Azure.Storage.Blobs UploadAsync raises System.ObjectDisposedException: Cannot access a disposed object.

When I try to upload different files, I get the following error:

System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'SslStream'.
   at System.Net.ConnectStream.EndWrite(IAsyncResult asyncResult)
   at System.IO.Stream.<>c.<BeginEndWriteAsync>b__53_1(Stream stream, IAsyncResult asyncResult)
   at System.Threading.Tasks.TaskFactory`1.FromAsyncTrimPromise`1.Complete(TInstance thisRef, Func`3 endMethod, IAsyncResult asyncResult, Boolean requiresSynchronization)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.IO.Stream.<CopyToAsyncInternal>d__27.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Azure.Core.RequestContent.StreamContent.<WriteToAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at Azure.Core.Pipeline.HttpWebRequestTransport.<ProcessInternal>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Azure.Core.Pipeline.HttpWebRequestTransport.<ProcessAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Azure.Core.Pipeline.RequestActivityPolicy.<ProcessNextAsync>d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Azure.Core.Pipeline.RequestActivityPolicy.<ProcessAsync>d__9.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Azure.Core.Pipeline.ResponseBodyPolicy.<ProcessAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Azure.Core.Pipeline.ResponseBodyPolicy.<ProcessAsync>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Azure.Core.Pipeline.HttpPipelineSynchronousPolicy.<ProcessAsync>d__1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Threading.Tasks.ValueTask.ThrowIfCompletedUnsuccessfully()
   at Azure.Core.Pipeline.RetryPolicy.<ProcessAsync>d__11.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Azure.Core.Pipeline.RetryPolicy.<ProcessAsync>d__11.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Azure.Core.Pipeline.HttpPipelineSynchronousPolicy.<ProcessAsync>d__1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Azure.Core.Pipeline.HttpPipelineSynchronousPolicy.<ProcessAsync>d__1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Azure.Storage.Blobs.BlobRestClient.BlockBlob.<UploadAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable`1.ConfiguredValueTaskAwaiter.GetResult()
   at Azure.Storage.Blobs.Specialized.BlockBlobClient.<UploadInternal>d__26.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Azure.Storage.Blobs.Specialized.BlockBlobClient.<>c__DisplayClass53_0.<<GetPartitionedUploaderBehaviors>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Azure.Storage.PartitionedUploader`2.<UploadInternal>d__19.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Azure.Storage.Blobs.Specialized.BlockBlobClient.<UploadAsync>d__23.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Azure.Storage.Blobs.Specialized.BlockBlobClient.<UploadAsync>d__25.MoveNext()
--- End of stack trace from previous location where exception was thrown ---

While the error is sporadic, in some cases it always occurs for the same file. I couldn’t figure out the charecteristics of the specific file, but it is not the file size or file name. It happens with small files (less than 1 MB) or larger files (300 MB).

This is the code I use to upload the file:

var serviceUri = new Uri(BlobConnectionString);
var blobServiceClient = new BlobServiceClient(serviceUri);
var container = blobServiceClient.GetBlobContainerClient(ContainerName);
var blobClient = container.GetBlockBlobClient(fileName);

using (var fileStream = File.OpenRead(fileName))
{
	var blobUploadOptions = new BlobUploadOptions
	{
		TransferOptions = new StorageTransferOptions
		{
			InitialTransferSize = BlockSize,
			MaximumConcurrency = Environment.ProcessorCount * 2
		}
	};
	await blobClient.UploadAsync(fileStream, blobUploadOptions);
}

Environment: Azure.Core 1.7.0 Azure.Storage.Blobs 12.7.0 Azure.Storage.Common 12.6.0

Target Framework: .NET 4.8 Windows 10

• IDE and version : Visual Studio 2019 Enterprise - 16.8.2

[hikarunoryoma]

I’ve been hitting this issue when trying to download blobs in parallel. Does this fix potentially also address downloads?

[pakrym]

This issue would be fixed in the next Azure.Core release in the beginning of February. You can use steps from https://github.com/Azure/azure-sdk-for-net/blob/master/sdk/core/Azure.Core/CHANGELOG.md#added-2 as a temporary work-around.