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

From: Date: Tue, 02 Feb 2016 21:52:12 +0000
Subject: Bug #71135 [Asn]: Random memory corruption with strings
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-199010@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
 User updated by:    iquito at gmx dot net
 Reported by:        iquito at gmx dot net
 Summary:            Random memory corruption with strings
 Status:             Assigned
 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:

fast_shutdown was always set to 0 in my configuration.


Previous Comments:
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[2016-02-02 19:34:06] sroussey at gmail dot com

Try with fast_shutdown set to 0. This cleared up issues we had with string memory corruption.

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[2016-01-18 08:49:22] w1zzard at techpowerup dot com

I can confirm this issue.

Seeing it on PHP 7.0.2 from remi. Just like OP it happens roughly once a day. 

Running inside Docker container.

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[2015-12-27 23:12:18] iquito at gmx dot net

I cannot edit the bug report / change the status, the error message

"You aren't allowed to change a bug to that state."

always appears, although I provide the correct password, and therefore I cannot submit anything with
the "Edit" method or provide "official" feedback. I therefore provided feedback
via Add Comment, which does not seem to count.

------------------------------------------------------------------------
[2015-12-27 04:22:29] php-bugs at lists dot php dot net

No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.

------------------------------------------------------------------------
[2015-12-16 17:05:20] iquito at gmx dot net

Unfortunately, I do not know how to make further tests in a "safe" way - this problem only
occured in production with many requests per second, and only after at least 12 hours of PHP-FPM
running. If any string can have a "flipped" character in it at some point, I cannot use
PHP7 for now - really bad stuff could happen in my applications.

I switched back to PHP 5.6 for now - no problem like this occurs with 5.6. PHP 7 is still running on
the server with the smarty "bug" in it, but I do not know if that helps or if any
information about what caused this bug can be captured from a running PHP-FPM instance which
exhibits this bug.

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the rest of the comments, please view the bug report online at

    https://bugs.php.net/bug.php?id=71135


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Edit this bug report at https://bugs.php.net/bug.php?id=71135&edit=1

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