[Mono-bugs] [Bug 665956] New: HttpWebRequest exhaust threads

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Thu Jan 20 14:10:47 EST 2011



           Summary: HttpWebRequest exhaust threads
    Classification: Mono
           Product: Mono: Runtime
           Version: 2.8.x
          Platform: x86-64
        OS/Version: Windows 7
            Status: NEW
          Severity: Critical
          Priority: P5 - None
         Component: io-layer
        AssignedTo: lupus at novell.com
        ReportedBy: mauhumor at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---

User-Agent:       Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b9) Gecko/20100101

Consecutive calls HttpWebRequest GetResponse results in mono crashing with a
messagebox with the title "Fatal error in gc" and the text "too many threads".

The error could be isolated using a minimal program that does only loops like
10 times a second, instantiate an HttpWebRequest and call either GetResponse or
BeginGetResponse result in the error after 50-250 http calls.

Was detected on several machines, with different hardware, all using windows 7.
Tested on Windows 2008 Server and everything run fine on that OS (although all
hardware where virtualized).
Tested also using Mono 1.2.5 without errors on any plataform.

Reproducible: Always

Steps to Reproduce:
1. On windows 7 make a loop that   
2.   instantiate an object of HttpWebRequest
3.   call GetResponse or BeginGetResponse

Actual Results:  
Mono crash after 50-250 calls

Expected Results:  
Keep running forever

// sample program, crashes every time on Windows 7

using System;
using System.IO;
using System.Net;
using System.Threading;

public class Test
    public void Main(string[] args)
        int count = 0;
        while (true)
            string url = "http://www.google.com.br/";
            var request = (HttpWebRequest)WebRequest.Create(url);
            request.Timeout = 10000;
            HttpWebResponse response = null;
                response = (HttpWebResponse)request.GetResponse();
            catch (WebException e)
                Console.WriteLine("exception: " + e.ToString());

            var reader = new StreamReader(response.GetResponseStream());
            string data = reader.ReadToEnd();
            reader.Dispose(); // also tried "close"

            Console.WriteLine("call count so far: " + count++);

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