Xamarin ios App Crashes when deployed

Mike Mendelow 1

Our Xamarin iPhone App works great on local emulators and local phone devices for both Debug AND Release configurations. When deployed to Testlfight and downloaded on iPhone device, the app immediately crashes.

Crash log (attached) shows a generic exception:

Exception Type: EXC_BAD_ACCESS (SIGABRT) Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000000 VM Region Info: 0 is not in any region. Bytes before following region: 4373528576

Was also able to generate run logs (attached) for iOS 14 and 15 but I don't see anything helpful. iOS 15 log does show this, which might be relevant but I don't see an entitlement that matches.

Error getting value for entitlement 'com.apple.private.dt.xctest.internal-client': Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"

PC Visual Studio version 16.1.1.5 Xamarin 16.11.0.17 Xamarin.ios 15.0.0.8

Mac Xamarin.iOS version 15.0.0.8

Linker Behavior is "Link Framework SDKs Only" (If I try to use "Don't Link" I get a native linking error)

NuGet packages installed:

Newtonsoft.Json (13.0.1)

sqlite-net-pcl (1.8.116)

Xam.Plugins.Settings (3.1.1)

Xamarin.Auth (1.7.0)

Xamarin.Essentials (1.7.0)

Xamarin.Forms (5.0.0.2125)

Obviously have googled as much as I could but haven't found any solutions. Would really appreciate any and all suggestions - thank you so much!

Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 26,551 Reputation points Microsoft Vendor

2021-10-19T03:08:47.877+00:00

Due to the policy, there are appid and domain in your question, I have edited it. There is a Entitlements.plist in iOS project, it allows some permissions, you could check if you have checked unnecessary permissions. In addition, I'm afraid the Profile doesn't match the entitlements file's value if there is Extension in your project, refer to https://developer.apple.com/forums/thread/125048
Mike Mendelow 1 Reputation point

2021-10-21T17:14:50.367+00:00

Thank you - I recreated the profile and redeployed but am still getting the crash. Do these mean anything to you?

Oct 21 17:10:37 backboardd(IOKit)[65] <Error>: 6E6359BD-9174-4D74-B9ED-5C0ECA8BAFA7: Event enqueue error:0xe00002e8 type:11 sender:0x11ef44d2005d4
Oct 21 17:10:37 backboardd(IOKit)[65] <Error>: 6E6359BD-9174-4D74-B9ED-5C0ECA8BAFA7: Event enqueue dropped:1 consecutive events

Error getting value for entitlement 'com.apple.private.dt.xctest.internal-client': Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 26,551 Reputation points Microsoft Vendor

2021-10-22T05:35:27.333+00:00

There is a possibility that your app are blocking the access to the Internet, you could try to open the settings of your application, then check if you have selected WLAN & Cellular Data. You could also open the entitlement.plist by View Code to check the key about network. This error is common on MAC programs, but I haven’t seen it on iOS. In addition, may I ask does this issue exist when you debug the app on your iphone? I mean that you depoly it by VS rather than downloading the app to deploy.
Mike Mendelow 1 Reputation point

2021-10-25T16:34:28.877+00:00

Yes I am able to recreate the crash when debugging on the device directly from VS. it seems to be crashing on the attempt to connect to the Azure DB but with no error information. The app does have access to WLAN AND cellular data. Strange that it connects fine in the emulator but not on the device. Any ideas of what to check next?

Thanks for your continued help
Mike Mendelow 1 Reputation point

2021-10-25T21:24:16.21+00:00

Hi, I double checked and the app does have access to WLAN& Cellular and there is nothing in the entitlements.plst related to Networking when I view code. I was able to recreate the crash when debugging on a device through VS. It seems to be crashing on GetItemLinqQueryable when it is trying to query the Azure database with a message "method not found". It's very strange since it works just fine when debugging on the emulators. Any advice?
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 26,551 Reputation points Microsoft Vendor

2021-10-26T05:24:45.753+00:00

About GetItemLinqQueryable and Azure database , I 'm afraid you could post a new thread.
Mike Mendelow 1 Reputation point

2021-10-26T11:27:05.6+00:00

Ok will do. Thank you
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 26,551 Reputation points Microsoft Vendor

2021-10-27T01:42:21.58+00:00

You are welcome.