[ruby-dev:24103] core dump with binding, eval, instance_eval and class variable

次のように、binding, eval, instance_eval, class 変数を使うと、core を
吐きます。

% ruby -v -e '
def nil.b
  binding
end
bb = eval("nil.instance_eval \"binding\"", nil.b)
eval("@@a", bb)
'
ruby 1.9.0 (2004-08-14) [i686-linux]
zsh: segmentation fault (core dumped)  ruby -v -e 
% gdb ruby core 
GNU gdb 6.1-debian
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-linux"...Using host libthread_db library "/lib/libthread_db.so.1".

Core was generated by `ruby -v -e 
def nil.b
  binding
end
bb = eval("nil.instance_eval \"binding\"",'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libdl.so.2...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/libcrypt.so.1...done.
Loaded symbols for /lib/libcrypt.so.1
Reading symbols from /lib/libm.so.6...done.
Loaded symbols for /lib/libm.so.6
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
#0  rb_cvar_get (klass=4, id=10310) at variable.c:1725
1725        if (RCLASS(klass)->iv_tbl && st_lookup(RCLASS(klass)->iv_tbl,id,&value)) {
(gdb) bt
#0  rb_cvar_get (klass=4, id=10310) at variable.c:1725
#1  0x08059c7f in rb_eval (self=4, n=0x4) at eval.c:3472
#2  0x0805f3c0 in eval (self=4, src=1075604360, scope=1075604380, 
    file=0x8137c19 "(eval)", line=1) at eval.c:6113
#3  0x0805f5ba in rb_f_eval (argc=2, argv=0x4, self=1075669400) at eval.c:6230
#4  0x08069e9a in call_cfunc (func=0x805f4d0 <rb_f_eval>, recv=1075669400, 
    len=10310, argc=0, argv=0xbffff188) at eval.c:5390
#5  0x0805e207 in rb_call0 (klass=1075674280, recv=1075669400, id=3953, oid=4, 
    argc=2, argv=0xbffff188, body=0x401d61c8, nosuper=0) at eval.c:5530
#6  0x0805e4b8 in rb_call (klass=1075674280, recv=1075669400, mid=3953, 
    argc=2, argv=0xbffff188, scope=1) at eval.c:5751
#7  0x08059408 in rb_eval (self=1075669400, n=0x4) at ruby.h:634
#8  0x0805586b in ruby_exec () at eval.c:1458
#9  0x080558b0 in ruby_run () at eval.c:1479
#10 0x08053985 in main (argc=4, argv=0x4, envp=0xbffff958) at main.c:38
(gdb) 
-- 
[田中 哲][たなか あきら][Tanaka Akira]