(gdb) run ixpc.php tcp!sources.cs.bell-labs.com!564 ls /
Starting program: /usr/local/php-debug/bin/php ixpc.php tcp!sources.cs.bell-labs.com!564 ls /
[Thread debugging using libthread_db enabled]
[New Thread -1212410176 (LWP 18607)]
d-rwxrwxr-x     9grid   9grid   Thu Oct 20 23:57:21 2005        9grid
d-r-xr-xr-x     adm     adm     Thu Oct 30 01:16:31 2003        adm
d-rwxrwxr-x     sys     sys     Mon Apr 16 20:19:53 2007        contrib
d-rwxrwxr-x     sys     sys     Thu Jul 12 08:08:56 2007        extra
d-rwxrwx---     fastos  fastos  Wed Jun 20 19:41:38 2007        fastos
--rw-rw-r--     sys     sys     Fri Jul 13 06:00:37 2007        lsr
d-rwxrwxrwx     glenda  sys     Wed Jul 11 22:58:57 2007        patch
d-rwxrwxr-x     sys     sys     Fri May 11 14:59:01 2007        plan9
d-rwxrwxr-x     sys     sys     Tue Oct 11 10:00:52 2005        wiki
d-rwxrwxr-x     xen     xen     Fri Jul 14 00:17:58 2006        xen

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1212410176 (LWP 18607)]
_zend_mm_free_int (heap=0x83b81e8, p=<value optimized out>)
    at /home/leon/dev/php-5.2.3/Zend/zend_alloc.c:1921
1921            if (ZEND_MM_IS_FREE_BLOCK(next_block)) {
(gdb) bt
#0  _zend_mm_free_int (heap=0x83b81e8, p=<value optimized out>)
    at /home/leon/dev/php-5.2.3/Zend/zend_alloc.c:1921
#1  0x08279d16 in zend_hash_destroy (ht=0x847d65c)
    at /home/leon/dev/php-5.2.3/Zend/zend_hash.c:526
#2  0x0826fcc5 in _zval_dtor_func (zvalue=0x847d4dc)
    at /home/leon/dev/php-5.2.3/Zend/zend_variables.c:43
#3  0x08263faf in _zval_ptr_dtor (zval_ptr=0x8480160)
    at /home/leon/dev/php-5.2.3/Zend/zend_variables.h:35
#4  0x08279f06 in zend_hash_clean (ht=0x847d570)
    at /home/leon/dev/php-5.2.3/Zend/zend_hash.c:552
#5  0x0829b608 in zend_do_fcall_common_helper_SPEC (execute_data=0xbfee626c)
    at /home/leon/dev/php-5.2.3/Zend/zend_vm_execute.h:255
#6  0x0828d219 in execute (op_array=0x847c580)
    at /home/leon/dev/php-5.2.3/Zend/zend_vm_execute.h:92
#7  0x0826fff2 in zend_execute_scripts (type=8, retval=<value optimized out>, 
    file_count=3) at /home/leon/dev/php-5.2.3/Zend/zend.c:1134
#8  0x0822fb21 in php_execute_script (primary_file=0xbfee862c)
    at /home/leon/dev/php-5.2.3/main/main.c:1794
#9  0x082e86c5 in main (argc=5, argv=0xbfee8744)
    at /home/leon/dev/php-5.2.3/sapi/cli/php_cli.c:1138
(gdb)