.NET 8 - Fatal error - Attempted to read or write protected memory

[nicolascotton]

Hi,

When I upgraded my projects to .NET 8, some of my queries were failing with a fatal error:

Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
 at DynamicClass.Deserialize1438ca86-58d3-4c26-a016-8aeb80aaf8ea(System.Data.Common.DbDataReader)
 at Dapper.SqlMapper+<>c__DisplayClass167_0`8[[One, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Two, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ValueTuple`2[[One, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Two, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].<GenerateMapper>b__0(System.Data.Common.DbDataReader)
 at Dapper.SqlMapper+<MultiMapImpl>d__164`8[[One, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Two, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ValueTuple`2[[One, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Two, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
 at System.Collections.Generic.List`1[[System.ValueTuple`2[[One, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Two, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]]..ctor(System.Collections.Generic.IEnumerable`1<System.ValueTuple`2<One,Two>>)
 at System.Linq.Enumerable.ToList[[System.ValueTuple`2[[One, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Two, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](System.Collections.Generic.IEnumerable`1<System.ValueTuple`2<One,Two>>)
 at Dapper.SqlMapper+<MultiMapAsync>d__52`8[[One, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Two, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ValueTuple`2[[One, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Two, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1+AsyncStateMachineBox`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[Dapper.SqlMapper+<MultiMapAsync>d__52`8[[One, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Two, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ValueTuple`2[[One, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Two, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Dapper, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null]].ExecutionContextCallback(System.Object)
 at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1+AsyncStateMachineBox`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[Dapper.SqlMapper+<MultiMapAsync>d__52`8[[One, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Two, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ValueTuple`2[[One, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Two, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Dapper, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext(System.Threading.Thread)
 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1+AsyncStateMachineBox`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[Dapper.SqlMapper+<MultiMapAsync>d__52`8[[One, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Two, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ValueTuple`2[[One, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Two, ConsoleApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Dapper, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
 at System.Runtime.CompilerServices.TaskAwaiter+<>c.<OutputWaitEtwEvents>b__12_0(System.Action, System.Threading.Tasks.Task)
 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction(System.Action, Boolean)
 at System.Threading.Tasks.Task.RunContinuations(System.Object)
 at System.Threading.Tasks.Task.ExecuteWithThreadLocal(System.Threading.Tasks.Task ByRef, System.Threading.Thread)
 at System.Threading.Tasks.ThreadPoolTaskScheduler.TryExecuteTaskInline(System.Threading.Tasks.Task, Boolean)
 at System.Threading.Tasks.TaskScheduler.TryRunInline(System.Threading.Tasks.Task, Boolean)
 at System.Threading.Tasks.TaskContinuation.InlineIfPossibleOrElseQueue(System.Threading.Tasks.Task, Boolean)
 at System.Threading.Tasks.ContinueWithTaskContinuation.Run(System.Threading.Tasks.Task, Boolean)
 at System.Threading.Tasks.Task.RunContinuations(System.Object)
 at System.Threading.Tasks.Task`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].TrySetResult(System.__Canon)
 at System.Threading.Tasks.UnwrapPromise`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].TrySetFromTask(System.Threading.Tasks.Task, Boolean)
 at System.Threading.Tasks.UnwrapPromise`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ProcessInnerTask(System.Threading.Tasks.Task)
 at System.Threading.Tasks.Task.RunContinuations(System.Object)
 at System.Threading.Tasks.Task.ExecuteWithThreadLocal(System.Threading.Tasks.Task ByRef, System.Threading.Thread)
 at System.Threading.ThreadPoolWorkQueue.Dispatch()
 at System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()

Using Dapper 2.1.24, the following program works with .NET 7, but fails with .NET 8:

using System;
using System.Threading.Tasks;
using Microsoft.Data.SqlClient;
using Dapper;

public class Program
{	
	internal record struct One( int OID );
	internal record struct Two( int OID, string Name );
	
	public static async Task Main()
	{
		using var cnn = new SqlConnection(FiddleHelper.GetConnectionStringSqlServer());
		var sql = @"SELECT 1 AS OID, 2 AS OID, 'Name' AS Name";
		var splitOn = "OID";
		var map = (One x1, Two x2) => (x1, x2);
		
		var results = await cnn.QueryAsync<One, Two, (One, Two)>(sql, map, splitOn: splitOn).ConfigureAwait(false);
		
		foreach(var result in results)
		{
			Console.WriteLine(result);
		}
	}
}

• Fiddle with .NET 8: https://dotnetfiddle.net/lRCBot
• Fiddle with .NET 7: https://dotnetfiddle.net/Xs26kT

[akozmic]

I ran into a very similar issue this morning. I don't get as good of a stack trace but I found that in .NET 8, when I use the QueryAsync with multiple generic parameters and the splitOn column my Integration Tests are crashing with Exit Code 139.

While playing around with it, it seemed related the use of structs

If you go to the provided .NET 8 fiddle and change the DTOs to the following, it runs correctly:

internal record struct One( int OID );
internal record Two( int OID, string Name );

What I found in local testing was that I could use a struct for the first generic parameter TFirst, but using a struct for the 2nd would crash. I assume that it would fail for TThird through TSeventh as well.

[mgravell]

Intriguing. Will prioritize, thanks for the reports. Sorry, I missed this the first time in November - too much email, and this isn't my day job.

[mgravell]

cause identified

[akozmic]

Awesome! Thanks @mgravell

[mgravell]

https://github.com/DapperLib/Dapper/releases/tag/2.1.28