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Bug #58121 Non-deterministic blank pages when navigating a MediaWiki site
Submitted: 2008-03-26 08:58 UTC Modified: 2008-03-28 15:55 UTC
From: jldupont@php.net Assigned:
Status: Closed Package: APC (PECL)
PHP Version: 5.2.4 OS: FC4
Private report: No CVE-ID: None
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 [2008-03-26 08:58 UTC] jldupont@php.net 
Description:
------------
I get non-deterministic blank-pages after a couple of hits on my MediaWiki v1.11.0 install running PHP 5.2.4 on a 1and1 VPS FC4.

The site used to run very fine with APC v3.0.16 on PHP 5.2.4.

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 [2008-03-26 09:42 UTC] gopalv82 at yahoo dot com 
Would you like the security fix to 3.0.16, without the rest of the fixes?

And what does your cache full count say?
 [2008-03-26 12:44 UTC] aturner at godaddy dot com 
I'm running PHP 5.2.4 on Linux Fedora Core 7 and PHP 5.2.3 on FreeBSD, and 3.0.17 breaks every page after APC caches it.  The following errors were in my Apache error logs:

zend_mm_heap corrupted
[Wed Mar 26 13:32:57 2008] [notice] child pid 18103 exit signal Segmentation fault (11)
zend_mm_heap corrupted
...

I believe this is related.
 [2008-03-26 13:13 UTC] email at steffenweber dot net 
I'm seeing those "zend_mm_heap corrupted" messages, too. For example in phpMyAdmin, in Horde IMP and in our homegrown CMS. We are running PHP 5.2.6-rc1 on x86_64 (Gentoo). APC 3.0.16 works fine. APC 3.0.16 + Security Fix from 3.0.17 works fine. But APC 3.0.17 shows the mentioned error messages in Apache's error log.
 [2008-03-26 15:19 UTC] jbyers at jbyers dot com 
Same situation.  PHP 5.2.4, RHEL4-64, fastcgi.  3.0.16 is stable, 3.0.17 has frequent mm_heap_corruption segfaults on an empty cache.  It would take some time to generate a backtrace, but I can provide one if needed.

Please do post the CVE-2008-1488 patch against 3.0.16 -- maybe also in the original bug thread, #13415.  I did the same as others here and back-ported the patch from .17, but an official patch would reassure me I didn't misunderstand what that strlcpy needed to do. :)
 [2008-03-26 17:24 UTC] gehrig at ishd dot de 
Same problem here...
PHP 5.2.4, get "zend_mm_heap corrupted" in Apache logfile when running APC 3.0.17. Switching back to APC 3.0.16 corrects the problem.
 [2008-03-26 18:08 UTC] email at steffenweber dot net 
@jbyers: I have used the following patch: http://steffenweber.net/files/apc-cve-2008-1488.diff (MD5 9c12c61f0980ef637a7213bf99145a27)

Please note that I have just tried to make Rasmus' patch (http://cvsweb.php.net/viewvc.cgi/pecl/apc/apc.c?r1=3.20&r2=3.21) work with APC 3.0.16. I'm not really a C programmer.
 [2008-03-27 01:54 UTC] tom at fpsbanana dot com 
I just filed a similar bug report. Log into your shell and check your aborted_clients MySQL variable.

> mysql
 > SHOW STATUS;
 [2008-03-27 05:47 UTC] gopalv82 at yahoo dot com 
People, people ... I may have done something stupid in the merge.

Please test APC cvs HEAD to confirm that I did do bad or whether 3.1.x is going to b0rked as well. The quicker we know, the better.

cvs -d :pserver:cvsread@cvs.php.net:/repository checkout pecl/apc

phpize && ./configure && make

sudo make install

(while, I read the code merges all over again)
 [2008-03-27 12:14 UTC] vincent at applesolutions dot com 
CVS head exhibits the same behavior on the PHP 5.2.3/FreeBSD case mentioned earlier.
 [2008-03-28 06:40 UTC] email at steffenweber dot net 
I have just checked out CVS head using Gopals instructions five minutes ago and see "zend_mm_heap corrupted" messages in the logs, too.
 [2008-03-28 06:47 UTC] gopalv82 at yahoo dot com 
Thank you, I'll update CVS HEAD in the hour with a possible fix.
 [2008-03-28 09:03 UTC] gopalv82 at yahoo dot com 
Mind testing, 

http://t3.dotgnu.info/code/apc-3.0.18-RC.patch

on top of 3.0.17? 

(and thanks for the debugging & testing CVS HEAD)
 [2008-03-28 10:18 UTC] email at steffenweber dot net 
On first glance this patch seems to fix the bug. I'll report back later when I'm a little more confident. :)
 [2008-03-28 11:50 UTC] email at steffenweber dot net 
For me, the problem is definately gone with your patch. Thank you very much!
 [2008-03-28 15:55 UTC] rasmus@php.net 
Should be fixed in 3.0.18 now.
 
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