Issue #5199 has been updated by ko1 (Koichi Sasada). Target version changed from 2.0.0 to 2.1.0 Time up for 2.0.0. Nagai-san, how about it? ---------------------------------------- Bug #5199: ext/tk: RB_GC_GUARD seems to be needed in several places https://bugs.ruby-lang.org/issues/5199#change-36417 Author: normalperson (Eric Wong) Status: Assigned Priority: Normal Assignee: nagai (Hidetoshi Nagai) Category: ext Target version: 2.1.0 ruby -v: ruby 1.9.4dev (2011-08-11 trunk 32931) [x86_64-linux] I noticed the following in ext/tk/tkutil/tkutil.c: rb_warning("fail to convert '%s' to string for Tk", RSTRING_PTR(rb_funcall(obj, rb_intern("inspect"), 0, 0))); id = rb_intern(RSTRING_PTR(rb_str_cat2(rb_str_new2("@"), str))); I don't use or know the Tk ext at all, but the above examples do not appear safe from a GC perspective. Compilers can optimize the original VALUE away entirely so GC can collect. RSTRING_PTR (being a macro,) may also evaluate its arguments multiple times. -- http://bugs.ruby-lang.org/