(gdb) run -X
Starting program: /usr/local/apache/bin/./httpd -X

Program received signal SIGFPE, Arithmetic exception.
0x80a0ec0 in _php_create_id (newlen=0x0) at session.c:423
423             sprintf(buf, "%ld%ld%0.8f", tv.tv_sec, tv.tv_usec, php_combined_lcg() * 10);
(gdb) bt
#0  0x80a0ec0 in _php_create_id (newlen=0x0) at session.c:423
#1  0x80a1b7f in _php_session_start () at session.c:824
#2  0x80a2e17 in php_if_session_start (ht=0, return_value=0x8225ca4,
    this_ptr=0x0, return_value_used=0) at session.c:1205
#3  0x810f0e2 in execute (op_array=0x821f424) at ./zend_execute.c:1558
#4  0x810f2c3 in execute (op_array=0x81cdaa4) at ./zend_execute.c:1598
#5  0x80832e4 in php_execute_script (primary_file=0xbfbff98c) at main.c:1162
#6  0x80f2538 in apache_php_module_main (r=0x8215034, fd=18,
    display_source_mode=0) at sapi_apache.c:93
#7  0x8080d71 in send_php (r=0x8215034, display_source_mode=0,
    filename=0x8215a94 "/usr/local/apache/htdocs/horde/login.php")
    at mod_php4.c:512
#8  0x8080dbe in send_parsed_php (r=0x8215034) at mod_php4.c:524
#9  0x8118c75 in ap_invoke_handler (r=0x8215034) at http_config.c:508
#10 0x812cc70 in process_request_internal (r=0x8215034) at http_request.c:1215
#11 0x812ccda in ap_process_request (r=0x8215034) at http_request.c:1231
#12 0x8123f7f in child_main (child_num_arg=0) at http_main.c:4177
#13 0x812413d in make_child (s=0x81ba034, slot=0, now=961272397) at http_main.c:4281
#14 0x81242b6 in startup_children (number_to_start=3) at http_main.c:4363
#15 0x81248c0 in standalone_main (argc=2, argv=0xbfbffc24) at http_main.c:4651
#16 0x81250d8 in main (argc=2, argv=0xbfbffc24) at http_main.c:4978

Works fine with PHP 4.0.0 (release).