Deadlock in mongo db C# drivers when using legacy MongoServer and WebApi

A recent change (inf to 14 days) has introduce a deadlock issue when using the driver in a WepAPI project.

Tested on version master (commit fd5d79c5351e56847ed5d82eed946db609ccdb88)

Steps to reproduce (A sample project is attached)

• Create a Web api project (.NET 4.5.1)
• Add C# driver from GitHub
• Use the legacy MongoServer class to get database and collection reference.

  public ValuesController()

  {

  this.client = new MongoClient(serverUrl);

  this.server = this.client.GetServer();

  this.database = this.server.GetDatabase(databaseName);

  this.collection = this.database.GetCollection<MyResource>("Resources");

  }

• In a WebApi controller, add a call to FindAll (for example) in an async method

  public async Task<IEnumerable<Resource>> Get()

  {

  return await Task.FromResult(this.collection.FindAll());

  }

• Run web site and call twice the same resources. The second call will stay block in

  public static TResult Execute<TResult>(this IReadOperation<TResult> operation, IReadBinding binding, CancellationToken cancellationToken = default(CancellationToken))

  {

  var awaiter = operation.ExecuteAsync(binding, cancellationToken).GetAwaiter();

  return awaiter.GetResult();

  }

  The new High level API work fine