Does Xcode 12 (12A7209) crash Spotlight? Also Core Data template does not run in Simulator. Also makes Mac super hot and fans whirl?!

Developer Tools & Services Xcode
blurstoftimes OP
Created Sep ’20
Replies 47
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Participants 43
Is anyone else experiencing problems with the new Xcode 12 (build 12A7209)? Specifically:

  • Xcode crashes spotlight when running Simulator or Previews

  • Xcode makes Macbook Pro run very hot and fans kick up

  • Using a Core Data template with SwiftUI and running it in Simulator produces a blank white screen and never shows the timestamp list.

Made a feedback ticket using Feedback Assistant, and attached a copy-pasted diagnostic error report for the Spotlight crashing issue.

Is anyone else experiencing this? (I'm on a Macbook Pro 2017 touch bar) on Catalina MacOS.

Is this just me? It's not like this Xcode is in beta anymore, right? The Mac App Store has the updated Xcode 12, but I can see on the Apple Download website that there's an Xcode 12.2 beta as well.. I'm assuming Apple just decided to copy-paste the Xcode 12 beta 6 and rename it Xcode 12.0 for the 12A7209 build and expect everything to work out fine.

My Mac can barely run it without fans blazing and fingers melting as I tap my lava keyboard..


Replies  47
Boosts  0
Views  9.7k
Participants  43
ppbpg OP
Sep ’20
The same and call Developer Documentation crashes all.
allangarcia OP
Sep ’20
Same here. Any solutions yet?
marts47 OP
Sep ’20
Same here. Mac mini (Late 2014).
papagno OP
Sep ’20
Yes, I have the same problem. I also have audio playback issues sometimes while Xcode is open.
rbertke OP
Sep ’20
I believe I'm experiencing the same behavior as of about 2 days ago. Doing an xcode build crashes spotlight and mac (air for me) runs hot. Unfortunately I can't compile/run a project I've been working on now due to this.
dfrobison OP
Sep ’20
I'm also seeing that using the Core Data template with SwiftUI and running it in Simulator produces a blank white screen and never shows the timestamp list.
antonCoder92 OP
Sep ’20
Same problem here.


Mac O.S. Catalina 10.15.6
MB Pro 13" MacBookPro14,1
TomPF OP
Sep ’20
Same here. My Xcode automatically updated to 12 this morning (9/21/2020), and when I ran Xcode, it started crashing spotlight. I am running on a Mac mini (Late 2014) and Catalina 10.15.6
VitorMach OP
Sep ’20
I have the same problem, posted it here a few days ago.
khabib61 OP
Sep ’20
I am getting the same problem.
Xcode 12 causes spotlight to crash every once a while.
maheshsai252 OP
Sep ’20
Using a Core Data template with SwiftUI and running it in Simulator produces a blank white screen.

This is sorted out by clearing data in simulator from "Device->Erase all content and settings".
nickkaczmarek OP
Sep ’20
Spotlight seems to only crash when the simulator is open. Opening developer documentation also insta crashed Xcode.
jakobLIS OP
Sep ’20
I have the same issues. When using simulator, my mac feels very slow and spotlight keeps crashing.
CALL-151 OP
Sep ’20
The developer documentation issue is limited to the App Store version of Xcode. Download directly from https://developer.apple.com/download/more/ to regain access to documentation. This does not solve the Spotlight crash.
edo1493 OP
Sep ’20
I am experiencing the same exact issue.

Kernel_task is up 120% CPU and Spotlight crashes.
dep3 OP
Sep ’20
For the Core Data issue, wrap the body in a NavigationView.

Can anyone confirm that .toolbar requires a NavigationView?
jcsesia OP
Sep ’20
Same problem

Xcode 12.0.1
Catalina 10.15.7

Edit: it seems deactivating "Applications" in Spotlight fixes this issue. Should be confirmed by others
If confirmed this is only a workaround and it must be fixed by Apple
arijo OP
Sep ’20
Same problem

Xcode 12.0.1
Catalina 10.15.7
MacBook Pro 2019
Dushihao OP
Sep ’20
same proplem

Mac OS Catalina 10.15.6
iMac
Xcode 12.0.1
ZubairovValeriy OP
Sep ’20
Same problem
MBP 16 2.4GHz i9 16Gb
Catalina 10.15.6
t.burger OP
Sep ’20
ios updated lastnight and now I have the same issue and can not run my project.

XCode 12.0.1(12A7300)
Catalina 10.15.7

mac mini (2018)
PKIY OP
Sep ’20
Same issue here

macOS Catalina - version 10.15.5
MAC mini (Late 2014)
jitendrafromhampton east OP
Sep ’20
Same issue that I'm facing after updating Xcode 11.4 to Xcode 12

Xcode 12
macOS Catalina 10.15.4
MacBook Air (2017)

Kernel_task is up 100% CPU and Spotlight crashes.

Can anyone have temporary solution for this?
jcsesia OP
Sep ’20
As I wrote in my post (see below), I've unchecked Applications in Spotlight and I don't notice crashes of Spotlight anymore neither high CPU usage when Xcode simulator/previews is running.
So it seems to be a workaround

I've no solution for the Core Data with Simulator issue as I don't use it in my codes.

Hope this helps
tgrashof OP
Sep ’20
same with me,
I always get the "Spotlight quit unexpectedly" message and my last app development cannot be executed via simulator. (
(other apps I developed are running in the simulator but I also get the "Spotlight quit unexpectedly" message there.)

disabling the applications check in Spotlight also does not help

IMac (2020) with macOS Catalina 10.15.7, Xcode version 12.0.1

Does Xcode 12 (12A7209) crash Spotlight? Also Core Data template does not run in Simulator. Also makes Mac super hot and fans whirl?!
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