[Mono-devel-list] NullReferenceException in GetHostByName_internal

[Francisco Figueiredo Jr.]

Hi all,

I'm getting NullReferenceException in unmanaged code when trying to run 
Npgsql tests with nunit-console. Kamil Skalski also is getting this problem.

.System.NullReferenceException: Object reference not set to an instance 
of an object
in (unmanaged) 
/home/fxjr/Desenvolvimento/CVSRepositories/MonoCommit/install/lib/libmono.so.0(mono_class_from_name+0xa6) 
[0x550d945a]
in (unmanaged) 
/home/fxjr/Desenvolvimento/CVSRepositories/MonoCommit/install/lib/libmono.so.0 
[0x550b54fc]
in (unmanaged) 
/home/fxjr/Desenvolvimento/CVSRepositories/MonoCommit/install/lib/libmono.so.0 
[0x550b7034]
in (unmanaged) 
/home/fxjr/Desenvolvimento/CVSRepositories/MonoCommit/install/lib/libmono.so.0 
[0x550b75c8]
in <0x0002d> (wrapper managed-to-native) 
System.Net.Dns:GetHostByName_internal (string,string&,string[]&,string[]&)
in [0x00013] (at 
/home/fxjr/Desenvolvimento/CVSRepositories/MonoCommit/mcs/class/System/System.Net/Dns.cs:141) 
System.Net.Dns:GetHostByName (string)
in [0x00007] (at 
/home/fxjr/Desenvolvimento/CVSRepositories/MonoCommit/mcs/class/System/System.Net.Sockets/TcpClient.cs:298) 
System.Net.Sockets.TcpClient:Connect (string,int)
in [0x00010] (at 
/home/fxjr/Desenvolvimento/CVSRepositories/MonoCommit/mcs/class/System/System.Net.Sockets/TcpClient.cs:93) 
System.Net.Sockets.TcpClient:.ctor (string,int)
in [0x00021] (at 
/home/fxjr/Desenvolvimento/CVSRepositories/MonoCommit/mcs/class/Npgsql/Npgsql/NpgsqlClosedState.cs:62) 
Npgsql.NpgsqlClosedState:Open (Npgsql.NpgsqlConnection)
in [0x002b0] (at 
/home/fxjr/Desenvolvimento/CVSRepositories/MonoCommit/mcs/class/Npgsql/Npgsql/NpgsqlConnection.cs:400) 
Npgsql.NpgsqlConnection:Open ()
in <0x0004f> (wrapper remoting-invoke-with-check) 
Npgsql.NpgsqlConnection:Open ()
in [0x00006] (at 
/home/fxjr/Desenvolvimento/CVSRepositories/MonoCommit/mcs/class/Npgsql/Test/ConnectionTests.cs:63) 
NpgsqlTests.ConnectionTests:Open ()


Do you have any idea about what can be causing that?

The strange part is that I have some other standalone apps with the same 
code which works nice, on the same runtime!!


Is there anything I can do to track this problem? Debugger tips? I'm 
getting problems compiling debugger from cvs...

../frontends/scripting/Interpreter.cs(87) error CS0117: 
`Mono.Debugger.DebuggerOptions' does not contain a definition for `IsScript'
../frontends/scripting/Interpreter.cs(102) error CS1501: No overload for 
method `Create' takes `1' arguments
../frontends/scripting/Interpreter.cs(102) error CS8006: Could not find 
any applicable function for this argument list
../frontends/scripting/Interpreter.cs(297) error CS1501: No overload for 
method `Create' takes `1' arguments
../frontends/scripting/Interpreter.cs(297) error CS8006: Could not find 
any applicable function for this argument list
../frontends/scripting/Interpreter.cs(410) error CS0117: 
`Mono.Debugger.Module' does not contain a definition for `SymbolFile'
../frontends/scripting/Interpreter.cs(491) error CS0117: 
`Mono.Debugger.Module' does not contain a definition for `SymbolFile'
../frontends/scripting/Interpreter.cs(570) error CS0117: 
`Mono.Debugger.ThreadGroup' does not contain a definition for 
`DeleteThreadGroup'
../frontends/scripting/Interpreter.cs(660) error CS0117: 
`Mono.Debugger.DebuggerBackend' does not contain a definition for 
`LoadLibrary'
../frontends/scripting/Interpreter.cs(678) error CS0117: 
`Mono.Debugger.BreakpointHandle' does not contain a definition for 
`SourceLocation'
../frontends/command-line/Main.cs(71) error CS0117: 
`Mono.Debugger.DebuggerOptions' does not contain a definition for `IsScript'
ExpressionParser.jay(90) warning CS0162: Unreachable code detected
../frontends/scripting/Command.cs(616) error CS0117: 
`Mono.Debugger.IArchitecture' does not contain a definition for 
`PrintRegisters'
../frontends/scripting/Expression.cs(226) error CS0117: 
`Mono.Debugger.Languages.ILanguage' does not contain a definition for 
`CanCreateInstance'
../frontends/scripting/Expression.cs(229) error CS0117: 
`Mono.Debugger.Languages.ILanguage' does not contain a definition for 
`CreateInstance'
../frontends/scripting/Expression.cs(266) error CS0117: 
`Mono.Debugger.Languages.ILanguage' does not contain a definition for 
`CanCreateInstance'
../frontends/scripting/Expression.cs(269) error CS0117: 
`Mono.Debugger.Languages.ILanguage' does not contain a definition for 
`CreateInstance'
../frontends/scripting/Expression.cs(340) error CS0117: 
`Mono.Debugger.Languages.IVariable' does not contain a definition for 
`CanWrite'
../frontends/scripting/Expression.cs(349) error CS0117: 
`Mono.Debugger.Languages.IVariable' does not contain a definition for 
`SetObject'
../frontends/scripting/Expression.cs(400) error CS0117: 
`Mono.Debugger.IMethod' does not contain a definition for `DeclaringType'
../frontends/scripting/Expression.cs(404) error CS0117: 
`Mono.Debugger.IMethod' does not contain a definition for `HasThis'
../frontends/scripting/Expression.cs(408) error CS0117: 
`Mono.Debugger.IMethod' does not contain a definition for `DeclaringType'
../frontends/scripting/ScriptingContext.cs(255) error CS0117: 
`Mono.Debugger.Process' does not contain a definition for `Name'
../frontends/scripting/ScriptingContext.cs(866) error CS0246: Cannot 
find type `ITargetTypeAlias'
../frontends/scripting/ScriptingContext.cs(832) error CS0161: Not all 
code paths return a value
../frontends/scripting/Style.cs(260) error CS0246: Cannot find type 
`ITargetTypeAlias'
../frontends/scripting/Style.cs(187) error CS0161: Not all code paths 
return a value
Compilation failed: 26 error(s), 1 warnings
make[2]: *** [mdb.exe] Error 1



Thanks in advance.

-- 
Regards,

Francisco Figueiredo Jr.
Membro Fundador do Projeto MonoBrasil - MonoBrasil Project Founder Member
http://monobrasil.softwarelivre.org



-------------
"Science without religion is lame;
religion without science is blind."

                   ~ Albert Einstein