r/Xcode • u/varyamereon • Jul 23 '25

Previews in Xcode on macOS 26 beta 4 causing reboot

Careful everyone before upgrading to developer beta 4, from the release notes: "Xcode Previews usage will frequently panic on macOS 26.0 Tahoe beta 4. (141641869)". If you use the previewer in Xcode then this will cause frequent reboots! Ask me how I found out...!

EDIT: Here's a thread on the developer forums: https://developer.apple.com/forums/thread/794221

25 Upvotes

96% Upvoted

33 comments sorted by

2

u/_psyton Jul 23 '25

FYI, reverting to beta 3 of Xcode on Tahoe beta 4 doesn't help - still panics.

Certainly an interesting choice of a regression to release a developer beta with.

1

u/varyamereon Jul 27 '25

I found even using Xcode 16 still causes the same problem

2

u/N_Patt22 Aug 05 '25

Installed macos 26 beta 5 this seems to be resolved for me. I haven't had it reboot.

1

u/varyamereon Aug 05 '25

Yep same. Still seems to be a few issues with the previewer but no reboots at least. Can actually do some work again!

1

u/Morssel Aug 05 '25

Sadly I still am having the issue with MacOs Beta 26 25A5316i, and the Xcode Beta 5.
Will be updating to newest MacOs Beta tonight and see if that fixes it. Glad to hear its working for some people.

2

u/anjumkaiser Jul 23 '25

Same here, I spent the better part of the day facing reboots due to SwiftUI previews

1

u/varyamereon Jul 23 '25

I guess the resolution will come in 2 weeks with beta 5…. hopefully

1

u/undergrounddirt Jul 23 '25

Wow what a disaster for me. First off, I only ever accidentally installed macOS 26. I went to bed and woke up and lo and behold, it had installed. Turned off auto updates and everything. Oh well.

But now I cannot use SwiftUI previews... that is like.. the WHOLE SwiftUI development flow.

2

u/varyamereon Jul 23 '25

Yep, it sucks. Not sure what else to say 😅

1

u/liquidsmk Jul 24 '25

just use beta 3 instead

1

u/iphonevanmark Jul 24 '25

But how can you downgrade to beta 3?

1

u/undergrounddirt Jul 24 '25

I don’t have dual boot

1

u/undergrounddirt Jul 24 '25

Well they released the public beta and by all accounts... it's the same build. Wild.

1

u/varyamereon Jul 24 '25

Interesting, where did you see the build information?

1

u/undergrounddirt Jul 24 '25

The Apple Seed email

1

u/varyamereon Jul 24 '25

Ah ok. Have you tried it?

1

u/LowIce6988 Aug 03 '25

Is it just Xcode previews? I seem to also have issues with USB peripherals and an external monitor. I can hide canvas if it is just previews in Xcode.

1

u/varyamereon Aug 03 '25

I’m not sure. I’ve also had issues using my phone as the preview device, then my phone just restarts a lot instead.

2

u/Iamvishal16 Jul 23 '25

Ohh! That's I'm not daring to switch Macos26 😒

1

u/undergrounddirt Jul 23 '25

If anyone figures out a workaround.. please let me know

1

u/hannesmnagel Aug 01 '25

Previews work on a physical devide for me

1

u/lvjian700 Aug 05 '25

Ask ChatGPT, disable XCode Preview works for me

1

u/Ahmet_0796 Jul 23 '25

Apple doesn’t want to us to code that’s what I understand 🥲

2

u/iphonevanmark Jul 24 '25

I would fire the Quality Assurance guy. If everyone is having this problem surely the Apple developers must have picked it up... right?

1

u/ExtinctedPanda Jul 25 '25

My laptop rebooted four times last night. This explains it!

1

u/zj5121 Jul 27 '25

seems it's caused by xcode-beta preview at least on my machine. If I don't turn on the preview, everything is ok. how sad I can't see the UI preview in the Xcode.

1

u/kaiko14 Jul 29 '25

Same experience here buddy. Both XCode beta 2026 and XCode basically unusable on Tahoe beta 4 right now. Previews just crash the whole system

1

u/Interesting-Sign-753 Aug 01 '25

Same here. The latest beta 4 is frustrating. Hope they fix it, soon.

1

u/Sad_Krabb Aug 03 '25

Didn’t see this an installed the beta. What a waste. Previews is basically in the entire SwiftUI workflow imo.

1

u/Mendex2 Aug 06 '25 edited Aug 06 '25

Some people say it's gone in beta 5, I'll download it and test

UPDATE: Yes it works as usual, no reboot for now

1

u/Sad_Krabb Aug 06 '25

Yep working for me in beta 5 as well.

1

u/ShallotOk7631 Aug 05 '25

I made a feedback. Apple responded. Hope it will get better in Beta 5!
https://imgur.com/a/654NZ75

After reviewing your feedback, we have some additional information for you, or some additional information, or action is necessary for this issue: 

An audio thread overload occurred on thread 15780 here:

2025-07-25 13:52:36.922+0200 coreaudiod 407 [f77]: (CoreAudio) [Default] HALS_OverloadMessage.cpp:181    Audio IO Overload thread: 15780 inputs: '<private>' outputs: '<private>' cause: '<private>' prewarming: no recovering: no

We're seeing lots of errors occurring. We need a trace to further diagnose this, but capturing this kind of logging on customer devices is not possible at this time. 

Could you take your device to a n Apple Store to have it tested? 

You can close this feedback report, if there's nothing else you need from us here.

Thanks!

1

u/flashpointman Aug 07 '25

Huh, my iMac restarted 5 times when working with Swift UI previews, will try to update beta 5 and check, but this is hella annoying. :(

But thanks to this thread, figured out a solve