[ruby-dev:24315] String#sub! dumps core

次のようにすると core を吐きます。

% ./ruby -e '
s = "a" * 100
s.sub!(/a*/) { s.clear; "b" * 100 }
'
-e:3: [BUG] Segmentation fault
ruby 1.9.0 (2004-09-22) [i686-linux]

zsh: abort (core dumped)  ./ruby -e ' s = "a" * 100 s.sub!(/a*/) { s.clear; "b" * 100 } '
% 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 -e 
s = "a" * 100
s.sub!(/a*/) { s.clear; "b" * 100 }
'.
Program terminated with signal 6, Aborted.
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  0x4009e721 in kill () from /lib/libc.so.6
(gdb) bt
#0  0x4009e721 in kill () from /lib/libc.so.6
#1  0x4009e4c5 in raise () from /lib/libc.so.6
#2  0x4009f9e8 in abort () from /lib/libc.so.6
#3  0x080d1cf6 in rb_bug (fmt=0x0) at error.c:214
#4  0x080afd02 in sigsegv (sig=11) at signal.c:446
#5  <signal handler called>
#6  0x400eca8f in memcpy () from /lib/libc.so.6
#7  0x080b5afd in rb_str_sub_bang (argc=1075608356, argv=0x813a038, str=0) at string.c:1947
#8  0x08069e2a in call_cfunc (func=0x80b5970 <rb_str_sub_bang>, recv=1075608476, len=0, argc=25, argv=0xbfffeb48)
    at eval.c:5371
#9  0x0805e0c7 in rb_call0 (klass=1075668876, recv=1075608476, id=4631, oid=100, argc=1, argv=0xbfffeb48, body=0x401d5d3c, 
    nosuper=0) at eval.c:5511
#10 0x0805e378 in rb_call (klass=1075668876, recv=1075608476, mid=4631, argc=1, argv=0xbfffeb48, scope=0) at eval.c:5732
#11 0x080592b8 in rb_eval (self=1075673496, n=0x64) at ruby.h:635
#12 0x08058668 in rb_eval (self=1075673496, n=0x64) at eval.c:2927
#13 0x0805584b in ruby_exec () at eval.c:1460
#14 0x08055890 in ruby_run () at eval.c:1486
#15 0x08053955 in main (argc=100, argv=0x64, envp=0xbffff964) at main.c:38
(gdb) 
-- 
[田中 哲][たなか あきら][Tanaka Akira]