Php was compiled with  
./configure --with-apache=../apache_1.3.20 --enable-debug

Program received signal SIGSEGV, Segmentation fault.
0x080cede0 in call_user_function_ex (function_table=0x820f968, object_pp=0x0, function_name=0x417, retval_ptr_ptr=0xbfffc6cc, 
    param_count=2, params=0xbfffc6d0, no_separation=0, symbol_table=0x0) at zend_execute_API.c:394
394		if (function_name->type==IS_ARRAY) { /* assume array($obj, $name) couple */
(gdb) bt
#0  0x080cede0 in call_user_function_ex (function_table=0x820f968, object_pp=0x0, function_name=0x417, retval_ptr_ptr=0xbfffc6cc, 
    param_count=2, params=0xbfffc6d0, no_separation=0, symbol_table=0x0) at zend_execute_API.c:394
#1  0x0810d4c6 in php_array_walk (target_hash=0x86fc474, userdata=0x0) at array.c:977
#2  0x0810d682 in zif_array_walk (ht=2, return_value=0x82e9654, this_ptr=0x0, return_value_used=0) at array.c:1023
#3  0x080be477 in execute (op_array=0x86d896c) at ./zend_execute.c:1590
#4  0x080cf3be in call_user_function_ex (function_table=0x86f0c70, object_pp=0x82e96f0, function_name=0x82e9614, 
    retval_ptr_ptr=0xbfffccbc, param_count=2, params=0xbfffccc0, no_separation=0, symbol_table=0x0) at zend_execute_API.c:511
#5  0x0810d4c6 in php_array_walk (target_hash=0x86fbd1c, userdata=0x0) at array.c:977
#6  0x0810d682 in zif_array_walk (ht=2, return_value=0x82e9594, this_ptr=0x0, return_value_used=0) at array.c:1023
#7  0x080be477 in execute (op_array=0x85bc83c) at ./zend_execute.c:1590
#8  0x080cf3be in call_user_function_ex (function_table=0x85bd000, object_pp=0x82e8ff8, function_name=0x82e9044, 
    retval_ptr_ptr=0xbfffd2ac, param_count=2, params=0xbfffd2b0, no_separation=0, symbol_table=0x0) at zend_execute_API.c:511
#9  0x0810d4c6 in php_array_walk (target_hash=0x82e7b84, userdata=0x0) at array.c:977
#10 0x0810d682 in zif_array_walk (ht=2, return_value=0x82e9104, this_ptr=0x0, return_value_used=0) at array.c:1023
#11 0x080be477 in execute (op_array=0x831d504) at ./zend_execute.c:1590
#12 0x080cf3be in call_user_function_ex (function_table=0x8321600, object_pp=0x82e86f8, function_name=0x82e855c, 
    retval_ptr_ptr=0xbfffd89c, param_count=2, params=0xbfffd8a0, no_separation=0, symbol_table=0x0) at zend_execute_API.c:511
#13 0x0810d4c6 in php_array_walk (target_hash=0x867f63c, userdata=0x0) at array.c:977
#14 0x0810d682 in zif_array_walk (ht=2, return_value=0x82e8744, this_ptr=0x0, return_value_used=0) at array.c:1023
#15 0x080be477 in execute (op_array=0x83204c4) at ./zend_execute.c:1590
#16 0x080be64b in execute (op_array=0x8320f4c) at ./zend_execute.c:1630
#17 0x080be64b in execute (op_array=0x83073ac) at ./zend_execute.c:1630
#18 0x080be64b in execute (op_array=0x824522c) at ./zend_execute.c:1630
#19 0x080b2e6a in zend_execute_scripts (type=8, retval=0x0, file_count=3) at zend.c:809
#20 0x08080dce in php_execute_script (primary_file=0xbffff570) at main.c:1310
#21 0x0807c0d6 in apache_php_module_main (r=0x823bc34, display_source_mode=0) at sapi_apache.c:90
#22 0x0807a93c in send_php () at eval.c:41
---Type <return> to continue, or q <return> to quit---
#23 0x0807a995 in send_parsed_php () at eval.c:41
#24 0x08157bc7 in ap_invoke_handler () at eval.c:41
#25 0x0816b9b3 in process_request_internal () at eval.c:41
#26 0x0816ba14 in ap_process_request () at eval.c:41
#27 0x08162e65 in child_main () at eval.c:41
#28 0x08163010 in make_child () at eval.c:41
#29 0x08163184 in startup_children () at eval.c:41
#30 0x081637d7 in standalone_main () at eval.c:41
#31 0x08163fff in main () at eval.c:41
#32 0x400cc7c7 in __libc_start_main (main=0x8163c60 <main>, argc=2, ubp_av=0xbffff9a4, init=0x8062b18 <_init>, 
    fini=0x8191d00 <_fini>, rtld_fini=0x4000db74 <_dl_fini>, stack_end=0xbffff99c) at ../sysdeps/generic/libc-start.c:129

Looking at backtrace i noticed array_walk, and since my script an array walk to run macro functions on a group of objects i looked into the code.  After rewriting the code to no longer use array_walk, the segfault went away.

Below is the array_walk code, but it works most of the time, only in certain situations do segfaults happen.

I'm sorry i can't give you more helpful information.

macroTransverse is called from the base object in the stack by

reset($this->store);    array_walk($this->store,array($this,"macroTransverse"));

This is a method on a base object, that multiple other objects extend from.
function macroTransverse (&$obj,$key)
        {
                if ($this->isSlate($obj))
                {
                        if (is_object($obj))
                        {
                                $obj->macro();
                        }
                        if (!empty($obj->store))
                        {
                                if (is_array($obj->store))
                                {
                                        reset($obj->store);
                                        array_walk($obj->store,array($obj,"macroTransverse"));
                                        reset($obj->store);
                                }
                        }
                }
        }

Does this happen with PHP 4.1.0RC3 ?

http://download.php.net/~zeev/php-4.1.0RC3.tar.gz

No feedback. It's probably a dupe of #11389.