Description:
------------
This crash happens under certain conditions when using the IMP script part of 
the Horde suite of apps (horde.org).

The IMP script is a webmail client and when building the list of emails in the 
INBOX, PHP crashes with this message:
AH00051: child pid 99220 exit signal Illegal instruction (4)

The beginning of the backtrace looks like this:
#0  0x00000008006105e2 in match () from /usr/local/lib/libpcre.so.1
(repeat 7669 times...)
#7670 0x0000000802257bf2 in php_pcre_match_impl
#7671 0x00000008022585f8 in php_do_pcre_match

This seems to happen because of an email with a very long list of recipients, 
which needs to be parsed.


Test script:
---------------
The script generating the error is in horde/services/ajax.php

Expected result:
----------------
On most INBOX, a list of emails is returned.

Actual result:
--------------
Here is the backtrace:
#7670 0x0000000802257bf2 in php_pcre_match_impl (pce=0x81bd04a90,
    subject=0x81c19d710 "elosud@hotmail.com, philippeveignal@hotmail.com, 
C.E.C@lemel.fr, jessyvincent@yahoo.com, ysohrabi@hotmail.com, 
renquin6@cuimail.unige.ch, j_melian@yahoo.com, kayitana@yahoo.com, 
laurentrachel@hotmail."..., subject_len=4000, return_value=0x81c1af0e8, 
subpats=0x0, global=0,
    use_flags=0, flags=<optimized out>, start_offset=0) at /php-
5.4.9/ext/pcre/php_pcre.c:652
        result_set = 0x5aecc60
        match_sets = 0x0
        extra = 0x7fffffffab50
        extra_data = {flags = 18, study_data = 0x800dd5a20, match_limit = 
1000000, callout_data = 0x1,
          tables = 0x6c00000000000000 <Address 0x6c00000000000000 out of 
bounds>, match_limit_recursion = 100000, mark = 0x7fffffffac40,
          executable_jit = 0x7fffffffac4c}
        exoptions = 0
        count = 1
        offsets = <optimized out>
        num_subpats = 1
        size_offsets = <optimized out>
        matched = 0
        g_notempty = 0
        stringlist = 0x0
        subpat_names = 0x81c19ca28
        i = 0
        rc = <optimized out>
        subpats_order = 0
        offset_capture = 0
#7671 0x00000008022585f8 in php_do_pcre_match (ht=2, return_value=0x81c1af0e8, 
return_value_ptr=<optimized out>, this_ptr=<optimized out>,
    return_value_used=<optimized out>, global=0) at /php-
5.4.9/ext/pcre/php_pcre.c:546
        regex = 0x80b9fde30 "/^(?:\n", ' ' <repeats 14 times>, "
[\\x09\\x0A\\x0D\\x20-\\x7E]", ' ' <repeats 12 times>, "# ASCII\n", ' ' <repeats 
12 times>, "| [\\xC2-\\xDF][\\x80-\\xBF]", ' ' <repeats 13 times>, "# non-
overlong 2-byte\n", ' ' <repeats 12 times>, "| \\xE0[\\xA0-\\xBF][\\x80-\\xBF]         
# excluding overl"...
        subject = 0x81c19d710 "elosud@hotmail.com, philippeveignal@hotmail.com, 
C.E.C@lemel.fr, jessyvincent@yahoo.com, ysohrabi@hotmail.com, 
renquin6@cuimail.unige.ch, j_melian@yahoo.com, kayitana@yahoo.com, 
laurentrachel@hotmail."...
        regex_len = 543
        subject_len = 4000
        pce = 0xa
        subpats = 0x0
        flags = 0
        start_offset = 0
#7672 0x00000008025a3c85 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805aede30)
    at /php-5.4.9/Zend/zend_vm_execute.h:642
        ret = 0x805aee050
        opline = 0x80be47790
        should_change_scope = 0 '\000'
        fbc = 0x805bfe300
#7673 0x00000008025a9bb2 in execute (op_array=0x81be40b90) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805aede30
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7674 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805aedbe0)
    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x80be47520
        should_change_scope = 1 '\001'
        fbc = 0x81be40b90
#7675 0x00000008025a9bb2 in execute (op_array=0x81be40b90) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805aedbe0
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7676 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805aed930)
    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x80e709230
        should_change_scope = 1 '\001'
        fbc = 0x81be40b90
#7677 0x00000008025a9bb2 in execute (op_array=0x81bf35348) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805aed930
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7678 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805aed080)
    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x81bf32c40
        should_change_scope = 1 '\001'
        fbc = 0x81bf35348
#7679 0x00000008025a9bb2 in execute (op_array=0x81bf31d10) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805aed080
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7680 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805aecc60)
    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x810325820
        should_change_scope = 1 '\001'
        fbc = 0x81bf31d10
#7681 0x00000008025a9bb2 in execute (op_array=0x81c06bcd8) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805aecc60
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7682 0x000000080256940a in zend_call_function (fci=0x7fffffffb2a0, 
fci_cache=0x7fffffffb2f0)
    at /php-5.4.9/Zend/zend_execute_API.c:958
        i = <optimized out>
        original_return_value = 0x805aeaf00
        calling_symbol_table = 0x0
        original_op_array = 0x81c3902f8
        original_opline_ptr = 0x805aec128
        current_scope = 0x81c389ff0
        current_called_scope = 0x81c389ff0
        calling_scope = 0x81c06b5a8
        called_scope = 0x81c06b5a8
        current_this = 0x81c34a760
        execute_data = {opline = 0x0, function_state = {function = 0x81c06bcd8, 
arguments = 0x805aecc58}, fbc = 0x0, called_scope = 0x0, op_array = 0x0,
          object = 0x81c0c8cd8, Ts = 0x805aec2c8, CVs = 0x805aec1b8, 
symbol_table = 0x0, prev_execute_data = 0x805aec128, old_error_reporting = 0x0,
          nested = 0 '\000', original_return_value = 0x805aeaf00, current_scope 
= 0x81c389ff0, current_called_scope = 0x81c389ff0,
          current_this = 0x81c34a760, current_object = 0x0}
        fci_cache_local = {initialized = 160 '\240', function_handler = 
0x81c3df4a0, calling_scope = 0x81c34a760, called_scope = 0x7fffffffb3d0,
          object_ptr = 0x0}
#7683 0x000000080258d188 in zend_call_method (object_pp=0x7fffffffb450, 
obj_ce=0x81c06b5a8, fn_proxy=0x81c06b6e8, function_name=0x8029f019b "__set",
    function_name_len=5, retval_ptr_ptr=0x7fffffbffb90, param_count=2, 
arg1=0x81c0d13e8, arg2=0x81c0ddc48)
    at /php-5.4.9/Zend/zend_interfaces.c:97
        fcic = {initialized = 1 '\001', function_handler = 0x81c06bcd8, 
calling_scope = 0x81c06b5a8, called_scope = 0x81c06b5a8, object_ptr = 
0x81c0c8cd8}
        result = <optimized out>
        fci = {size = 72, function_table = 0x81c0d33b0, function_name = 
0x7fffffffb320, symbol_table = 0x0, retval_ptr_ptr = 0x7fffffffb438,
          param_count = 2, params = 0x7fffffffb340, object_ptr = 0x81c0c8cd8, 
no_separation = 1 '\001'}
        z_fname = {value = {lval = 140737488335976, dval = 6.9533558068788885e-
310, str = {val = 0x7fffffffb468 "\240\303\027\034\b", len = 2},
            ht = 0x7fffffffb468, obj = {handle = 4294947944, handlers = 
0x800000002}}, refcount__gc = 4294947792, type = 255 '\377',
          is_ref__gc = 127 '\177'}
        retval = <optimized out>
        function_table = <optimized out>
        params = {0x7fffffffb3a8, 0x7fffffffb3b0}
#7684 0x000000080259991f in zend_std_call_setter (value=0x81c0ddc48, 
member=0x81c0d13e8, object=0x81c0c8cd8)
    at /php-5.4.9/Zend/zend_object_handlers.c:174
        retval = 0x0
        ce = 0x81c06b5a8
#7685 zend_std_write_property (object=0x81c0c8cd8, member=<optimized out>, 
value=0x81c0ddc48, key=<optimized out>)
    at /php-5.4.9/Zend/zend_object_handlers.c:567
        guard = 0x81c17c3a0
        zobj = 0x81c0d1a50
        tmp_member = 0x0
        variable_ptr = 0x81c14e7e0
        property_info = <optimized out>
#7686 0x00000008025f61d9 in zend_assign_to_object (retval=0x0, 
object_ptr=0x805aec258, property_name=0x81c0d13e8, value_type=16, 
value_op=0x7fffffffa920,
    Ts=0x1df4, opcode=136, key=0x0) at /php-5.4.9/Zend/zend_execute.c:737
        object = 0x81c0c8cd8
        value = 0x81c0ddc48
#7687 0x00000008025f6553 in ZEND_ASSIGN_OBJ_SPEC_CV_VAR_HANDLER 
(execute_data=0x805aec128)
    at /php-5.4.9/Zend/zend_vm_execute.h:32993
        opline = 0x80e1acde0
        object_ptr = 0x805aec258
        property_name = 0x81c0d13e8
#7688 0x00000008025a9bb2 in execute (op_array=0x81c3902f8) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805aec128
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7689 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805aea9e8)
    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x80e1a1d78
        should_change_scope = 1 '\001'
        fbc = 0x81c3902f8
#7690 0x00000008025a9bb2 in execute (op_array=0x81c38fe20) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805aea9e8
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7691 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805ae9910)
    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x80e1e0eb0
        should_change_scope = 1 '\001'
        fbc = 0x81c38fe20
#7692 0x00000008025a9bb2 in execute (op_array=0x81c3968e0) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805ae9910
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7693 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805ae8d30)
    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x80e1d2570
        should_change_scope = 1 '\001'
        fbc = 0x81c3968e0
#7694 0x00000008025a9bb2 in execute (op_array=0x81c3965b0) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805ae8d30
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7695 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805ae86f8)
    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x81c393b48
        should_change_scope = 1 '\001'
        fbc = 0x81c3965b0
#7696 0x00000008025a9bb2 in execute (op_array=0x81c392618) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805ae86f8
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7697 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805ae6ba8)
    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x80e19b978
        should_change_scope = 1 '\001'
        fbc = 0x81c392618
#7698 0x00000008025a9bb2 in execute (op_array=0x81c38faf0) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805ae6ba8
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7699 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805ae4248)
    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x81c3bb3a8
        should_change_scope = 1 '\001'
        fbc = 0x81c38faf0
#7700 0x00000008025a9bb2 in execute (op_array=0x81c3cbe40) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805ae4248
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7701 0x000000080256940a in zend_call_function (fci=0x7fffffffbcc0, 
fci_cache=0x7fffffffbd10)
    at /php-5.4.9/Zend/zend_execute_API.c:958
        i = <optimized out>
        original_return_value = 0x7fffffffc120
        calling_symbol_table = 0x0
        original_op_array = 0x81c3863e0
        original_opline_ptr = 0x805ae3530
        current_scope = 0x81c34aed8
        current_called_scope = 0x81c34aed8
        calling_scope = 0x81c389ff0
        called_scope = 0x81c389ff0
        current_this = 0x81c346b88
        execute_data = {opline = 0x0, function_state = {function = 0x81c3cbe40, 
arguments = 0x805ae4240}, fbc = 0x0, called_scope = 0x0, op_array = 0x0,
          object = 0x81c34a760, Ts = 0x805ae3650, CVs = 0x805ae35c0, 
symbol_table = 0x0, prev_execute_data = 0x805ae3530, old_error_reporting = 0x0,
          nested = 0 '\000', original_return_value = 0x7fffffffc120, 
current_scope = 0x81c34aed8, current_called_scope = 0x81c34aed8,
          current_this = 0x81c346b88, current_object = 0x0}
        fci_cache_local = {initialized = 4 '\004', function_handler = 
0x81c0447a0, calling_scope = 0x81c044770, called_scope = 0x7fffffffbcc0,
          object_ptr = 0x7fffffffbc88}
#7702 0x000000080247d1b7 in zif_call_user_func_array (ht=<optimized out>, 
return_value=0x81c0447a0, return_value_ptr=<optimized out>,
    this_ptr=<optimized out>, return_value_used=<optimized out>) at /php-
5.4.9/ext/standard/basic_functions.c:4754
        params = 0x81c044770
        retval_ptr = 0x0
        fci = {size = 72, function_table = 0x81c38a018, function_name = 
0x81c0447d0, symbol_table = 0x0, retval_ptr_ptr = 0x7fffffffbd40,
          param_count = 3, params = 0x81c02fb28, object_ptr = 0x81c34a760, 
no_separation = 1 '\001'}
        fci_cache = {initialized = 1 '\001', function_handler = 0x81c3cbe40, 
calling_scope = 0x81c389ff0, called_scope = 0x81c389ff0,
          object_ptr = 0x81c34a760}
#7703 0x00000008025a3c85 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805ae3530)
    at /php-5.4.9/Zend/zend_vm_execute.h:642
        ret = 0x805ae3bf0
        opline = 0x80c006118
        should_change_scope = 0 '\000'
        fbc = 0x805b47800
#7704 0x00000008025a9bb2 in execute (op_array=0x81c3863e0) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805ae3530
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7705 0x000000080256940a in zend_call_function (fci=0x7fffffffbff0, 
fci_cache=0x7fffffffc040)
    at /php-5.4.9/Zend/zend_execute_API.c:958
        i = <optimized out>
        original_return_value = 0x805ae0f38
        calling_symbol_table = 0x0
        original_op_array = 0x81c2a1360
        original_opline_ptr = 0x805ae1c48
        current_scope = 0x0
        current_called_scope = 0x81c34aed8
        calling_scope = 0x81c34aed8
        called_scope = 0x81c34aed8
        current_this = 0x81c346b88
        execute_data = {opline = 0x0, function_state = {function = 0x81c3863e0, 
arguments = 0x805ae3528}, fbc = 0x0, called_scope = 0x0, op_array = 0x0,
          object = 0x81c346b88, Ts = 0x805ae1e58, CVs = 0x805ae1cd8, 
symbol_table = 0x0, prev_execute_data = 0x805ae1c48, old_error_reporting = 0x0,
          nested = 0 '\000', original_return_value = 0x805ae0f38, current_scope 
= 0x81c2a1008, current_called_scope = 0x81c2a1008,
          current_this = 0x81c29fe98, current_object = 0x0}
        fci_cache_local = {initialized = 136 '\210', function_handler = 
0x3110765de7, calling_scope = 0x5, called_scope = 0x81c033780, object_ptr = 0x1}
#7706 0x000000080258d188 in zend_call_method (object_pp=0x7fffffffc110, 
obj_ce=0x81c34aed8, fn_proxy=0x81c34b030, function_name=0x8029bd555 "__call",
    function_name_len=6, retval_ptr_ptr=0x7fffffbffb90, param_count=2, 
arg1=0x81c03bd58, arg2=0x81c03bdd8)
    at /php-5.4.9/Zend/zend_interfaces.c:97
        fcic = {initialized = 1 '\001', function_handler = 0x81c3863e0, 
calling_scope = 0x81c34aed8, called_scope = 0x81c34aed8, object_ptr = 
0x81c346b88}
        result = <optimized out>
        fci = {size = 72, function_table = 0x1ae76e141b1e27, function_name = 
0x7fffffffc070, symbol_table = 0x0, retval_ptr_ptr = 0x7fffffffc120,
          param_count = 2, params = 0x7fffffffc090, object_ptr = 0x81c346b88, 
no_separation = 1 '\001'}
        z_fname = {value = {lval = 140737488339120, dval = 6.9533558070342227e-
310, str = {val = 0x7fffffffc0b0 "(\275\003\034\b", len = 95302928},
            ht = 0x7fffffffc0b0, obj = {handle = 4294951088, handlers = 
0x805ae3510}}, refcount__gc = 3, type = 0 '\000', is_ref__gc = 0 '\000'}
        retval = <optimized out>
        function_table = <optimized out>
        params = {0x7fffffffc0f8, 0x7fffffffc100}
#7707 0x000000080259a5cd in zend_std_call_user_call (ht=<optimized out>, 
return_value=0x81c03bcf8, return_value_ptr=<optimized out>,
    this_ptr=0x81c346b88, return_value_used=<optimized out>) at /php-
5.4.9/Zend/zend_object_handlers.c:870
        func = <optimized out>
        method_name_ptr = 0x81c03bd58
        method_args_ptr = 0x81c03bdd8
        method_result_ptr = 0x0
        ce = 0x81c34aed8
#7708 0x00000008025a3c85 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805ae1c48)
    at /php-5.4.9/Zend/zend_vm_execute.h:642
        ret = 0x805ae27f8
        opline = 0x81c27e178
        should_change_scope = 1 '\001'
        fbc = 0x81c033468
#7709 0x00000008025a9bb2 in execute (op_array=0x81c2a1360) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805ae1c48
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7710 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805ae0c50)
    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x8102e2bd8
        should_change_scope = 1 '\001'
        fbc = 0x81c2a1360
#7711 0x00000008025a9bb2 in execute (op_array=0x81c29d420) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805ae0c50
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7712 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805adcf28)
    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x8102df548
        should_change_scope = 1 '\001'
        fbc = 0x81c29d420
#7713 0x00000008025a9bb2 in execute (op_array=0x81c2799f8) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805adcf28
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7714 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805adc768)

    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x810250b58
        should_change_scope = 1 '\001'
        fbc = 0x81c2799f8
#7715 0x00000008025a9bb2 in execute (op_array=0x81bf89c18) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805adc768
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7716 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805adbd98)
    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x8102969c0
        should_change_scope = 1 '\001'
        fbc = 0x81bf89c18
#7717 0x00000008025a9bb2 in execute (op_array=0x81bed8888) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805adbd98
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7718 0x000000080256940a in zend_call_function (fci=0x7fffffffc790, 
fci_cache=0x7fffffffc7e0)
    at /php-5.4.9/Zend/zend_execute_API.c:958
        i = <optimized out>
        original_return_value = 0x0
        calling_symbol_table = 0x0
        original_op_array = 0x81bf8c7d0
        original_opline_ptr = 0x805adba10
        current_scope = 0x81bf8ad40
        current_called_scope = 0x81bf89300
        calling_scope = 0x81bed8640
        called_scope = 0x81bed8640
        current_this = 0x81bf7caa0
        execute_data = {opline = 0x0, function_state = {function = 0x81bed8888, 
arguments = 0x805adbd90}, fbc = 0x0, called_scope = 0x0, op_array = 0x0,
          object = 0x81bf8d230, Ts = 0x805adbac0, CVs = 0x805adbaa0, 
symbol_table = 0x0, prev_execute_data = 0x805adba10, old_error_reporting = 0x0,
          nested = 0 '\000', original_return_value = 0x0, current_scope = 
0x81bf8ad40, current_called_scope = 0x81bf89300, current_this = 0x81bf7caa0,
          current_object = 0x0}
        fci_cache_local = {initialized = 48 '0', function_handler = 0x1, 
calling_scope = 0x81bf8d230, called_scope = 0x805adb330, object_ptr = 0x1}
#7719 0x000000080247d07f in zif_call_user_func (ht=<optimized out>, 
return_value=0x81c346c60, return_value_ptr=<optimized out>, this_ptr=<optimized 
out>,
    return_value_used=<optimized out>) at /php-
5.4.9/ext/standard/basic_functions.c:4729
        retval_ptr = 0x0
        fci = {size = 72, function_table = 0x81bed8668, function_name = 
0x81c346718, symbol_table = 0x0, retval_ptr_ptr = 0x7fffffffc808,
          param_count = 0, params = 0x0, object_ptr = 0x81bf8d230, no_separation 
= 1 '\001'}
        fci_cache = {initialized = 1 '\001', function_handler = 0x81bed8888, 
calling_scope = 0x81bed8640, called_scope = 0x81bed8640,
          object_ptr = 0x81bf8d230}
#7720 0x00000008025a3c85 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805adba10)
    at /php-5.4.9/Zend/zend_vm_execute.h:642
        ret = 0x805adbbe0
        opline = 0x81025e3b0
        should_change_scope = 0 '\000'
        fbc = 0x805b47700

#7721 0x00000008025a9bb2 in execute (op_array=0x81bf8c7d0) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805adba10
        nested = 0 '\000'
        original_in_execution = 1 '\001'
#7722 0x00000008025a3f90 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x805adb350)
    at /php-5.4.9/Zend/zend_vm_execute.h:669
        opline = 0x810242f68
        should_change_scope = 1 '\001'
        fbc = 0x81bf8c7d0
#7723 0x00000008025a9bb2 in execute (op_array=0x81bfa8338) at /php-
5.4.9/Zend/zend_vm_execute.h:410
        ret = <optimized out>
        execute_data = 0x805adb350
        nested = 0 '\000'
        original_in_execution = 0 '\000'
#7724 0x000000080257558b in zend_execute_scripts (type=8, retval=0x0, 
file_count=3) at /php-5.4.9/Zend/zend.c:1309
        files = {{gp_offset = 40, fp_offset = 0, overflow_arg_area = 
0x7fffffffcb90, reg_save_area = 0x7fffffffcaa0}}
        i = 1
        file_handle = 0x7fffffffe170
        orig_op_array = 0x0
        orig_retval_ptr_ptr = 0x0
#7725 0x00000008025165a7 in php_execute_script (primary_file=0x7fffffffe170) at 
/php-5.4.9/main/main.c:2482
        realfile = 
"\360\333\377\377\377\177\000\000h\211\314\033\b\000\000\000\020\334\377\377\000
\000\000\000\200\334\377\377\000\000\000\000\020\334\377\377\377\177\000\000\365
\001\b\000\000\000\000\377\314\033\b\000\000\000\200\334\377\377\377\177\000\000
\320\334\377\377\377\177\000\000\020\226\206\001\b", '\000' <repeats 12 
times>"\335, \377\377\377\177\000\000\220\335\377\377\377\177\000\000 
\211\314\033\b\000\000\000\030\024\315\033\b\000\000\000\310l\266\001\b\000\000\
000\340\020\315\033\b\000\000\000\217\334\377\377\377\177\000\000\220\334\377\37
7\377\177\000\000\372\231\207\001\b\000\000\000\340\005\315\033\b\000\000\000X\3
35\377\377\377\177\000\000\200b\017\001\b\000\000\000\300\334\377\377\377\177\00
0\000\240b\017\001\b\000\000\000\000\001\000\000\000\000\000\000X\370\260\005\b\
000\000\000\000\002\000\000\000\000\000\000\260\005\261\005\b\000\000\000\000\22
3\317\005\b\000\000\000\020\002\000\000\000\000\000\000\250#\261\005\b\000\000\0
00\260\005\261\005\b\000\000\000\017\022U\002\b\000\000\000(\305)\347\265\b\255\
262\260\005\b\000\000\000GX\270\035\343\236g\206\000\000\000\000\000\000\000\000
\307"...
        __orig_bailout = 0x7fffffffe1f0
        __bailout = {{_sjb = {34398626970, 34407231968, 140737488341896, 
140737488347472, 34826363040, 0, 34826179216, 0, 34407187071, 34826363040,
              34407230688, 34359738368}}}
        prepend_file_p = 0x0
        append_file_p = 0x1df4
        prepend_file = {type = ZEND_HANDLE_FILENAME, filename = 0x0, opened_path 
= 0x0, handle = {fd = 0, fp = 0x0, stream = {handle = 0x0, isatty = 0,
              mmap = {len = 0, pos = 0, map = 0x0, buf = 0x0, old_handle = 0x0, 
old_closer = 0x0}, reader = 0x0, fsizer = 0x0, closer = 0x0}},
          free_filename = 0 '\000'}
        append_file = {type = ZEND_HANDLE_FILENAME, filename = 0x0, opened_path 
= 0x0, handle = {fd = 0, fp = 0x0, stream = {handle = 0x0, isatty = 0,
              mmap = {len = 0, pos = 0, map = 0x0, buf = 0x0, old_handle = 0x0, 
old_closer = 0x0}, reader = 0x0, fsizer = 0x0, closer = 0x0}},
          free_filename = 0 '\000'}
        old_cwd = 0x7fffffffcba0 "/"
        retval = 0
#7726 0x000000080261d292 in php_handler (r=0x81bd020a0) at /php-
5.4.9/sapi/apache2handler/sapi_apache2.c:667
        zfd = {type = ZEND_HANDLE_FILENAME, filename = 0x81bd2b560 
"/var/www/html/webmail/services/ajax.php", opened_path = 0x0, handle = {fd = 0,
            fp = 0x0, stream = {handle = 0x0, isatty = 0, mmap = {len = 0, pos = 
0, map = 0x0, buf = 0x0, old_handle = 0x0, old_closer = 0x0},
              reader = 0x0, fsizer = 0x0, closer = 0x0}}, free_filename = 0 
'\000'}
        __bailout = {{_sjb = {34399702360, 34450510960, 140737488347480, 16, 
34826363040, 0, 34826179216, 0, 895, 0, 140737488347760, 34359738368}}}
        ctx = 0x81bd06de0
        conf = 0x81bcfe418
        brigade = 0x81bd00d98
        bucket = <optimized out>
        rv = <optimized out>
        parent_req = 0x0


And the last execute:
(gdb) frame 7723
#7723 0x00000008025a9bb2 in execute (op_array=0x81bfa8338) at /php-
5.4.9/Zend/zend_vm_execute.h:410
410                     if ((ret = OPLINE->handler(execute_data TSRMLS_CC)) > 0) 
{