some_user@unsafebox:/usr/local/apache2/htdocs$ php -v
PHP 5.2.5 (cli) (built: Nov 11 2007 07:56:04) 
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies
some_user@unsafebox:/usr/local/apache2/htdocs$ gdb php
GNU gdb 6.6-debian
Copyright (C) 2006 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 "i486-linux-gnu"...
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
(gdb) run shot.php
Starting program: /usr/bin/php shot.php
[Thread debugging using libthread_db enabled]
[New Thread -1215244608 (LWP 13757)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1215244608 (LWP 13757)]
zend_lookup_class_ex (name=0xb686a018 'A' <repeats 200 times>..., name_length=8377000, use_autoload=1, ce=0x8718250)
    at /root/php-5.2.5/Zend/zend_execute_API.c:1046
1046            zend_str_tolower_copy(lc_name, name, name_length);
(gdb) i r
eax            0x7fd2a8 8377000
ecx            0x861d940        140630336
edx            0xb686a018       -1232691176
ebx            0x85f356c        140457324
esp            0xbf098ce0       0xbf098ce0
ebp            0xbf896048       0xbf896048
esi            0xbf098d00       -1089893120
edi            0x0      0
eip            0x83326e4        0x83326e4 <zend_lookup_class_ex+148>
eflags         0x210286 [ PF SF IF RF ID ]
cs             0x73     115
ss             0x7b     123
ds             0x7b     123
es             0x7b     123
fs             0x0      0
gs             0x33     51
(gdb) i r eip
eip            0x83326e4        0x83326e4 <zend_lookup_class_ex+148>
(gdb) x/1s 0xb686a018
0xb686a018:      'A' <repeats 200 times>...
(gdb) x/15i $eip
0x83326e4 <zend_lookup_class_ex+148>:   mov    %esi,(%esp)
0x83326e7 <zend_lookup_class_ex+151>:   mov    %eax,0x8(%esp)
0x83326eb <zend_lookup_class_ex+155>:   mov    %edx,0x4(%esp)
0x83326ef <zend_lookup_class_ex+159>:   call   0x8335750 <zend_str_tolower_copy>
0x83326f4 <zend_lookup_class_ex+164>:   mov    0xffffff8c(%ebp),%edx
0x83326f7 <zend_lookup_class_ex+167>:   mov    0xffffff84(%ebp),%eax
0x83326fa <zend_lookup_class_ex+170>:   mov    %esi,0x4(%esp)
0x83326fe <zend_lookup_class_ex+174>:   mov    %edx,0x8(%esp)
0x8332702 <zend_lookup_class_ex+178>:   mov    0xfffff83c(%ebx),%edx
0x8332708 <zend_lookup_class_ex+184>:   mov    %eax,0xc(%esp)
0x833270c <zend_lookup_class_ex+188>:   mov    0x138(%edx),%eax
0x8332712 <zend_lookup_class_ex+194>:   mov    %eax,(%esp)
0x8332715 <zend_lookup_class_ex+197>:   call   0x8348bd0 <zend_hash_find>
0x833271a <zend_lookup_class_ex+202>:   test   %eax,%eax
0x833271c <zend_lookup_class_ex+204>:   je     0x8332697 <zend_lookup_class_ex+71>