Memory leak with Renci.SSHNet 2016.0.0 / FEATURE_SOCKET_EAP

[sorenhjarlvig]

Renci is leaking SocketAsyncEventArgs objects when compiled with the FEATURE_SOCKET_EAP flag (seems to be the default build configuration). When compiled without FEATURE_SOCKET_EAP the leak goes away (naturally).
Perhaps this is caused by the use of the SetBuffer-method which according to http://codefruits.blogspot.dk/2013/03/memory-leak-in-c-net-sockets.html must be nulled (SetBuffer(null, 0, 0)) to be garbage collected correctly.
For some reason we didn't see this leak on Windows Server 2008 but when we recently moved our production to Windows Server 2012 the Windows NT service using Renci.SSHNET started to leak 100 MiB a day.

[drieseng]

Can you try using version 2016.1.0-beta1?
I did some minor fixes in that area.

If you can still reproduce the leak, please provide a small repo.

Thx!

[sorenhjarlvig]

I can confirm that 2016.1.0-beta1 seems to have fixed this issue.
For reference the leak can be reproduced on 2016.0.0 simply by running:

class Program
{
static void Main(string[] args)
{
using (
var sftpClient = new SftpClient("xxtest-server", "myuser",
new PrivateKeyFile("test.key")))
{
sftpClient.Connect();
var files = sftpClient.ListDirectory("/test");
Console.WriteLine(files.Count());
sftpClient.Disconnect();
}
GC.Collect();
GC.WaitForPendingFinalizers();
Console.ReadLine(); // Create memory dump at this point and check for SocketAsyncEventArgs instances
}
}