Oren Eini

aka Ayende Rahien

Oren Eini

CEO of RavenDB

a NoSQL Open Source Document Database

Get in touch with me:

oren@ravendb.net +972 52-548-6969

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RavenDB Workshops - Deep dive into practical use of Document Data Modeling
  previous post next post  
Nov 28 2014

Solve this bug!

time to read 1 min | 72 words

This took some head scratching before I figured it out.

image

And here is the relevant code:

image

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Tags:
  • bugs

  previous post next post  

Comments

Raif
28 Nov 2014
10:18 AM
Raif

Race condition between creating the TcpListener and starting it and multiple threads calling this code at the same time.

Solution: lock around new TcpListener and tcpListener.Start().

hazzik
28 Nov 2014
10:23 AM
hazzik

RAGE... I hate when people do find available port by iterating and catching exceptions. The correct way to do this is:

listener = new TcpListener(IPAddress.Loopback, 0); // RTFM MSDN listener.Start(); port = ((IPEndPoint)listener.LocalEndpoint).Port;

Let the OS do it's work.

Raif
28 Nov 2014
10:27 AM
Raif

@hazzik wow, goes to say that sometimes RTFM is the best answer :-).

hazzik
28 Nov 2014
10:34 AM
hazzik

Try run this code: https://gist.github.com/hazzik/edd28a7129f820b4579b

How many exceptions!?! Zero.

Giorgi
28 Nov 2014
10:36 AM
Giorgi

I got six exception when I ran it with Linqpad

An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full [Source = Worker Thread]

hazzik
28 Nov 2014
10:47 AM
hazzik

Giorgi they are all unrelated to the problem, it is just because it tries to spawn 1000 threads

bobdina
28 Nov 2014
11:10 AM
bobdina

@hazzik the nuance is that the proxy is trying to create a listener within a known range: 1 - port AFAIK, you do not have this when using 0 as a port

Jahmai Lay
28 Nov 2014
11:13 AM
Jahmai Lay

Signature of the constructor is different between stack and code. You're running old code?

Rasmus Faber
28 Nov 2014
11:21 AM
Rasmus Faber

You have another constructor ProxyServer(int port, int to) that do not catch SocketException?

As Jahmai points out the stacktrace shows ProxyServer..ctor(Int32 from, Int32 to) and not ProxyServer..ctor(Int32& from, Int32 to).

Ayende Rahien
28 Nov 2014
12:46 PM
Ayende Rahien

Jahmai, DING DING DING, yes, that is the issue

Comment preview

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