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Ticket Resolution Summary Owner Reporter
#65 fixed Cannot redeclare class moo coredump

I'm getting the following error message in the Apache error log while running vBulletin 3.6.4.

PHP Fatal error:  Cannot redeclare class vb_datamanager_user
 in /home/path-removed/includes/class_dm_user.php on line 31, referer: http://domain-removed/showthread.php?t=13755

A snippet from class_dm_user.php looks like:

if (!class_exists('vB_DataManager'))

define('SALT_LENGTH', 3);

class vB_DataManager_User extends vB_DataManager # <- line #31

#66 invalid debug_backtrace + array_shift = crash moo moo

(reported by Vyacheslav Chernousov)

Hi! Sorry for disturbing your by email, but actually the question is urgent.

One of my customers has server, where I installed xcache. It is dual Xeon with 2GB RAM, CentOS release 4.4 (Final). I installed lighttpd, php 5.1.6 and xcache (--enable-xcache --enable-xcache-optimizer). Mostly all works stable, but suddenly I found the unexpected behaviour when executing this code:

$trace = debug_backtrace(); array_shift($trace);

on the 2nd line php crashes. When I turn OFF xcache - all works good. Strace shows me:

brk(0x9cba000) = 0x9cba000
mmap2(NULL, 135168, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb680e000
munmap(0xb680e000, 135168) = 0
brk(0x9caa000) = 0x9caa000
brk(0x9c9a000) = 0x9c9a000
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
Process 2832 detached

I tried to use different xcache releases - from 1.2 till latest 2.0 (from svn) and no success with any revision.

php.ini part:

zend_extension = /usr/lib/php/extensions/no-debug-non-zts-20060613/



xcache.var_gc_interval = 1
xcache.gc_interval = 1

Setting both xcache.cacher and xcache.optimizer to zero doesn't help. Only commenting "zend_extension = ..." helps ;(

The main problem is that we are going to launch new site on this server in a day or two and we can't to it without xcache and in the same time we can't launch it with this segfault. I very need your help asap and and I'm ready to provide root access to this server for you to found and fix this bug. Please contact me by email as soon as possible.

Thank you in advance!

#67 fixed php fatal errors moo creole


I emerged dev-php/xcache-9999 (XCache v2.0.0-dev) with php 4.4.4-pl8-gentoo and get the following errors in moodle:

Fatal error: Cannot redeclare class question_dataset_dependent_questiontype in /www/ on line 13

Fatal error: Call to undefined function: _adodb_getinsertsql() in /www/ on line 1893

I had no problems with the previous version (I guess that was XCache v1.0 which is no longer in the portage tree)

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