NullReferenceException in SNIPacket.ReadFromStreamAsync

[MahmudX]

Sentry is reporting this issue a lot (below the exact stack trace). Can you help?

System.NullReferenceException: Object reference not set to an instance of an object.
  ?, in void SNIPacket.ReadFromStreamAsync(Stream stream, SNIAsyncCallback callback)
  ?, in uint SNITCPHandle.ReceiveAsync(ref SNIPacket packet)
  ?, in uint SNIMarsConnection.ReceiveAsync(ref SNIPacket packet)
  ?, in void SNIMarsConnection.HandleReceiveComplete(SNIPacket packet, uint sniErrorCode)
  ?, in void SNIPacket.ReadFromStreamAsync(Stream stream, SNIAsyncCallback callback)+(Task<int> t) => { }
  File "Task.cs", line 2381, in void Task.ExecuteWithThreadLocal(ref Task currentTaskSlot, Thread threadPoolThread)

[JRahnama]

@MahmudX can you provide more info and possibly a repro that could help us reproducing the issue?

[JRahnama]

From the error message I could say this is similar to issue #422. Can you follow on that thread if you see similarity please.

[SuperXCode]

The error is still there

Object reference not set to an instance of an object

at System.Data.SqlClient.SNI.SNIPacket.WriteToStream (System.IO.Stream stream) [0x00000] in :0
at System.Data.SqlClient.SNI.SNITCPHandle.Send (System.Data.SqlClient.SNI.SNIPacket packet) [0x0000c] in :0
at System.Data.SqlClient.SNI.SNIMarsConnection.Send (System.Data.SqlClient.SNI.SNIPacket packet) [0x0000c] in :0
at System.Data.SqlClient.SNI.SNIMarsHandle.SendControlPacket (System.Data.SqlClient.SNI.SNISMUXFlags flags) [0x00034] in :0
at System.Data.SqlClient.SNI.SNIMarsHandle.Dispose () [0x00014] in :0
at System.Data.SqlClient.SNI.TdsParserStateObjectManaged.Dispose () [0x00052] in :0
at System.Data.SqlClient.TdsParserSessionPool.PutSession (System.Data.SqlClient.TdsParserStateObject session) [0x00020] in :0
at System.Data.SqlClient.TdsParser.PutSession (System.Data.SqlClient.TdsParserStateObject session) [0x00008] in :0
at System.Data.SqlClient.TdsParserStateObject.CloseSession () [0x0000c] in :0
at System.Data.SqlClient.SqlCommand.PutStateObject () [0x00011] in :0
at System.Data.SqlClient.SqlCommand.ReliablePutStateObject () [0x00000] in :0
at System.Data.SqlClient.SqlCommand.EndExecuteReader (System.IAsyncResult asyncResult) [0x00022] in :0
at System.Threading.Tasks.TaskFactory1[TResult].FromAsyncCoreLogic (System.IAsyncResult iar, System.Func2[T,TResult] endFunction, System.Action1[T] endAction, System.Threading.Tasks.Task1[TResult] promise, System.Boolean requiresSynchronization) [0x0000f] in <509dd36094194d04bf311b5a53d207f9>:0

[David-Engel]

We don't support SDS in this repo. If it can be repro'd in MDS, please file an issue.

[johnwc]

We are seeing this in our logging as well. What is causing it? @David-Engel what does SDS and MDS stand for?

[johnwc]

The stack trace from Entity Framework 8.0.8.

System.NullReferenceException: Object reference not set to an instance of an object.
  File "SNITcpHandle.cs", line 902, in uint SNITCPHandle.ReceiveAsync(ref SNIPacket packet)
    packet.ReadFromStreamAsync(_stream);
  File "SNIMarsConnection.cs", line 144, in uint SNIMarsConnection.ReceiveAsync(ref SNIPacket packet)
    return response;
  File "SNIMarsConnection.cs", line 342, in void SNIMarsConnection.HandleReceiveComplete(SNIPacket packet, uint sniErrorCode)
    sniErrorCode = ReceiveAsync(ref packet);
  File "Task.cs", line 2349, in void Task.ExecuteWithThreadLocal(ref Task currentTaskSlot, Thread threadPoolThread)
    ExecutionContext.RunFromThreadPoolDispatchLoop(threadPoolThread, ec, s_ecCallback, this);

[JRahnama]

what does SDS and MDS stand for?

SDS: System.Data.SqlClient
MDS: Microsoft.Data.SqlClient