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OpenAsync throws System.IO.EndOfStreamException

See original GitHub issue

Sometimes i’m receiving EndOfStreamException when calling _con.OpenAsync(cancellationToken) maybe due a timeout.

System.AggregateException: One or more errors occurred. (Attempted to read past the end of the stream.) ---> System.IO.EndOfStreamException: Attempted to read past the end of the stream.
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
   at MySql.Data.ValueTaskExtensions.<>c__DisplayClass0_0`2.<ContinueWith>b__0(Task`1 task)
   at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
   at System.Threading.Tasks.Task.Execute()
--- 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 MySql.Data.Serialization.MySqlSession.TryAsyncContinuation(Task`1 task)
   at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
   at System.Threading.Tasks.Task.Execute()
--- 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`1.GetResult()
   at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable`1.ConfiguredValueTaskAwaiter.GetResult()
   at MySql.Data.Serialization.MySqlSession.<TryPingAsync>d__24.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 MySql.Data.MySqlClient.ConnectionPool.<GetSessionAsync>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 MySql.Data.MySqlClient.MySqlConnection.<CreateSessionAsync>d__54.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 MySql.Data.MySqlClient.MySqlConnection.<OpenAsync>d__11.MoveNext()

I notice that this exception is handled at:

https://github.com/mysql-net/MySqlConnector/blob/master/src/MySqlConnector/Serialization/MySqlSession.cs#L140

        public async Task<bool> TryPingAsync(IOBehavior ioBehavior, CancellationToken cancellationToken)
        {
            await SendAsync(PingPayload.Create(), ioBehavior, cancellationToken).ConfigureAwait(false);
            try
            {
                var payload = await ReceiveReplyAsync(ioBehavior, cancellationToken).ConfigureAwait(false);
                OkPayload.Create(payload);
                return true;
            }
            catch (EndOfStreamException)
            {
            }
            catch (SocketException)
            {
            }

            return false;
        }

Maybe await SendAsync(PingPayload.Create(), ioBehavior, cancellationToken).ConfigureAwait(false); should be inside try catch to?

Issue Analytics

State:
Created 7 years ago
Comments:5 (2 by maintainers)

Top GitHub Comments

1reaction

bgraingercommented, Oct 27, 2016

Fixed in 0.6.1.

I wasn’t able to reproduce the precise crash (in the original call stack you posted), but I did fix the problem of EndOfStreamException (or any exception) being unnecessarily wrapped inside AggregateException. Fixing this should allow the exception to go through the regular exception-handling code path, which should resolve your issue. If it’s not fixed, please reopen this case!

1reaction

caleblloydcommented, Oct 27, 2016

Looks like the problem is that System.AggregateException is getting thrown, and not caught in TryPingAsync

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