>>>>> "Y" == Yukihiro Matsumoto <matz / ruby-lang.org> writes: Y> The backtrace tells me little. The patched Ruby and tcltklib.so Y> linked against Tcl/Tk 8.3 (which is not compiled with -lpthread) works Y> fine for me. I need additional information to reproduce your blocking Y> problem. Well, the problem is that it was 1.8.1-preview4 : it was really easy to make it crash, a little more difficult to make it block With 1.8.1 and the patch [ruby-talk:88830] svg don't want to crash or block :-) Guy Decoux