Socket.Dispose() hangs on Mac when invoked concurrently with a blocking Receive(Message)From #47342
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area-System.Net.Sockets
bug
os-mac-os-x
macOS aka OSX
test-run-core
Test failures in .NET Core test runs
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Tagging subscribers to this area: @dotnet/ncl Issue DetailsDiscovered while implementing tests for #47229. While on Windows and Linux Repro codeprivate static async Task DisposeDuringPendingReceiveFrom_UDP(bool receiveMessageFrom)
{
using var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
socket.Bind(new IPEndPoint(IPAddress.Any, 0));
EndPoint testEndpoint = new IPEndPoint(IPAddress.Parse("1.2.3.4"), 1234);
void DoReceiveFrom()
{
try
{
if (receiveMessageFrom)
{
var flags = SocketFlags.None;
socket.ReceiveMessageFrom(new byte[128], 0, 128, ref flags, ref testEndpoint, out _);
}
else
{
socket.ReceiveFrom(new byte[128], ref testEndpoint);
}
}
catch (Exception ex)
{
Console.WriteLine($"ABORTED! {ex.GetType().Name} : {ex.Message}");
}
}
Console.WriteLine("Starting operation...");
Task receiveTask = Task.Run(DoReceiveFrom);
await Task.Delay(200);
Console.WriteLine("Disposing...");
socket.Dispose(); // HANGS HERE
var timeoutTask = Task.Delay(5000);
Console.WriteLine("Waiting for operation...");
if (Task.WhenAny(receiveTask, timeoutTask) == timeoutTask)
{
Console.WriteLine("TIMEOUT!!!");
}
}DumpDump
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antonfirsov
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Jan 22, 2021
karelz
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os-mac-os-x
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Triage: It is deadlock (or waiting for another packet) on Mac (development scenario) using UDP (which is not super common). Does not affect TCP, which is already fixed -- Idea: Can we reuse TCP solution in UDP as well? Until we have hits from customers / high impact on CI, moving to Future. |
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Hi, same issue for me. I develop my own udp lib under MacOs and after the call Could you suggest any workaround? |
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@rdcm I recommend to go async with either the task-based or the |
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It seems like we did not find a way how to do this on macOS, right @tmds? |
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This seems like dup of #64551. While this is older, the other issue has more discussion in it. So perhaps we can close this one instead @antonfirsov ? |
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Duplicate of #64551. |
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Discovered while implementing tests for #47229.
While on Windows and Linux
Socket.Dispose/Closewill abort a concurrent blockingReceiveFromorReceiveMessageFromcall, on Mac it leads to a hang. The issue is not present with TCP receives.Edit: Shutdown leads to the same result.
Repro code
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