iOS app crashing on device at startup with .NET 8 preview 5

[jmezach]

Description

It seems that with .NET 8 preview 5 (and possibly earlier previews) a brand-new .NET MAUI iOS app crashes at startup on an iOS Device running iOS 12.5.5.

Steps to Reproduce

1. Run dotnet new maui -o MauiApp1
2. Run dotnet build -t:Run -f net8.0-ios -p:RuntimeIdentifier=ios-arm64 -p:_DeviceName=<device-id-of-ios-device-with-12.5.5>
3. App crashes with the following error: error: * Assertion at /Users/runner/work/1/s/src/mono/mono/utils/mono-hwcap-arm64.c:28, condition `res == 0' not met

Link to public reproduction project repository

https://github.com/jmezach/MauiApp8CrashRepro

Version with bug

8.0.0-preview.5.8529

Last version that worked well

7.0.86

Affected platforms

iOS

Affected platform versions

iPhone OS 12.5.5

Did you find any workaround?

No response

Relevant log output

No response

[drasticactions]

Did you try deploying a non-MAUI UI iOS app with that SDK to see what it does?

Try running

dotnet workload install ios
dotnet new ios

and run the resulting program.

[ghost]

Hi @jmezach. We have added the "s/needs-info" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[drasticactions]

CC @rolfbjarne, have you seen this before?

[rolfbjarne]

CC @rolfbjarne, have you seen this before?

Yes, I believe it'll be fixed by dotnet/runtime#87189.

I believe .NET 8.0.100-preview.6.23315.27 or later should have the fix.

[jmezach]

@drasticactions I'll have to get back to you on that next week as I'm currently working from home and don't have the iOS device running this version with me, it is in the office.

@rolfbjarne That issue specifically talks about Mac Catalyst which is a different OS afaik than iOS.

[rolfbjarne]

@rolfbjarne That issue specifically talks about Mac Catalyst which is a different OS afaik than iOS.

That's correct, but they're very similar, and that code is specific to ARM64, which applies to both iOS and Mac Catalyst.

It's also exactly the assert message I was getting on Mac Catalyst.

[jmezach]

@rolfbjarne Thought so, just wanted to check. We'll give it another try when preview 6 ships to see if that fixes our issue and report back here. Thanks for the quick reply!

[gabsamples6]

@rolfbjarne @drasticactions Hi not sure if same issue but any new iOS app I run in preview 5 .net 8 attached to a physical device I get error. Just launch a brand new app from template in iOS attached to a physical device and I get

Is it me ? Can you run any iOS attached to a device?

[rolfbjarne]

Hi not sure if same issue but any new iOS app I run in preview 5 .net 8 attached to a physical device I get error. Just launch a brand new app from template in iOS attached to a physical device and I get

That's a known issue in preview 5 that we unfortunately were not able to fix before it went out. It'll be fixed in preview 6.

[gabsamples6]

@rolfbjarne Thank you for your prompt reply - these days is very much appreciated

[jmezach]

We just tried preview 6 and can confirm that this issue appears to be fixed. However we've found a new bug as described in #16097.