Bug #71135 [Com]: Random memory corruption with strings

From: Date: Mon, 28 Aug 2017 08:28:20 +0000
Subject: Bug #71135 [Com]: Random memory corruption with strings
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-210846@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=71135&edit=1

 ID:                 71135
 Comment by:         spam2 at rhsoft dot net
 Reported by:        iquito at gmx dot net
 Summary:            Random memory corruption with strings
 Status:             Closed
 Type:               Bug
 Package:            opcache
 Operating System:   Debian Jessie
 PHP Version:        7.0.0
 Assigned To:        laruence
 Block user comment: N
 Private report:     N

 New Comment:

i face this below with 7.1.8 on the first production machine with 7.1.x randomly when under light
load shared files are updated - maybe related?

Sun Aug 20 19:45:38 2017 (3066): Warning Internal error: wrong size calculation:
global_mysql_ext.inc.php start=0x00007feba814c580, end=0x00007feba816fc60, real=0x00007feba816fc40


Previous Comments:
------------------------------------------------------------------------
[2017-08-28 00:06:51] nick at noodles dot net dot nz

I'm starting to see this problem on PHP 7.1.8. Seems the opcache is randomly being corrupted
one character at a time. This is on a high traffic website with multiple web servers.

------------------------------------------------------------------------
[2017-07-03 10:38:37] kalyanceg at gmail dot com

We are facing this issue on debian stretch with php7.0-opcache 7.0.19-1
We see opcache getting corrupted after some days of apache running continuously and gets fixed only
on restart of apache

------------------------------------------------------------------------
[2016-08-16 10:19:45] teohhanhui at gmail dot com

We're still running into this problem in production on PHP 7.0.8

It happens every few days or so.

Examples of corruption:

Symfony -> Sylfony
Bundle -> Bumdle

(both cases happen to FQCN stored in variables)

------------------------------------------------------------------------
[2016-03-09 15:11:33] iquito at gmx dot net

I have also been running 7.0.4 in production for 48 hours with a lot of opcache_reset's and
opcache_invalidate's, and there do not seem to be any issues anymore - everything seems to be
working great. Therefore I am closing this issue.

------------------------------------------------------------------------
[2016-03-05 12:06:31] vojtech dot kurka at gmail dot com

We have 7.0.4 in production for 48 hours and it is running without any problems with json_encode() -
seems fixed for us.

Thank you, Dmitri!

------------------------------------------------------------------------


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