[Mono-bugs] [Bug 599686] New: Memory leak in Bitmap(JepgStream)

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Mon Apr 26 11:05:59 EDT 2010



           Summary: Memory leak in Bitmap(JepgStream)
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.6.x
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: Sys.Drawing.
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: christian.schmid at eps.ch
         QAContact: mono-bugs at lists.ximian.com
          Found By: Development
           Blocker: ---

Description of Problem:
There is a memory leak when building a Bitmap from a jpeg stram

Steps to reproduce the problem:
Simple NUnit Test:

        public void TestB_JPegDecoding()
            Bitmap pic = new Bitmap(640, 480,
            Stream stream= new MemoryStream();
            pic.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);

            long startMemory = GC.GetTotalMemory(true);

            for (int i = 0; i < 1000; ++i)
                if (pic != null)
                stream.Seek(0, SeekOrigin.Begin);
                pic = new Bitmap(stream);

            long endMemory = GC.GetTotalMemory(true);
            long picSize = 640 * 480 * 24;
            Assert.Less(endMemory, startMemory + 2 * picSize);

Actual Results:
Bitmaps are not properly disposed! Memory allocation raises

Expected Results:
Memory allocation should be stable.

How often does this happen? 

Additional Information:

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