NullReferenceException from UaChannelBase.CreateUaBinaryChannel

[Stoffelche]

Type of issue

• [X] Bug
• [ ] Enhancement
• [ ] Compliance
• [ ] Question
• [ ] Help wanted

Current Behavior

we get a NullReferenceException in CreateUaBinaryChannel resulting from the messageContext paramter which is null. This null comes from the ClientBase.MessageContext property, because m_channel is null. We assume the m_channel is set to null in a first attempt to Reconnect: DoReconnectAsync is called and handles as ServiceResultException. Here m_session.DetachChannel() ist called

Then with the next Reconect attempt it has the null m_channel resulting in the NullReferenceException We are using the Nuget version 1.5.374.78, but I don't think anything with respect to this problem has changed.

This is our callstack (note the line numbers are completely messed up, I think because of the async calls, but anyway it is from the mention version). After this the session is not able to reconnect anymore, running into the NullReferenceException again and again.

System.NullReferenceException
  HResult=0x80004003
  Message=Object reference not set to an instance of an object.
  Source=Opc.Ua.Core
  StackTrace:
   at Opc.Ua.UaChannelBase.CreateUaBinaryChannel(ApplicationConfiguration configuration, EndpointDescription description, EndpointConfiguration endpointConfiguration, X509Certificate2 clientCertificate, X509Certificate2Collection clientCertificateChain, IServiceMessageContext messageContext) in Opc.Ua\UaChannelBase.cs:line 393

Opc.Ua.Core.dll!Opc.Ua.UaChannelBase.CreateUaBinaryChannel(Opc.Ua.ApplicationConfiguration configuration, Opc.Ua.EndpointDescription description, Opc.Ua.EndpointConfiguration endpointConfiguration, System.Security.Cryptography.X509Certificates.X509Certificate2 clientCertificate, System.Security.Cryptography.X509Certificates.X509Certificate2Collection clientCertificateChain, Opc.Ua.IServiceMessageContext messageContext) Line 393
    at Opc.Ua\UaChannelBase.cs(393)
Opc.Ua.Client.dll!Opc.Ua.Client.Session.PrepareReconnectBeginActivate(Opc.Ua.ITransportWaitingConnection connection, Opc.Ua.ITransportChannel transportChannel) Line 3667
    at Opc.Ua.Client\Session.cs(3667)
Opc.Ua.Client.dll!Opc.Ua.Client.Session.ReconnectAsync(Opc.Ua.ITransportWaitingConnection connection, Opc.Ua.ITransportChannel transportChannel, System.Threading.CancellationToken ct) Line 4957
    at Opc.Ua.Client\Session.cs(4957)
Opc.Ua.Client.dll!Opc.Ua.Client.Session.ReconnectAsync(System.Threading.CancellationToken ct) Line 4928
    at Opc.Ua.Client\Session.cs(4928)
Opc.Ua.Client.dll!Opc.Ua.Client.SessionReconnectHandler.DoReconnectAsync() Line 265
    at Opc.Ua.Client\SessionReconnectHandler.cs(265)
Opc.Ua.Client.dll!Opc.Ua.Client.SessionReconnectHandler.OnReconnectAsync(object state) Line 217
    at Opc.Ua.Client\SessionReconnectHandler.cs(217)
mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) Line 515
    at System.Threading\ExecutionContext.cs(515)
mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) Line 486
    at System.Threading\ExecutionContext.cs(486)
mscorlib.dll!System.Threading.TimerQueueTimer.CallCallback() Line 200
    at System.Threading\TimerQueueTimer.cs(200)
mscorlib.dll!System.Threading.TimerQueueTimer.Fire() Line 158
    at System.Threading\TimerQueueTimer.cs(158)
mscorlib.dll!System.Threading.TimerQueue.FireNextTimers() Line 252
    at System.Threading\TimerQueue.cs(252)

Expected Behavior

Session recovery should work

Steps To Reproduce

1. Establish a connection as client from a debug session.
2. Pause the debug session for a while
3. Resume execution

Environment

- OS:
- Environment:
- Runtime:
- Nuget Version:
- Component:
- Server:
- Client:

Anything else?

No response