[iOS] Startup Crash Specific to iOS 12 and .Net 7

[jcsnider]

Description

Default template MAUI app is crashing while on the startup splash screen on iPhones/iPads running iOS 12 when targeting .Net 7.

Works on .Net 6.

Works on .Net 7 when the device is running iOS 13+.

Crash occurs on both simulators and physical devices.

Steps to Reproduce

1. Create a new .Net 7 MAUI project.
2. Try to run on a iOS 12.4 simulator or physical device.

Link to public reproduction project repository

https://github.com/jcsnider/Maui11525_ReproProject

Version with bug

7.0 (current)

Last version that worked well

6.0.424

Affected platforms

iOS

Affected platform versions

iOS 12.4-12.5

Did you find any workaround?

Not at this time.

Relevant log output

Debug Log within Visual Studio (Not sure if relevant):

2022-11-21 08:30:05.855 MauiApp5[8120:408665] *** NSForwarding: warning: object 0x2809c4e70 of class 'Microsoft_Maui_Controls_Platform_iOS_CustomHoverGestureRecognizer' does not implement methodSignatureForSelector: -- trouble ahead
2022-11-21 08:30:05.855 MauiApp5[8120:408665] *** NSForwarding: warning: object 0x2809c4e70 of class 'Microsoft_Maui_Controls_Platform_iOS_CustomHoverGestureRecognizer' does not implement doesNotRecognizeSelector: -- abort

iOS Device Crash Log (Very consistent):
ioscrashlog.txt

Incident Identifier: 0920B8C5-FE3A-4EE4-A7FF-0477762F59BF
CrashReporter Key:   730e27541ec32ccbcc1d375548cf97bc05896618
Hardware Model:      iPad4,1
Process:             BOOSTSecureUpload [8046]
Path:                /private/var/containers/Bundle/Application/7AC1EC21-B5C9-412B-AAD4-D015264F613D/BOOSTSecureUpload.app/BOOSTSecureUpload
Identifier:          [redacted]
Version:             1 (1.0)
Code Type:           ARM-64 (Native)
Role:                Foreground
Parent Process:      launchd [1]
Coalition:           [redacted] [517]


Date/Time:           2022-11-21 08:04:33.5432 -0500
Launch Time:         2022-11-21 08:04:21.5055 -0500
OS Version:          iPhone OS 12.5.5 (16H62)
Baseband Version:    n/a
Report Version:      104

Exception Type:  EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x00000001ba71b9ec
Termination Signal: Trace/BPT trap: 5
Termination Reason: Namespace SIGNAL, Code 0x5
Terminating Process: exc handler [8046]
Triggered by Thread:  0

Thread 0 name:  tid_303  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   CoreFoundation                	0x00000001ba71b9ec ___forwarding___ + 1444
1   CoreFoundation                	0x00000001ba71b9e8 ___forwarding___ + 1440
2   CoreFoundation                	0x00000001ba71d65c _CF_forwarding_prep_0 + 92
3   libobjc.A.dylib               	0x00000001b98ea3cc CALLING_SOME_+initialize_METHOD + 24
4   libobjc.A.dylib               	0x00000001b98efee0 initializeNonMetaClass + 296
5   libobjc.A.dylib               	0x00000001b98f1640 initializeAndMaybeRelock+ 34368 (objc_class*, objc_object*, mutex_tt<false>&, bool) + 260
6   libobjc.A.dylib               	0x00000001b98f95a4 lookUpImpOrForward + 244
7   libobjc.A.dylib               	0x00000001b9906858 _objc_msgSend_uncached + 56
8   BOOSTSecureUpload             	0x0000000100c7640c 0x100c2c000 + 304140
9   BOOSTSecureUpload             	0x0000000100c84468 0x100c2c000 + 361576
10  BOOSTSecureUpload             	0x0000000100f77d74 0x100c2c000 + 3456372
11  BOOSTSecureUpload             	0x0000000100f76b20 0x100c2c000 + 3451680
12  BOOSTSecureUpload             	0x0000000100f6c99c 0x100c2c000 + 3410332
13  BOOSTSecureUpload             	0x0000000100f6a668 0x100c2c000 + 3401320
14  BOOSTSecureUpload             	0x0000000100f3b670 0x100c2c000 + 3208816
15  BOOSTSecureUpload             	0x0000000100e8a5d0 0x100c2c000 + 2483664
16  BOOSTSecureUpload             	0x0000000100e8dc70 0x100c2c000 + 2497648
17  BOOSTSecureUpload             	0x0000000100fab2c4 0x100c2c000 + 3666628
18  BOOSTSecureUpload             	0x0000000101055a1c 0x100c2c000 + 4364828
19  UIKitCore                     	0x00000001e65c1224 -[UIViewController loadViewIfRequired] + 1012
20  UIKitCore                     	0x00000001e6531664 -[UINavigationController _updateScrollViewFromViewController:toViewController:] + 76
21  UIKitCore                     	0x00000001e653196c -[UINavigationController _startTransition:fromViewController:toViewController:] + 172
22  UIKitCore                     	0x00000001e65328a8 -[UINavigationController _startDeferredTransitionIfNeeded:] + 1112
23  UIKitCore                     	0x00000001e6533b3c -[UINavigationController __viewWillLayoutSubviews] + 164
24  UIKitCore                     	0x00000001e6516d4c -[UILayoutContainerView layoutSubviews] + 224
25  UIKitCore                     	0x00000001e7002170 -[UIView+ 13975920 (CALayerDelegate) layoutSublayersOfLayer:] + 1292
26  QuartzCore                    	0x00000001bec54c60 -[CALayer layoutSublayers] + 184
27  QuartzCore                    	0x00000001bec59c08 CA::Layer::layout_if_needed+ 1326088 (CA::Transaction*) + 332
28  QuartzCore                    	0x00000001bebbc3e4 CA::Context::commit_transaction+ 680932 (CA::Transaction*) + 348
29  QuartzCore                    	0x00000001bebea620 CA::Transaction::commit+ 869920 () + 640
30  UIKitCore                     	0x00000001e6b8385c __34-[UIApplication _firstCommitBlock]_block_invoke_2 + 124
31  CoreFoundation                	0x00000001ba6a7d6c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 20
32  CoreFoundation                	0x00000001ba6a7670 __CFRunLoopDoBlocks + 272
33  CoreFoundation                	0x00000001ba6a26d4 __CFRunLoopRun + 1024
34  CoreFoundation                	0x00000001ba6a1fb4 CFRunLoopRunSpecific + 436
35  GraphicsServices              	0x00000001bc8a479c GSEventRunModal + 104
36  UIKitCore                     	0x00000001e6b6ac38 UIApplicationMain + 212
37  BOOSTSecureUpload             	0x0000000100c585a4 0x100c2c000 + 181668
38  BOOSTSecureUpload             	0x0000000100f77e00 0x100c2c000 + 3456512
39  BOOSTSecureUpload             	0x0000000100f76b20 0x100c2c000 + 3451680
40  BOOSTSecureUpload             	0x0000000100f6c99c 0x100c2c000 + 3410332
41  BOOSTSecureUpload             	0x0000000100f6a668 0x100c2c000 + 3401320
42  BOOSTSecureUpload             	0x0000000100f3b670 0x100c2c000 + 3208816
43  BOOSTSecureUpload             	0x0000000100e8a5d0 0x100c2c000 + 2483664
44  BOOSTSecureUpload             	0x0000000100e90e78 0x100c2c000 + 2510456
45  BOOSTSecureUpload             	0x0000000100f4086c 0x100c2c000 + 3229804
46  BOOSTSecureUpload             	0x0000000100c83528 0x100c2c000 + 357672
47  BOOSTSecureUpload             	0x0000000100fa649c 0x100c2c000 + 3646620
48  libdyld.dylib                 	0x00000001ba1658e0 start + 4

[ghost]

Hi @jcsnider. We have added the "s/needs-repro" label to this issue, which indicates that we require steps and sample code to reproduce the issue before we can take further action. Please try to create a minimal sample project/solution or code samples which reproduce the issue, ideally as a GitHub repo that we can clone. See more details about creating repros here: https://github.com/dotnet/maui/blob/main/.github/repro.md

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.

[jcsnider]

Repro case added. To be clear it is the default maui shell application from the visual studio template.

[ghost]

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.

[Raghavendra-Roy]

Thread started: #2
Resolved pending breakpoint for 'Program.Main(System.String[])' to D:\Projects\ProjectName\Platforms\iOS\Program.cs:10 [0x00000].
Loaded assembly: data-0x109f7c000 [External]
Loaded assembly: data-0x109f90000 [External]
Resolved pending breakpoint at 'D:\Projects\ProjectName\Platforms\iOS\Program.cs:13,1' to void Program.Main (string[] args) [0x00001].
The app has been terminated.

[Raghavendra-Roy]

this is the above log when app launches and crashes almost immediately after updating to .net7.

Platforms details:
iOS- 15.6
Minimum OS version is 15.4

[dbullen-uk]

Apologies for my ignorance, does this mean the issue is now fixed? What would I need to do to take advantage of this, as it stops any Maui apps working in iOS < 13. Or do we have to wait for the next release? Is there a workaround in the meantime?

[jcsnider]

Current version of .Net 7 which is 7.0.49 was released 23 days ago so I'd imagine the next build with this fix will be out in a week or two. I am unaware of any preview/nightly automated builds that you could quickly take advantage of.

If your project will run on .Net 6 then you could always fall back to that temporarily as this crash only exists in .Net 7.

[dbullen-uk]

So the fix for this was apparently released yesterday (https://github.com/dotnet/maui/releases/tag/7.0.52)
I've upgraded everything, created a default maui shell application from the visual studio template, attempted to run on a local iPhone 6 (iOS 12.4.8) and still have the same problem (splash screen shows for a few seconds then app closes).
Has anyone else been able to get this working?

[ghost]

Hello lovely human, thank you for your comment on this issue. Because this issue has been closed for a period of time, please strongly consider opening a new issue linking to this issue instead to ensure better visibility of your comment. Thank you!