RE: [PHP] Segmentation fault problem

Martin Luethi Fri, 23 Jan 2004 03:36:10 -0800

the function who is causing the seg fault is preg_match_all

maybe this helps (http://bugs.php.net/bug.php?id=20698):
[28 Nov 2002 6:26am EST] thingol at mail dot ru
If the text for preg_match_all is bigger than some value, many regexp
constructions causes php to terminate.

This code crashes php (on win32 only):

<?
$thi = str_repeat("aaaaaaa   a aa aa aa\n", 1000);
preg_match_all("/(.|\n)*/",$thi,$vars);
?>
[28 Nov 2002 7:06am EST] [EMAIL PROTECTED]
Not really a PHP bug; bug is in the PCRE library itself
and is because you are asking it to capture a very large
number of individual character matches.
Increasing your stack size might help (ulimit).

g. martin luethi

Thu, 22 Jan 2004 14:20:56 -0500 "E. Stuart Hicks" <[EMAIL PROTECTED]>:

Please disregard my last post - I'd switched Apache back from the debug
module for the night and forgotten to turn it back on.

I've attached the full trace but here's the main part:

(gdb) print (char
*)(executor_globals.function_state_ptr->function)->common.function_name
$4 = 0xffffffff7bb69250 "preg_match_all"
(gdb) frame 8
#8  0xffffffff7baeabe4 in execute (op_array=0x1003a07d0) at
/root/build/php-4.3.4/Zend/zend_execute.c:1660
1660
zend_execute(EG(active_op_array) TSRMLS_CC);
(gdb) frame 9
#9  0xffffffff7baeabe4 in execute (op_array=0x1003af0c0) at
/root/build/php-4.3.4/Zend/zend_execute.c:1660
1660
zend_execute(EG(active_op_array) TSRMLS_CC);
(gdb) frame 10
#10 0xffffffff7baeabe4 in execute (op_array=0x10038f230) at
/root/build/php-4.3.4/Zend/zend_execute.c:1660
1660
zend_execute(EG(active_op_array) TSRMLS_CC);
(gdb) frame 11
#11 0xffffffff7bacde24 in zend_execute_scripts (type=8, retval=0x0,
file_count=3)
    at /root/build/php-4.3.4/Zend/zend.c:884
884                             zend_execute(EG(active_op_array) TSRMLS_CC);
(gdb) frame 12
#12 0xffffffff7ba6dd08 in php_execute_script
(primary_file=0xffffffff7fffef20)
    at /root/build/php-4.3.4/main/main.c:1729
1729                    retval = (zend_execute_scripts(ZEND_REQUIRE
TSRMLS_CC, NULL, 3, prepend_file_p, primary_file, append_file_p) ==
SUCCESS);

Stu


-----Original Message-----
From: E. Stuart Hicks [mailto:[EMAIL PROTECTED]
Sent: Thursday, January 22, 2004 2:07 PM
To: 'Martin Luethi'; [EMAIL PROTECTED]
Subject: RE: [PHP] Segmentation fault problem

I still can't access anything on bugs.php.net so I'm not sure exactly what
you need.  I grabbed all of the execute() frames, though, and ran that print
function and got this:

(gdb) print (char
*)(executor_globals.function_state_ptr->function)->common.function_name
Attempt to extract a component of a value that is not a structure.
(gdb) frame 6
#6  0xffffffff7babef00 in execute () from /home/httpd/modules/libphp4.so
(gdb) frame 7
#7  0xffffffff7babf244 in execute () from /home/httpd/modules/libphp4.so
(gdb) frame 8
#8  0xffffffff7babf244 in execute () from /home/httpd/modules/libphp4.so
(gdb) frame 9
#9  0xffffffff7babf244 in execute () from /home/httpd/modules/libphp4.so
(gdb) frame 10
#10 0xffffffff7babf244 in execute () from /home/httpd/modules/libphp4.so

Does this help?

Stu


-----Original Message-----
From: Martin Luethi [mailto:[EMAIL PROTECTED]
Sent: Thursday, January 22, 2004 2:24 AM
To: [EMAIL PROTECTED]
Subject: Re: [PHP] Segmentation fault problem

each php function is executed by the internal function "execute()"
please include the details about this frames also (configure php with
--enable-debug first) e.g.:
(gdb) frame 6
output...
(gdb) print (char *)(executor_globals.function_state_ptr->function)-

common.function_name

output...

with this information you can see which php-command causing the seg fault
-> http://bugs.php.net/bugs-generating-backtrace.php

g. martin luethi

Program received signal SIGSEGV, Segmentation fault.
0xffffffff7bacedcc in zend_parse_arg_impl (arg=0x1003853c0,
va=0xffffffff7ffe3a88, spec=0xffffffff7ffe3a58)
at /root/build/php-4.3.4/Zend/zend_API.c:259
259                                                     *p =

Z_LVAL_PP(arg);

(gdb) bt
#0  0xffffffff7bacedcc in zend_parse_arg_impl (arg=0x1003853c0,
va=0xffffffff7ffe3a88, spec=0xffffffff7ffe3a58)
at /root/build/php-4.3.4/Zend/zend_API.c:259
#1  0xffffffff7bacfa54 in zend_parse_arg (arg_num=4, arg=0x1003853c0,
va=0xffffffff7ffe3a88,
spec=0xffffffff7ffe3a58, quiet=0) at
/root/build/php-4.3.4/Zend/zend_API.c:439
#2  0xffffffff7bacff40 in zend_parse_va_args (num_args=0,
type_spec=0xffffffff7bb6906c "ll",
va=0xffffffff7ffe3a88, flags=0) at
/root/build/php-4.3.4/Zend/zend_API.c:524
#3  0xffffffff7bad032c in zend_parse_parameters (num_args=4,
type_spec=0xffffffff7bb69068 "ssz|ll")
at /root/build/php-4.3.4/Zend/zend_API.c:551
#4  0xffffffff7b9493cc in php_pcre_match (ht=4, return_value=0x1008c4c00,
this_ptr=0x0, return_value_used=0,
global=1) at /root/build/php-4.3.4/ext/pcre/php_pcre.c:375
#5  0xffffffff7b94a464 in zif_preg_match_all (ht=4,
return_value=0x1008c4c00, this_ptr=0x0, return_value_used=0)
at /root/build/php-4.3.4/ext/pcre/php_pcre.c:608
#6  0xffffffff7baea870 in execute (op_array=0x1008ac610) at
/root/build/php-4.3.4/Zend/zend_execute.c:1616
#7  0xffffffff7baeabe4 in execute (op_array=0x100884bd0) at
/root/build/php-4.3.4/Zend/zend_execute.c:1660
#8  0xffffffff7baeabe4 in execute (op_array=0x1003a07b0) at
/root/build/php-4.3.4/Zend/zend_execute.c:1660
#9  0xffffffff7baeabe4 in execute (op_array=0x1003af0a0) at
/root/build/php-4.3.4/Zend/zend_execute.c:1660
#10 0xffffffff7baeabe4 in execute (op_array=0x10038f220) at
/root/build/php-4.3.4/Zend/zend_execute.c:1660
#11 0xffffffff7bacde24 in zend_execute_scripts (type=8, retval=0x0,
file_count=3)
at /root/build/php-4.3.4/Zend/zend.c:884
#12 0xffffffff7ba6dd08 in php_execute_script
(primary_file=0xffffffff7fffef30)
at /root/build/php-4.3.4/main/main.c:1729
#13 0xffffffff7baf3914 in php_handler (r=0x10037df10)
at /root/build/php-4.3.4/sapi/apache2handler/sapi_apache2.c:537
#14 0x00000001000ac8a0 in ap_run_handler ()
#15 0x00000001000ad798 in ap_invoke_handler ()
#16 0x000000010007b6d0 in ap_process_request ()
#17 0x00000001000712e4 in ap_process_http_connection ()
#18 0x00000001000c55b8 in ap_run_process_connection ()
#19 0x00000001000c5c18 in ap_process_connection ()
#20 0x00000001000a8e28 in child_main ()
#21 0x00000001000a9030 in make_child ()
#22 0x00000001000a92a4 in startup_children ()
#23 0x00000001000a9da8 in ap_mpm_run ()
#24 0x00000001000b79d8 in main ()
(gdb) quit
[EMAIL PROTECTED] httpd]

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RE: [PHP] Segmentation fault problem

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