[Mono-bugs] [Bug 612635] New: Delegate Invocation hangs WebBrowser

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Tue Jun 8 14:53:21 EDT 2010



           Summary: Delegate Invocation hangs WebBrowser
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.4.x
          Platform: i686
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: andy at gohanman.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: Other
           Blocker: No

Created an attachment (id=367909)
 --> (http://bugzilla.novell.com/attachment.cgi?id=367909)
Sample code

Description of Problem:
A delegate invocation inside WebBrowser.WebBrowserDocumentCompletedEventHandler
produces inconsistent results. More often than not result is program appears to
be stuck.

Steps to reproduce the problem:
1. Compile the attached test.cs
2. Run result

Actual Results:
Varies. Generally prints "start" then hangs indefinitely. If the URL being
loaded contains content, no rendering takes place.

Expected Results:
Print "start" and "stop", render URL.

How often does this happen? 
If the URL being loaded is extremely simple - a text file containing just
opening and closing html tags, for instance - the program will *occasionally*
print both "start" and "stop". Roughly 10% of the time in my experience. For
any non-trivial URL, the only result I've seen is the indefinite hang.

Additional Information:
OS: Fedora 12
Mono v. 2.4.3
gluezilla v. 2.6
Compiled by: gmcs -target:exe -r:System.Drawing -r:System.Windows.Forms
-out:test.exe test.cs

Removing the delegate invocation fixes the problem for every URL I've tried. I
realize the delegate call is unnecessary in the provided code. I encountered
this problem trying to write a simplified test case for a different bug.

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