Bug Native Crash - CollisionMeshData::Cleanup()

We have crashes in Crashlytics dashboard and unity console on iOS. But we can't reproduce them.
Unity version: 2021.3.13f
On the previous version 2020.3.26f, we did not have the error.

Code (CSharp):

1. Native Crash - CollisionMeshData::Cleanup() (/Users/bokken/build/output/unity/unity/Modules/Physics/CollisionMeshData.cpp:26)
2.  
3. Thread 23 (crashed)
4. 0   UnityFramework                     0x0000000109e7d448 CollisionMeshData::Cleanup() (/Users/bokken/build/output/unity/unity/Modules/Physics/CollisionMeshData.cpp:26)
5. 1   UnityFramework                     0x000000010a40f200 Mesh::~Mesh() (/Users/bokken/build/output/unity/unity/Runtime/Graphics/Mesh/Mesh.cpp:3412)
6. 2   UnityFramework                     0x0000000109d17ee4 delete_object_internal_step2(Object*) (/Users/bokken/build/output/unity/unity/Runtime/BaseClasses/BaseObject.cpp:1081)
7. 3   UnityFramework                     0x0000000109dd1748 BatchDeleteStep2Threaded(void*) (/Users/bokken/build/output/unity/unity/Runtime/Misc/BatchDeleteObjects.cpp:101)
8. 4   UnityFramework                     0x0000000109e7a670 Thread::RunThreadWrapper(void*) (/Users/bokken/build/output/unity/unity/Runtime/Threads/Thread.cpp:82)
9. 5   libsystem_pthread.dylib            0x00000001ddd6a348 <symbols missing for uuid: 9d142bffcae834649d2e72902c470641>
10. 6   libsystem_pthread.dylib            0x00000001ddd68948 <symbols missing for uuid: 9d142bffcae834649d2e72902c470641>

 

Facing the same issue. No additional details to provide.

 

Has the same issues, as well. Any update on this?

 

The same problem. On all versions of i-devices and all iOS versions. Unity 2021.3.14. We see this crash in Crashlytics. And interesting that unity log at crash moment was empty. Thats why I think than this crash happens on application start.

 

We are encountering the same issue for ios devices. We are using Unity 2021.3.16f.
We are using addressables as well as doing some mesh creation/modification through code so were not sure if its related to either of those.

 

We're having the same issue ourselves atm. We upgraded our project from Unity 2020.3.36f1 to Unity 2021.3.11f1 and our crash rates have gone up drastically on iOS ever since. Also unable to reproduce just yet

 

Same issue here

 

I think we finally managed to run into this issue while testing. At least for us, this happened on an occasion when I pressed the home button twice and swiped the app up to close it in the background. Upon reopening the app, I immediately got an iOS popup telling me the application had crashed and asking whether I wanted to send a crash report (like the one attached).

I checked Unity Analytics shortly after and saw one CollisionMeshData crash from when I was testing and from the same device type (an iPad Pro 10.5-inch, 2017 ("iPad7,4")). If it hadn't been for the popup (which maybe I only got because I was on a TestFlight version), I wouldn't have noticed the crash.

From checking through the stack traces in Unity Analytics, they all appear to be happening for us as part of the cleanup/exit process (CleanupBatchDelete, PlayerCleanup, UnityCleanup, are all mentioned in Thread 0 of the stacktrace):

Code (CSharp):

1. Thread 0
2. 0   libsystem_kernel.dylib             0x00000001d97ecbb4 <symbols missing for uuid: 05f9a5076ae5382fafc54d2e83818c99>
3. 1   UnityFramework                     0x00000001075b1f80 PlatformThread::Join(Thread const*) (/Users/bokken/buildslave/unity/build/Runtime/Threads/Posix/PlatformThread.cpp:0)
4. 2   UnityFramework                     0x00000001075b02d0 Thread::WaitForExit(bool) (/Users/bokken/buildslave/unity/build/Runtime/Threads/Thread.cpp:146)
5. 3   UnityFramework                     0x00000001074fe608 CleanupBatchDelete() (/Users/bokken/buildslave/unity/build/Runtime/Misc/BatchDeleteObjects.cpp:64)
6. 4   UnityFramework                     0x0000000107504438 CleanupEngine() (/Users/bokken/buildslave/unity/build/Runtime/Misc/SaveAndLoadHelper.cpp:597)
7. 5   UnityFramework                     0x000000010750f34c PlayerCleanup(bool) (/Users/bokken/buildslave/unity/build/Runtime/Misc/Player.cpp:664)
8. 6   UnityFramework                     0x0000000107c5f840 UnityCleanup (/Users/bokken/buildslave/unity/build/PlatformDependent/iPhonePlayer/LibEntryPoint.mm:210)

Wondering whether this issue might have something to do with Unity's application quit/cleanup process in general, and potentially have something to do with these sorts of issues: https://forum.unity.com/threads/ios-crash-on-app-exit.1203643/

The forum thread above also mentions PlayerCleanup and UnityCleanup, as well as how Apple introduced "a watchdog timer in iOS 15 to kill processes lasting longer than 5 seconds after the shutdown request".

Not sure what to do with this information exactly but thought it'd be worth sharing here in case it helps

 

Also, the scene I was in when I tried closing the application did have a generous number of MeshColliders (maybe 10-20), in case that's relevant to this CollisionMeshData cleanup process. All of the models had read/write enabled on them, as I've heard having this set to false can cause some issues.

 

Same issue here. Unity2021.3.21

 

In my project, when this crash occurs, [UIApplication DidEnterBackground] with it !

 

Any updates?
we also have this crash on Unity 2021.3.26

 

Any update on this issue? I'm also facing this issue and at this point in crashlytics this has gone to highest occurrence.

Code (CSharp):

1. Crashed: BatchDeleteObjects
2. 0  UnityFramework                 0x5cb5dc CollisionMeshData::Cleanup() + 25 (CollisionMeshData.cpp:25)
3. 1  UnityFramework                 0xbed1e8 Mesh::~Mesh() + 3490 (Mesh.cpp:3490)
4. 2  UnityFramework                 0x443628 delete_object_internal_step2(Object*) + 1123 (BaseObject.cpp:1123)
5. 3  UnityFramework                 0x519e2c BatchDeleteStep2Threaded(void*) + 101 (BatchDeleteObjects.cpp:101)
6. 4  UnityFramework                 0x5c8850 Thread::RunThreadWrapper(void*) + 82 (Thread.cpp:82)
7. 5  libsystem_pthread.dylib        0x2458 _pthread_start + 116
8. 6  libsystem_pthread.dylib        0xab0 thread_start + 8

 

Any updates?
we also have this crash on Unity 2021.3.31