Re: [Gnash-dev] segfault by launching fb-gnash

[Sandro Santilli]

On Wed, May 18, 2011 at 02:29:53PM +0200, Gabriele Mondada wrote:
> Hello,
> On debian squeeze i686, gnash 0.8.9 from tarball, with:
> 
> ./configure --prefix=/usr/xxx --disable-menus --enable-renderer=agg 
> --enable-gui=fb --disable-plugins --disable-sound --enable-media=none 
> --enable-input=touchscreen
> 
> I got segmentation fault by launching fb-gnash. Here is the backtrace:
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0xb76fbf85 in std::basic_string<char, std::char_traits<char>, 
> std::allocator<char> >::basic_string(std::string const&) () from 
> /usr/lib/libstdc++.so.6
> (gdb) bt
> #0  0xb76fbf85 in std::basic_string<char, std::char_traits<char>, 
> std::allocator<char> >::basic_string(std::string const&) () from 
> /usr/lib/libstdc++.so.6
> #1  0x0805fb33 in holder (p=<value optimized out>) at 
> /usr/include/boost/any.hpp:121
> #2  any<std::basic_string<char, std::char_traits<char>, std::allocator<char> 
> > > (
>     p=<value optimized out>) at /usr/include/boost/any.hpp:46
> #3  boost::program_options::typed_value<std::string, char>::default_value (
>     p=<value optimized out>)
>     at /usr/include/boost/program_options/value_semantic.hpp:197
> #4  getSupportedOptions (p=<value optimized out>) at ../gnash.cpp:441
> #5  0x08064327 in main (argc=1, argv=0xbffffce4) at ../gnash.cpp:98

Looks similar to:
https://savannah.gnu.org/bugs/index.php?33145

Can it be you're linking to 2 different versions of libstdc++ ?

> By removing pretty all options in getSupportedOptions(), except "input-file", 
> there is no more segfault but an other error:
> 
> Error: Non-existent media handler  specified
> 
> Maybe due to --enable-media=none
> 
> Workaround: remove the following lines in Player.cpp:
> 
>     if (!_mediaHandler.get()) {
>         boost::format fmt =
>             boost::format(_("Non-existent media handler %1% specified"))
>             % _media;
>         throw GnashException(fmt.str());
>     }
>
> What can I do to help fixing this in the main-line?

File a bug on savannah about it and attach a patch.
Note we'd have retain the "Non-existent media handler"
when someone specifies "-M whatever".

In this case _mediaHandler is set asking the MediaFactory for
the media handler named "" (empty string) which means to get
the default. Only in this case we want to avoid the exception.

--strk; 

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