What is the possible cause of IndexOutOfRangeException for coreDispatcher.RunAsync()?

Hong 1,211

            try
            {
                await coreDispatcher?.RunAsync(CoreDispatcherPriority.Normal, () =>
                    {
                        ...

                    });
            }
            catch (Exception ex)
            {
                ...
            }

The above code throws the following IndexOutOfRangeException occasionally:

 Stack Trace:
   at Internal.Runtime.CompilerHelpers.ThrowHelpers.ThrowIndexOutOfRangeException() + 0x25
   at System.Collections.Generic.Internal.DictionaryBase.FindFirstEntry(Int32) + 0x6d
   at System.Collections.Generic.Internal.HashSet`1.FindFirstKey(TKey&, Int32) + 0x18
   at System.Runtime.InteropServices.CCWLookupMap.GetOrCreateCCW(Object, RuntimeTypeHandle, IntPtr&) + 0x69
   at SharedLibrary!<BaseAddress>+0x8624e0
   at SharedLibrary!<BaseAddress>+0x86249c
   at SharedLibrary!<BaseAddress>+0x86241f
   at System.Runtime.InteropServices.McgMarshal.ObjectToComInterface(Object, RuntimeTypeHandle) + 0xb1
   at System.Runtime.InteropServices.McgMarshal.DelegateToComInterface(Delegate, RuntimeTypeHandle) + 0x41
   at Windows.UI.Core.ICoreDispatcher__Impl.Stubs.RunAsync(__ComObject, CoreDispatcherPriority, DispatchedHandler) + 0x2f

Could anyone offer a tip about the possible causes?

Roy Li - MSFT 32,731 Reputation points Microsoft Vendor

2023-10-27T01:42:06.4266667+00:00

It's hard to say what might be the issue for this exception. Can you reproduce this? If you could reproduce this, it will be better to share the code snippet here so we could dig it further. Also, have you could check the code inside the lambda block which might related to this?
Hong 1,211 Reputation points

2023-10-27T05:26:17.47+00:00

This was reported by app analytics. I am unable to reproduce this.

I noticed the same PC reported IndexOutOfRangeException from multiple unrelated spots of the app's code around the same time. I wonder if this is caused by some computer problem such as low memory.
Hong 1,211 Reputation points

2023-10-27T05:27:34.2966667+00:00

This is reported by app analytics.
Roy Li - MSFT 32,731 Reputation points Microsoft Vendor

2023-10-27T09:35:41.9933333+00:00

That might be a reason. Does this behavior happen on other devices? If this issue happens on specific device only, it's possible that the issue is related to the environment.
Hong 1,211 Reputation points

2023-10-27T12:46:10.6+00:00

Though IndexOutOfRangeException has been thrown by other devices, such clusters of IndexOutOfRangeException are thrown by only one device. It happens occasionally.

Other devices throw only a single instance of IndexOutOfRangeException at a time and it is extremely rare.
Roy Li - MSFT 32,731 Reputation points Microsoft Vendor

2023-10-31T06:48:45.5866667+00:00

It seems be more related with the specific device or the behaviors of the user on that device. If you could directly debug on that device, it will be helpful to locate the issue. But currently, based on the information we have, it's hard to say what is the real reason.

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What is the possible cause of IndexOutOfRangeException for coreDispatcher.RunAsync()?