[Mono-dev] Strange Casting bug in .net 4 profile

Gary Thomas Gary.Thomas at ioko.com
Wed Aug 18 12:55:06 EDT 2010 

Hi Atsushi,
	Good point about Microsoft.Transactions.Bridge.dll. I built and ran the test application in Linux but then copied the binary onto my Windows machine to run reflector over it which would have pulled in the Microsoft System.ServiceModel.dll.

All the other data including the mono --debug trace below was done on Linux. So the problem is real but the dependencies shown in reflector are not representative. I wonder how to get the same information under Linux?

As for the similar bugs I just searched for System.Configuration and InvalidCastException in bugzilla and saw a few things. Nothing that looked exactly like my issue though.

Thanks,
Gary

-----Original Message-----
From: Atsushi Eno [mailto:atsushieno at veritas-vos-liberabit.com] 
Sent: 18 August 2010 17:08
To: Gary Thomas
Cc: Robert Jordan; mono-devel-list at lists.ximian.com
Subject: Re: [Mono-dev] Strange Casting bug in .net 4 profile

Hello,

We don't have Microsoft.Transactions.Bridge.dll, so you are very likely 
using System.ServiceModel.dll from .NET Framework, not ours. We don't 
support MS assemblies (no point of doing that as you are not supposed to 
be allowed to use it on non-Windows environment).

BTW what exactly are "some similar looking bugs" ? I'm not aware of such 
ones.

Atsushi Eno


On 2010/08/19 0:05, Gary Thomas wrote:
> A little more digging using reflector on the binary shows the path to 
> the dependency as follows:
>
> CastBug 0.0.0.0 depends on
> System.ServiceModel 4.0.0 which depends on
> Microsoft.Transactions.Bridge 3.0.0 which depends on
> System.ServiceModel 3.0.0.0
>
>
>
> -----Original Message-----
> From: mono-devel-list-bounces at lists.ximian.com 
> [mailto:mono-devel-list-bounces at lists.ximian.com] On Behalf Of Gary Thomas
> Sent: 18 August 2010 15:42
> To: Robert Jordan; mono-devel-list at lists.ximian.com
> Subject: Re: [Mono-dev] Strange Casting bug in .net 4 profile
>
> There are some similar looking bugs on bugzilla but it is still 
> happening in trunk now.
>
> I just deleted /opt/mono
> ran:
> make clean
> git pull
> ./autogen.sh --prefix=/opt/mono
> make
> sudo make install
>
> then recompiled the test app, ran it and still get the same results.
>
> Below is a trace of the application run with --debug. It seems to show 
> that System.Configuration 2.0.0.0 assembly load is redirected to 4.0.0.0
> However I see that two versions of System.ServiceModel are being 
> loaded (the class I am trying to cast to is in System.ServiceModel) so 
> perhaps this is the problem after all.
> Any idea how to fix? Is it a binding redirect in the mono config file 
> or something simple like that?
>
> Thanks,
> Gary
>
> [mono] ~/Projects/CastBug @ MONO_LOG_LEVEL=debug MONO_LOG_MASK=asm 
> mono --debug CastBug.exe
> Mono: Assembly Loader probing location: 
> '/opt/mono/lib/mono/4.0/mscorlib.dll'.
> Mono: Image addref mscorlib 0x86f5088 -> 
> /opt/mono/lib/mono/4.0/mscorlib.dll 0x86f4710: 2
>
> Mono: Assembly Loader loaded assembly from location: 
> '/opt/mono/lib/mono/4.0/mscorlib.dll'.
> Mono: Assembly Ref addref mscorlib 0x86f5088 -> mscorlib 0x86f5088: 1
>
> Mono: Assembly mscorlib 0x86f5088 added to domain CastBug.exe, ref_count=2
>
> Mono: Assembly Loader probing location: 'CastBug.exe'.
> Mono: Image addref CastBug 0x87443a0 -> 
> /home/garyt/Projects/CastBug/CastBug.exe 0x86f3c00: 3
>
> Mono: Assembly CastBug 0x87443a0 added to domain CastBug.exe, ref_count=1
>
> Mono: Assembly Loader loaded assembly from location: 'CastBug.exe'.
> Mono: Assembly Loader probing location: 'CastBug.exe'.
> Mono: Assembly Ref addref CastBug 0x87443a0 -> mscorlib 0x86f5088: 3
>
> Mono: Assembly Loader probing location: 
> '/opt/mono/lib/mono/gac/System.ServiceModel/4.0.0.0__b77a5c561934e089/System.ServiceModel.dll'.
> Mono: Image addref System.ServiceModel 0x874c5d8 -> 
> /opt/mono/lib/mono/gac/System.ServiceModel/4.0.0.0__b77a5c561934e089/System.ServiceModel.dll 
> 0x874bd20: 2
>
> Mono: Assembly System.ServiceModel 0x874c5d8 added to domain 
> CastBug.exe, ref_count=1
>
> Mono: Assembly Loader loaded assembly from location: 
> '/opt/mono/lib/mono/gac/System.ServiceModel/4.0.0.0__b77a5c561934e089/System.ServiceModel.dll'.
> Mono: Assembly Ref addref CastBug 0x87443a0 -> System.ServiceModel 
> 0x874c5d8: 2
>
> Mono: Assembly Loader probing location: 
> '/opt/mono/lib/mono/gac/System.Configuration/4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll'.
> Mono: Image addref System.Configuration 0x87579d8 -> 
> /opt/mono/lib/mono/gac/System.Configuration/4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll 
> 0x8757020: 2
>
> Mono: Assembly System.Configuration 0x87579d8 added to domain 
> CastBug.exe, ref_count=1
>
> Mono: Assembly Loader loaded assembly from location: 
> '/opt/mono/lib/mono/gac/System.Configuration/4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll'.
> Mono: Assembly Ref addref System.ServiceModel 0x874c5d8 -> 
> System.Configuration 0x87579d8: 2
>
> Mono: Assembly Ref addref System.Configuration 0x87579d8 -> mscorlib 
> 0x86f5088: 4
>
> Mono: Assembly Ref addref CastBug 0x87443a0 -> System.Configuration 
> 0x87579d8: 3
>
> Mono: Assembly Loader probing location: 
> '/opt/mono/lib/mono/gac/System/4.0.0.0__b77a5c561934e089/System.dll'.
> Mono: Image addref System 0x87615f8 -> 
> /opt/mono/lib/mono/gac/System/4.0.0.0__b77a5c561934e089/System.dll 
> 0x8760c10: 2
>
> Mono: Assembly System 0x87615f8 added to domain CastBug.exe, ref_count=1
>
> Mono: Assembly Loader loaded assembly from location: 
> '/opt/mono/lib/mono/gac/System/4.0.0.0__b77a5c561934e089/System.dll'.
> Mono: Assembly Ref addref System.Configuration 0x87579d8 -> System 
> 0x87615f8: 2
>
> Mono: Assembly Loader probing location: 
> '/opt/mono/lib/mono/gac/System.Xml/4.0.0.0__b77a5c561934e089/System.Xml.dll'.
> Mono: Image addref System.Xml 0x876fbb0 -> 
> /opt/mono/lib/mono/gac/System.Xml/4.0.0.0__b77a5c561934e089/System.Xml.dll 
> 0x876f5c0: 2
>
> Mono: Assembly System.Xml 0x876fbb0 added to domain CastBug.exe, 
> ref_count=1
>
> Mono: Assembly Loader loaded assembly from location: 
> '/opt/mono/lib/mono/gac/System.Xml/4.0.0.0__b77a5c561934e089/System.Xml.dll'.
> Mono: Assembly Ref addref System.Configuration 0x87579d8 -> System.Xml 
> 0x876fbb0: 2
>
> Mono: Assembly Ref addref System.Xml 0x876fbb0 -> mscorlib 0x86f5088: 5
>
> Mono: Assembly Ref addref System 0x87615f8 -> mscorlib 0x86f5088: 6
>
> Mono: Assembly Ref addref System.Xml 0x876fbb0 -> System 0x87615f8: 3
>
> Mono: Assembly Loader probing location: 
> '/opt/mono/lib/mono/gac/System.ServiceModel/3.0.0.0__b77a5c561934e089/System.ServiceModel.dll'.
> Mono: Image addref System.ServiceModel 0x8834158 -> 
> /opt/mono/lib/mono/gac/System.ServiceModel/3.0.0.0__b77a5c561934e089/System.ServiceModel.dll 
> 0x88300d0: 2
>
> Mono: Assembly System.ServiceModel 0x8834158 added to domain 
> CastBug.exe, ref_count=1
>
> Mono: Assembly Loader loaded assembly from location: 
> '/opt/mono/lib/mono/gac/System.ServiceModel/3.0.0.0__b77a5c561934e089/System.ServiceModel.dll'.
> Mono: The request to load the assembly System.Configuration v2.0.0.0 
> was remapped to v4.0.0.0
> Mono: Assembly Ref addref System.ServiceModel 0x8834158 -> 
> System.Configuration 0x87579d8: 4
>
> Mono: The request to load the assembly mscorlib v2.0.0.0 was remapped 
> to v4.0.0.0
> Mono: Assembly Ref addref System.ServiceModel 0x8834158 -> mscorlib 
> 0x86f5088: 7
>
> Mono: Assembly Ref addref System 0x87615f8 -> System.Xml 0x876fbb0: 3
>
> System.ServiceModel.Configuration.ServicesSection
> section is ConfigurationSection True
> section is ServicesSection False
> ServiceSection type System.ServiceModel.Configuration.ServicesSection
> Casting section
>
> Unhandled Exception: System.InvalidCastException: Cannot cast from 
> source type to destination type.
> at CastBug.MainClass.Main (System.String[] args) [0x0006e] in 
> /home/garyt/Projects/CastBug/CastBug.cs:19
> [mono] ~/Projects/CastBug @
>
>
> -----Original Message-----
> From: mono-devel-list-bounces at lists.ximian.com 
> [mailto:mono-devel-list-bounces at lists.ximian.com] On Behalf Of Robert 
> Jordan
> Sent: 18 August 2010 13:29
> To: mono-devel-list at lists.ximian.com
> Subject: Re: [Mono-dev] Strange Casting bug in .net 4 profile
>
> Hey,
>
> I believe this is already fixed in trunk. It was a mismatch
> between the 2.0 and 4.0 System.Configuration.dll that were
> loaded together into the same appdomain. This means that
> ServicesSection defined in these assemblies were actually
> incompatible to each other.
>
> Robert
>
> On 18.08.2010 13:52, Gary Thomas wrote:
>> Hi all,
>> I have been using mono from trunk and playing with the WCF stuff when 
>> I noticed an InvalidCastException being thrown. I figured out that 
>> this only happened when using the .net 4 profile, when using .net 3.5 
>> profile it didn't happen.
>> I have put together a simple app to show the problem and here are the 
>> results.
>>
>> With .net 4:
>>
>> [mono] ~/Projects/CastBug @ dmcs CastBug.cs 
>> /reference:System.Configuration /reference:System.ServiceModel
>> CastBug.cs(19,41): warning CS0219: The variable `ss' is assigned but 
>> its value is never used
>> Compilation succeeded - 1 warning(s)
>> [mono] ~/Projects/CastBug @ mono CastBug.exe
>> System.ServiceModel.Configuration.ServicesSection
>> section is ConfigurationSection True
>> section is ServicesSection False
>> ServiceSection type System.ServiceModel.Configuration.ServicesSection
>> Casting section
>>
>> Unhandled Exception: System.InvalidCastException: Cannot cast from 
>> source type to destination type.
>> at CastBug.MainClass.Main (System.String[] args) [0x00000] 
>> in<filename unknown>:0
>>
>>
>> With .net 3.5:
>>
>> [mono] ~/Projects/CastBug @ gmcs CastBug.cs 
>> /reference:System.Configuration /reference:System.ServiceModel
>> CastBug.cs(19,41): warning CS0219: The variable `ss' is assigned but 
>> its value is never used
>> Compilation succeeded - 1 warning(s)
>> [mono] ~/Projects/CastBug @ mono CastBug.exe
>> System.ServiceModel.Configuration.ServicesSection
>> section is ConfigurationSection True
>> section is ServicesSection True
>> ServiceSection type System.ServiceModel.Configuration.ServicesSection
>> Casting section
>> Done casting section
>>
>> The runtime reports the type of the object as ServicesSection but 
>> casting it to a ServicesSection causes an InvalidCastException.
>>
>> Here is the test app:
>>
>> using System;
>> using System.Configuration;
>> using System.ServiceModel.Configuration;
>>
>> namespace CastBug
>> {
>> class MainClass
>> {
>> public static void Main (string[] args)
>> {
>> var section = 
>> ConfigurationManager.GetSection("system.serviceModel/services");
>> Console.WriteLine(section.GetType().ToString());
>> Console.WriteLine("section is ConfigurationSection {0}", section is 
>> ConfigurationSection);
>> Console.WriteLine("section is ServicesSection {0}", section is 
>> ServicesSection);
>> Console.WriteLine("ServiceSection type {0}", 
>> typeof(ServicesSection).ToString());
>>
>> Console.WriteLine("Casting section");
>> // throws an InvalidCastException
>> ServicesSection ss = (ServicesSection)section;
>> Console.WriteLine("Done casting section");
>>
>> }
>> }
>> }
>>
>> Is this a known issue? Should I report a bug? If it was a simple bug 
>> in the c# libraries I would have a go at fixing myself but this seem 
>> more fundamental than that.
>>
>> Thanks,
>> Gary
>
>
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