Comment # 6 on bug 902697 from Martin Vidner

This bit of the demangled backtrace:

/usr/lib/YaST2/plugin/libpy2lang_ruby.so(y2_require(char const*)+0x30)
[0xb6f9e310]
/usr/lib/YaST2/plugin/libpy2lang_ruby.so(YRuby::YRuby()+0x126) [0xb6f955a6]
/usr/lib/YaST2/plugin/libpy2lang_ruby.so(YRuby::yRuby()+0x49) [0xb6f957f9]
/usr/lib/YaST2/plugin/libpy2lang_ruby.so(Y2CCRuby::Y2CCRuby()+0x3c)
[0xb6f8fb1c]
/usr/lib/YaST2/plugin/libpy2lang_ruby.so(+0x8ae9) [0xb6f8eae9]

shows that it crashes in YRuby::YRuby(), on
  y2_require("rubygems");

After that there is a deep nesting of calls, so I think we should use strace to
find which files are getting loaded. That should give a hint:

  strace -o strace.log -f -s999 -efile /usr/lib/YaST2/bin/y2base add-on qt

Frans, please attach the output of that.