From: Tanaka Akira <akr@...17n.org>
Date: 2004-11-14T00:00:02+09:00
Subject: [ruby-dev:24827] String#gsub dumps core

次のようにすると core を吐きます。

% ./ruby -e '
str = "a" * 0x20000
str.gsub(/\z/) {
  dest = nil
  ObjectSpace.each_object(String) {|o|
     dest = o if o.length == 0x20000+30
  }
  dest
}
'
-e:3: [BUG] Segmentation fault
ruby 1.9.0 (2004-11-12) [i686-linux]

zsh: abort (core dumped)  ./ruby -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 -e 
str = "a" * 0x20000
str.gsub(/\z/) {
  dest = nil
  ObjectSpace.each'.
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  0x4009e6b1 in kill () from /lib/libc.so.6
(gdb) bt 
#0  0x4009e6b1 in kill () from /lib/libc.so.6
#1  0x4009e435 in raise () from /lib/libc.so.6
#2  0x4009f978 in abort () from /lib/libc.so.6
#3  0x080d50a6 in rb_bug (fmt=0x0) at error.c:214
#4  0x080b2112 in sigsegv (sig=11) at signal.c:446
#5  <signal handler called>
#6  0x400eca1f in memcpy () from /lib/libc.so.6
#7  0x080b8911 in str_gsub (argc=262204, argv=0x4021b000, str=1075607976, bang=0) at string.c:2105
#8  0x080b8c95 in rb_str_gsub (argc=262204, argv=0x4003c, str=262204) at string.c:2214
#9  0x0806a8fa in call_cfunc (func=0x80b8c70 <rb_str_gsub>, recv=1075607976, len=1075945480, argc=31761, argv=0xbfffead8)
    at eval.c:5374
#10 0x0805e847 in rb_call0 (klass=1075668916, recv=1075607976, id=4569, oid=262204, argc=1, argv=0xbfffead8, 
    body=0x401d5e54, nosuper=0) at eval.c:5515
#11 0x0805eaf8 in rb_call (klass=1075668916, recv=1075607976, mid=4569, argc=1, argv=0xbfffead8, scope=0) at eval.c:5736
#12 0x08059968 in rb_eval (self=1075673536, n=0x4003c) at ruby.h:633
#13 0x08058d18 in rb_eval (self=1075673536, n=0x4003c) at eval.c:2929
#14 0x08055e9d in ruby_exec_internal () at eval.c:1465
#15 0x08055eb6 in ruby_exec () at eval.c:1483
#16 0x08055f00 in ruby_run () at eval.c:1500
#17 0x08053f15 in main (argc=262204, argv=0x4003c, envp=0xbffff904) at main.c:38
(gdb) 
-- 
[田中 哲][たなか あきら][Tanaka Akira]