[Mono-bugs] [Bug 641921] New: Asynchronously invoked delegates are not GCed promptly

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Sun Sep 26 13:25:31 EDT 2010



           Summary: Asynchronously invoked delegates are not GCed promptly
    Classification: Mono
           Product: Mono: Runtime
           Version: 2.6.x
          Platform: Macintosh
        OS/Version: Mac OS X 10.6
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: GC
        AssignedTo: lupus at novell.com
        ReportedBy: jesjones at mindspring.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---

Created an attachment (id=391557)
 --> (http://bugzilla.novell.com/attachment.cgi?id=391557)
test case

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US;
rv: Gecko/20100824 Firefox/3.5.12

When calling a delegate with BeginInvoke the delegate is not GCed in a timely
fashion (e.g. if you remove all references and force a collection they do not
go away). However it appears that no more than ten will be stacked up.

This doesn't appear to be a serious bug, but it does make it much harder to
track down leaks in applications which really really sucks.

Reproducible: Always

Steps to Reproduce:
The attachment has a little app illustrating the problem. Do something like:
gmcs -target:exe -out:app.exe -debug+ AsyncCallbackTest.cs && mono --debug
Actual Results:  
Five debugger instances are reported as leaked.

Expected Results:  
No debugger instances should be reported as leaks (and that happens if you flip
the define in the file to force synchronous calls).

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