylib 0x180113a70 _xpc_shmem_create_with_prot + 276

3 MTLSimDriver 0x23795ed48 -[MTLSimDevice newBufferWithLength:options:pointer:copyBytes:deallocator:] + 260

4 MercuryPosterExtension 0x10081d21c 0x100758000 + 807452

13 PosterKit 0x240d003d8 -[PRRenderer scene:willConnectToSession:options:] + 648

14 UIKitCore 0x1856bcf18 +[UIScene _sceneForFBSScene:create:withSession:connectionOptions:] + 956

Boost

Answer 1

RickMaddy OP

4d

I've been seeing the same issue for a while now. I have both Xcode 26.0 and Xcode 26.1 beta 3. Running either causes the same issue as soon as I open an iOS/iPadOS 26.1 simulator.

I only have a missing wallpaper on iPad simulators with iPadOS 26.1. iPhone simulators show the wallpaper. But either causes the CPU spike due to the ReportCrash process.

I can have all of the iOS/iPadOS 26.0 simulators running that I want with no CPU spike. Launch a single iOS/iPadOS 26.1 simulator and in seconds my CPU spikes and stays there. Close that one simulator and everything goes back to normal.

I filed FB20868503

0

Answer 2

jhowlin OP

4d

Good to know it's not just me!

0

Answer 3

RickMaddy OP

3d

@jhowlin Make sure you file a bug report using Feedback Assistant. Apple needs to know that more than one person is having this issue.

0

Answer 4

soapbox OP

2d

I am seeing this too.

0

Answer 5

RickMaddy OP

2d

@soapbox Make sure you file a bug report using Feedback Assistant.

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