[Mono-bugs] [Bug 399048] New: "_wapi_connect: error looking up socket handle" when running multithreaded HttpWebRequests

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Tue Jun 10 15:41:27 EDT 2008


           Summary: "_wapi_connect: error looking up socket handle" when
                    running multithreaded HttpWebRequests
           Product: Mono: Runtime
           Version: SVN
          Platform: x86-64
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: io-layer
        AssignedTo: dick at novell.com
        ReportedBy: jan.oravec at 6com.sk
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---

Created an attachment (id=221346)
 --> (https://bugzilla.novell.com/attachment.cgi?id=221346)
Example of code triggering the bug

We are experimenting with web crawler running on Mono, which creates many
threads, each fetching web pages with HttpWebRequest/HttpWebResponse classes.

Shortly after running the attached code (do not forget to set an URL address),
I get warnings like this:

** (./foo.exe:12197): WARNING **: _wapi_connect: error looking up socket handle

** (./foo.exe:12197): WARNING **: _wapi_connect: error looking up socket handle

Sometimes followed by exception:

Unhandled Exception: System.ArgumentOutOfRangeException: Non-negative number
Parameter name: srcOffset
  at System.Buffer.BlockCopy (System.Array src, Int32 srcOffset, System.Array
dst, Int32 dstOffset, Int32 count) [0x00000] 
  at System.Net.WebConnectionStream.BeginRead (System.Byte[] buffer, Int32
offset, Int32 size, System.AsyncCallback cb, System.Object state) [0x00000] 
  at System.Net.WebConnectionStream.Read (System.Byte[] buffer, Int32 offset,
Int32 size) [0x00000] 
  at MainClass.Work () [0x00000] 

As you can see from the code, the above exception is impossible to happen
without memory corruption (probably related with these wapi warnings).

The testing machine has 4 cores (2x dual-core Opteron).

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