ID: 43136
Updated by: [EMAIL PROTECTED]
Reported By: [EMAIL PROTECTED]
-Status: Assigned
+Status: Closed
Bug Type: Scripting Engine problem
Operating System: Linux 64bit
PHP Version: 4.4.7
Assigned To: dmitry
New Comment:
Fixed in CVS HEAD and PHP_5_3.
Previous Comments:
------------------------------------------------------------------------
[2007-11-08 12:54:14] [EMAIL PROTECTED]
Probably the crash occurs because of wrong value in EG(opline_ptr).
In zend_do_fcall_common_helper() EG(opline_ptr) is inconsistent after
call to zend_execute() and restoring it by EG(opline_ptr) =
&EX(opline);
If the timeout occurs while EG(opline_ptr) is inconsistent, it may
crash php.
EG(active_op_array) has exactly the same problem.
------------------------------------------------------------------------
[2007-10-30 08:47:32] [EMAIL PROTECTED]
Assigning to Dmitry at his request.
------------------------------------------------------------------------
[2007-10-30 08:45:23] [EMAIL PROTECTED]
Description:
------------
The crash is really rare, but seems to be possible.
According to the core, it happened when script execution timed out and
active_opline pointer was NULL at that moment, so
zend_get_executed_lineno() tried to dereference NULL ptr.
Even though the backtrace mentions Zend Opimizer, it doesn't seem to be
required to reproduce the crash and it is not PHP4 specific.
Reproduce code:
---------------
.
Expected result:
----------------
.
Actual result:
--------------
(gdb) bt
#0 0x000000000052d7d1 in zend_get_executed_lineno () at
/shared/misc/standard/php.src/php-4.4.7/Zend/zend_execute_API.c:269
#1 0x0000000000536c4b in zend_error (type=1, format=0x6ce4b8 "Maximum
execution time of %d second%s exceeded")
at /shared/misc/standard/php.src/php-4.4.7/Zend/zend.c:760
#2 <signal handler called>
#3 0x0000002a97194f2b in zend_optimizer_set_oe_ex () from
/local/Zend/lib/php-4.4.x/ZendOptimizer.so
#4 0x0000002a97194f16 in zend_optimizer_set_oe_ex () from
/local/Zend/lib/php-4.4.x/ZendOptimizer.so
#5 0x0000002a97194f16 in zend_optimizer_set_oe_ex () from
/local/Zend/lib/php-4.4.x/ZendOptimizer.so
#6 0x0000002a97194f16 in zend_optimizer_set_oe_ex () from
/local/Zend/lib/php-4.4.x/ZendOptimizer.so
#7 0x0000002a97194f16 in zend_optimizer_set_oe_ex () from
/local/Zend/lib/php-4.4.x/ZendOptimizer.so
#8 0x00000000005365bf in zend_execute_scripts (type=8, retval=0x0,
file_count=3) at
/shared/misc/standard/php.src/php-4.4.7/Zend/zend.c:939
#9 0x00000000004fe699 in php_execute_script
(primary_file=0x7fbffffb20) at
/shared/misc/standard/php.src/php-4.4.7/main/main.c:1784
#10 0x0000000000557bfd in main (argc=5, argv=0x7fbffffc78) at
/shared/misc/standard/php.src/php-4.4.7/sapi/cgi/cgi_main.c:2236
Further investigation has shown that active_opline is NULL:
(gdb) f 0
#0 0x000000000052d7d1 in zend_get_executed_lineno () at
/shared/misc/standard/php.src/php-4.4.7/Zend/zend_execute_API.c:269
269
/shared/misc/standard/php.src/php-4.4.7/Zend/zend_execute_API.c: No such
file or directory.
in
/shared/misc/standard/php.src/php-4.4.7/Zend/zend_execute_API.c
(gdb) p executor_globals.opline_ptr
$3 = (zend_op **) 0x7fbfff9510
(gdb) p *executor_globals.opline_ptr
$4 = (zend_op *) 0x0
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/?id=43136&edit=1
