#25107 [Com]: list class produces segfaults

ID: 25107 Comment by: wagner at globalpark dot de Reported By: mop at globalpark dot de Status: Bogus Bug Type: Reproducible crash Operating System: Linux PHP Version: 5.0.0b1 (beta1) New Comment: Whatever a script does, PHP should never ever crash. A fatal error is ok, a segfault is not. Even if a recursion with a depth of 40000 is something PHP can't handle, this bug is IMO not bogus. Previous Comments: ------------------------------------------------------------------------ [2003-08-16 16:00:02] derick@php.net 40.000 is too much anyway, try this in C, it will most likely crash too. There is just a finite amount of stack memory available which you simply can not exceed or a program will crash. This is not a bug, but a different (and IMO wrong) way of programming... . I suggest to try iteration instead of recursion. ------------------------------------------------------------------------ [2003-08-16 15:43:55] mop at globalpark dot de it is NOT infinite....it is just a long recursion because i am creating a really long list (40000 objects in this case). once the list is complete i want to move to the begin of the list. which means to enter that function 40000 times. when you try it with for example 10 entries it works like a charm. ------------------------------------------------------------------------ [2003-08-16 10:32:30] derick@php.net Sorry, but your problem does not imply a bug in PHP itself. For a list of more appropriate places to ask for help using PHP, please visit http://www.php.net/support.php as this bug system is not the appropriate forum for asking support questions. Thank you for your interest in PHP. You have infinite recursion in your program as you can see from the backtrace. PHP will not catch this, and it's clearly a problem on your side. ------------------------------------------------------------------------ [2003-08-16 06:55:39] mop at globalpark dot de Description: ------------ I could reproduce that on two different computers and with latest cvs. the only difference was the number of correct operations. -------snip------ begin 2819 begin 2820 begin 2821 begin 2822 begin 2823 begin 2824 Speicherzugriffsfehler -------snip------ the other computer: ------snip------ begin 11626 begin 11627 begin 11628 begin 11629 begin 11630 begin 11631 begin 11632 Segmentation fault ------snip------ these values are always the same on these enviroments. configure: configure --prefix=/usr/local/php5 --with-mysql=/usr/local on the second computer i disabled the whole xml stuff. that's the only difference. Reproduce code: --------------- http://www.spaceregents.de/containertest.phps Expected result: ---------------- $container should point to the first listelement Actual result: -------------- Segfault Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 16384 (LWP 6450)] 0x401caab0 in thread_self () from /lib/libpthread.so.0 (gdb) bt #0 0x401caab0 in thread_self () from /lib/libpthread.so.0 #1 0x401caa7b in __errno_location () from /lib/libpthread.so.0 #2 0x40252d81 in vfprintf () from /lib/libc.so.6 #3 0x4026d386 in vsprintf () from /lib/libc.so.6 #4 0x4025c21a in sprintf () from /lib/libc.so.6 #5 0x0814819c in _convert_to_string (op=0xbfe017a0) at /usr/local/download/php-5.0.0b1/Zend/zend_operators.c:507 #6 0x0814c303 in zend_make_printable_zval (expr=0x8217864, expr_copy=0xbfe017a0, use_copy=0xbfe01798) at /usr/local/download/php-5.0.0b1/Zend/zend.c:248 #7 0x0814a19c in concat_function (result=0xbfe018b0, op1=0x8218e38, op2=0x8217864) at /usr/local/download/php-5.0.0b1/Zend/zend_operators.c:1100 #8 0x0815cb55 in zend_concat_handler (execute_data=0xbfe01a30, op_array=0x82177cc) at /usr/local/download/php-5.0.0b1/Zend/zend_execute.c:1344 #9 0x0815c5c8 in execute (op_array=0x82177cc) at /usr/local/download/php-5.0.0b1/Zend/zend_execute.c:1254 #10 0x0816005b in zend_do_fcall_common_helper (execute_data=0xbfe01d10, op_array=0x82177cc) at /usr/local/download/php-5.0.0b1/Zend/zend_execute.c:2635 #11 0x0816028d in zend_do_fcall_by_name_handler (execute_data=0xbfe01630, op_array=0x82177cc) at /usr/local/download/php-5.0.0b1/Zend/zend_execute.c:2703 #12 0x0815c5c8 in execute (op_array=0x82177cc) at /usr/local/download/php-5.0.0b1/Zend/zend_execute.c:1254 #13 0x0816005b in zend_do_fcall_common_helper (execute_data=0xbfe01ff0, op_array=0x82177cc) at /usr/local/download/php-5.0.0b1/Zend/zend_execute.c:2635 #14 0x0816028d in zend_do_fcall_by_name_handler (execute_data=0xbfe01630, op_array=0x82177cc) at /usr/local/download/php-5.0.0b1/Zend/zend_execute.c:2703 #15 0x0815c5c8 in execute (op_array=0x82177cc) at /usr/local/download/php-5.0.0b1/Zend/zend_execute.c:1254 #16 0x0816005b in zend_do_fcall_common_helper (execute_data=0xbfe022d0, op_array=0x82177cc) at /usr/local/download/php-5.0.0b1/Zend/zend_execute.c:2635 #17 0x0816028d in zend_do_fcall_by_name_handler (execute_data=0xbfe01630, op_array=0x82177cc) at /usr/local/download/php-5.0.0b1/Zend/zend_execute.c:2703 #18 0x0815c5c8 in execute (op_array=0x82177cc) at /usr/local/download/php-5.0.0b1/Zend/zend_execute.c:1254 [...] ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=25107&edit=1