ID: 46753 User updated by: essen at dev-extend dot eu Reported By: essen at dev-extend dot eu -Status: No Feedback +Status: Open Bug Type: Scripting Engine problem Operating System: Linux Ubuntu 8.10 PHP Version: 5.2CVS-2008-12-08 New Comment:
Okay I've narrowed down the bug a bit. First, the crash do not happen in PHP 5.3 using the latest snapshot. Second, I've tried to make a small example and failed. So I made all the files involved available here: http://blog.extend.ws/~essen/bug46753.tar.gz I've changed a few things in the code to make it more friendly to an environment without some specific extensions, all you need is mysql and xsl. You need however to create a database (a script is available in app/sql). The configuration for the database can be changed in app/conf/wee.cnf. There is a hack in the index.php file to make it usable from the command line. If you want to use it from a browser, remove the line and point your browser to index.php/toppage/add instead. If everything goes well, you should have an error message instead of nothing and a segfault. One last thing. I've let the .svn directory in wee/db/meta/mysql in the archive. The crash doesn't happen if you remove this specific directory. Other directories were removed for this archive. Previous Comments: ------------------------------------------------------------------------ [2008-12-16 01:00:00] php-bugs at lists dot php dot net No feedback was provided for this bug for over a week, so it is being suspended automatically. If you are able to provide the information that was originally requested, please do so and change the status of the bug back to "Open". ------------------------------------------------------------------------ [2008-12-08 22:35:36] j...@php.net Please try isolate the code. As short as possible script. You should also try the PHP 5.3 snapshot: http://snaps.php.net/php5.3- latest.tar.gz just in case this same issue is already fixed there.. ------------------------------------------------------------------------ [2008-12-08 17:31:15] essen at dev-extend dot eu Exactly the same problem using the snapshot. The problem also occurs from the command line (both on 5.2.6 and using the snapshot). The "bt full" made using this snapshot is available at the following address: http://blog.extend.ws/~essen/bug46753btfull.txt I can try to isolate the code leading to the segfault if you need it, but it's not going to be an easy task as it crashes inside classes querying metadata information from a MySQL database, and also because the same code works without problem for a different page. ------------------------------------------------------------------------ [2008-12-08 11:34:58] j...@php.net Please try using this CVS snapshot: http://snaps.php.net/php5.2-latest.tar.gz For Windows: http://windows.php.net/snapshots/ ------------------------------------------------------------------------ [2008-12-05 00:23:16] essen at dev-extend dot eu Description: ------------ I encountered a strange crash. I can reproduce it, it always happens, but only under very specific conditions. It first happened when I changed a completely unrelated part of my code in a different file of the project. PHP crash on an is_subclass_of call. This call worked correctly before my changes, and still works correctly on the other pages. Other is_subclass_of works fine too. I'm not sure what trigger this, as I've only changed a few methods, nothing changing the outcome of the script... Another thing. If I add a require_once before the is_subclass_of call, there is no crash. The crash only happens when the class isn't defined in the current script, which should and does trigger the autoload callback to load the class. The class is successfully loaded by the callback, the crash happens only after. I'm not sure what more can I say. If you need further details, feel free to ask. Actual result: -------------- Core was generated by `/usr/sbin/apache2 -k start'. Program terminated with signal 11, Segmentation fault. [New process 19175] #0 0xb72c372a in is_a_impl (ht=-47466807, return_value=0xb9a602b0, return_value_ptr=0x0, this_ptr=0x0, return_value_used=1, only_subclass=1 '\001') at /build/buildd/php5-5.2.6/Zend/zend_builtin_functions.c:657 657 /build/buildd/php5-5.2.6/Zend/zend_builtin_functions.c: No such file or directory. in /build/buildd/php5-5.2.6/Zend/zend_builtin_functions.c (gdb) bt #0 0xb72c372a in is_a_impl (ht=-47466807, return_value=0xb9a602b0, return_value_ptr=0x0, this_ptr=0x0, return_value_used=1, only_subclass=1 '\001') at /build/buildd/php5-5.2.6/Zend/zend_builtin_functions.c:657 #1 0xb72ecba3 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf854fd8) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:200 #2 0xb72d803b in execute (op_array=0xb9a5c364) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #3 0xb72ec466 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf8552b8) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:234 #4 0xb72d803b in execute (op_array=0xb9a5bb8c) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #5 0xb72ec466 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf8555c8) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:234 #6 0xb72d803b in execute (op_array=0xb99d71b0) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #7 0xb72ec466 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf855e18) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:234 #8 0xb72d803b in execute (op_array=0xb9a17614) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #9 0xb72ec466 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf856248) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:234 #10 0xb72d803b in execute (op_array=0xb9a17d94) ---Type <return> to continue, or q <return> to quit--- at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #11 0xb72ec466 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf8565d8) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:234 #12 0xb72d803b in execute (op_array=0xb9a06ca0) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #13 0xb72ec466 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf856a08) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:234 #14 0xb72d803b in execute (op_array=0xb9a0d344) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #15 0xb72ec466 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf856cf8) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:234 #16 0xb72d803b in execute (op_array=0xb99f1c8c) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #17 0xb72ec466 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf856ef8) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:234 #18 0xb72d803b in execute (op_array=0xb99f2968) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #19 0xb72ec466 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf857328) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:234 #20 0xb72d803b in execute (op_array=0xb9a04ab4) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #21 0xb72ec466 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf857568) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:234 ---Type <return> to continue, or q <return> to quit--- #22 0xb72d803b in execute (op_array=0xb99e5de0) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #23 0xb72ec466 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf857998) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:234 #24 0xb72d803b in execute (op_array=0xb99e60b0) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #25 0xb72ec466 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf857bb8) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:234 #26 0xb72d803b in execute (op_array=0xb9974038) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #27 0xb72ec466 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf8581e8) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:234 #28 0xb72d803b in execute (op_array=0xb97c5384) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #29 0xb72ec466 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf858468) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:234 #30 0xb72d803b in execute (op_array=0xb97abbe8) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 #31 0xb72b26e0 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /build/buildd/php5-5.2.6/Zend/zend.c:1215 #32 0xb726704a in php_execute_script (primary_file=0xbf85a728) at /build/buildd/php5-5.2.6/main/main.c:2026 #33 0xb732a7f0 in php_handler (r=0xb98dd238) ---Type <return> to continue, or q <return> to quit--- at /build/buildd/php5-5.2.6/sapi/apache2handler/sapi_apache2.c:648 #34 0xb803730d in ap_run_handler () from /usr/sbin/apache2 #35 0xb803af2f in ap_invoke_handler () from /usr/sbin/apache2 #36 0xb804a190 in ap_internal_redirect () from /usr/sbin/apache2 #37 0xb6ff6743 in ?? () from /usr/lib/apache2/modules/mod_rewrite.so #38 0xb803730d in ap_run_handler () from /usr/sbin/apache2 #39 0xb803af2f in ap_invoke_handler () from /usr/sbin/apache2 #40 0xb804a361 in ap_process_request () from /usr/sbin/apache2 #41 0xb8046f78 in ?? () from /usr/sbin/apache2 #42 0xb803f6fd in ap_run_process_connection () from /usr/sbin/apache2 #43 0xb804f781 in ?? () from /usr/sbin/apache2 #44 0xb804fb23 in ?? () from /usr/sbin/apache2 #45 0xb8050442 in ap_mpm_run () from /usr/sbin/apache2 #46 0xb80220e9 in main () from /usr/sbin/apache2 (gdb) print (char *)(executor_globals.function_state_ptr->function)->common.function_name $1 = 0xb74f294f "is_subclass_of" (gdb) frame 30 #30 0xb72d803b in execute (op_array=0xb97abbe8) at /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h:92 92 /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h: No such file or directory. in /build/buildd/php5-5.2.6/Zend/zend_vm_execute.h (gdb) print (char *)(executor_globals.function_state_ptr->function)->common.function_name $2 = 0xb74f294f "is_subclass_of" (All the execute returns is_subclass_of.) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=46753&edit=1
