[Pnet-developers] [bugs #11627] Crash during Garbage collection of StreamWriter based on HttpStream

[Stephen Compall]

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It relates to:
                bugs #11627, project DotGNU Portable.NET

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 LATEST MODIFICATIONS of bugs #11627:
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               Posted by: Stephen Compall <S11001001>
               Posted on: 2005-01-19 13:50 (America/Chicago)
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Follow-up Comment:
Erich Kitzmüller: since you mentioned the platform, I am curious: did you use
the RPMs I built for Mandrake 10.1?  If so, could you see if the problem is
duplicable in an installation from source with default options?

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 OVERVIEW of bugs #11627:
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URL:
  <http://savannah.gnu.org/bugs/?func=detailitem&item_id=11627>

                 Summary: Crash during Garbage collection of StreamWriter
based on HttpStream
                 Project: DotGNU Portable.NET
            Submitted by: ammoq
            Submitted on: Tue 01/18/2005 at 01:37
                Category: None
                Severity: 5 - Average
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open

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In StreamWriter.Dispose(bool disposing), stream.Flush() is called.
Unfortunately, HttpStream is already disposed, so "underlying" is already
null. HttpStream.Flush() simply calls underlying.Flush(), so this should IMO
throw a NullReferenceException. But, even more unfortunately, the virtual
machine crashes with a segmentation violation, in cvm_call.c line 934, since
tempptr is a null pointer.

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Follow-up Comments:


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Date: Wed 01/19/2005 at 13:50       By: Stephen Compall <S11001001>
Erich Kitzmüller: since you mentioned the platform, I am curious: did you use
the RPMs I built for Mandrake 10.1?  If so, could you see if the problem is
duplicable in an installation from source with default options?

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Date: Wed 01/19/2005 at 09:38       By: Anonymous
I just checked a simple example which throws an NullRef exception normally
but segfaults inside gdb ?.

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Date: Tue 01/18/2005 at 09:30       By: Erich Kitzmüller <ammoq>
It seems that (at least in my configuration: MandrakeLinux 10.1, kernel
2.6.8.1, glibc-2.3.3, gcc 3.4.1) Nullpointer references are not caught for
virtual method calls. The attached short program is enough to cause a crash.







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File Attachments:


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Date: Tue 01/18/2005 at 09:30  Name: Test.cs  Size: 138B   By: ammoq

<http://savannah.gnu.org/bugs/download.php?item_id=11627&item_file_id=2074>

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This item URL is:
  <http://savannah.gnu.org/bugs/?func=detailitem&item_id=11627>

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