[Libreoffice] [MHST] GDB doesn't show name of methods in backtrace

Hi,
I've tried to add a radio button into print dialog for Writer.
In /sw/source/core/view/printdata.cxx, I have this piece of code (around 
line 310)
http://pastebin.com/gMu70wYm
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    aChoices[3] = aLocalizedStrings.GetString( 30 );
    aChoicesDisabled[3] = sal_False;
    aHelpIds[3] = rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( 
".HelpID:vcl:PrintDialog:PrintContent:RadioButton:3" ) );
    m_aUIProperties[nIdx++].Value = getChoiceControlOpt( rtl::OUString(),
                                                         aHelpIds,
                                                         aPrintRangeName,
                                                         aChoices,
                                                         0 /* always 
default to 'All pages' */,
                                                         rtl::OUString( 
RTL_CONSTASCII_USTRINGPARAM( "Radio" ) ),
                                                         aChoicesDisabled
                                                         );
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

After that I add an item to PRINTOPTUI in 
/sw/source/ui/config/optdlg.src --> the "Current Page"
http://pastebin.com/nrNBz7A6
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
StringArray STR_PRINTOPTUI
{
    ItemList [en-US] =
    {
      ......
< "~All pages"; >;
< "Pa~ges"; >;
< "~Selection"; >;
< "Cu~rrent page"; >;
    };
};
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

When I try to run it, the radio button does appear but when I click on 
that radio button (Current page), Writer just stop and dismiss.

I've tried to debug it by gdb and this is the message.
http://pastebin.com/i4QpmjDS
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Program received signal SIGSEGV, Segmentation fault.
0x0013391a in rtl_uString_acquire ()
   from 
/home/tatung/mhstlibo/git/libo/solver/350/unxlngi6.pro/installation/opt/program/../basis-link/ure-link/lib/libuno_sal.so.3
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I put breakpoint in SwXTextDocument::getRendererCount() (#5 in gdb log 
from pastebin link above). The program does stop at that breakpoint, but 
when I want to step in, it just pass through it :( Like this:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Breakpoint 1, 0x04384774 in 
SwXTextDocument::getRendererCount(com::sun::star::uno::Any const&, 
com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> 
const&) ()
   from 
/home/tatung/mhstlibo/git/libo/solver/350/unxlngi6.pro/installation/opt/program/../basis-link/program/libswlo.so
(gdb) step
Single stepping until exit from function 
_ZN15SwXTextDocument16getRendererCountERKN3com3sun4star3uno3AnyERKNS3_8SequenceINS2_5beans13PropertyValueEEE,
which has no line number information.
In unotxdoc.cxx/getRendererCount, after check IsValid()
In unotxdoc.cxx/getRendererCount 1
[New Thread 0xb1620b70 (LWP 14464)]
[Thread 0xb1620b70 (LWP 14464) exited]
[New Thread 0xb223fb70 (LWP 14465)]
In unotxdoc.cxx/getRendererCount 2
In unotxdoc.cxx/getRendererCount 3
In unotxdoc.cxx/getRendererCount 4
In unotxdoc.cxx/getRendererCount/check pSwView 1
[New Thread 0xb1620b70 (LWP 14466)]
[Thread 0xb223fb70 (LWP 14465) exited]
In unotxdoc.cxx/getRendererCount/check pSwView 2
In unotxdoc.cxx/getRendererCount/check pSwView 3

Program received signal SIGSEGV, Segmentation fault.
0x0013391a in rtl_uString_acquire ()
   from 
/home/tatung/mhstlibo/git/libo/solver/350/unxlngi6.pro/installation/opt/program/../basis-link/ure-link/lib/libuno_sal.so.3
(gdb)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Did I miss any thing? Please help :)

Thanks for your help!
Ta Tung