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Bug #72590 Opcache restart with kill_all_lockers does not work as expected
Submitted: 2016-07-13 02:38 UTC Modified: 2016-07-13 03:13 UTC
From: keyur@php.net Assigned: keyur (profile)
Status: Closed Package: opcache
PHP Version: 7.0.8 OS: Linux
Private report: No CVE-ID: None
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 [2016-07-13 02:38 UTC] keyur@php.net 
Description:
------------
Suppose one of the Apache child is blocked by a malloc deadlock while holding a read lock on Opcache. After some time Opcache gets full and is scheduled to be restarted. 

Because of the child holding the lock, we eventually end up calling kill_all_lockers.

This line https://github.com/php/php-src/blob/PHP-7.0.0/ext/opcache/ZendAccelerator.c#L600 calls zend_accel_error with ACCEL_LOG_ERROR.

ACCEL_LOG_ERROR is special and causes a zend_bailout, so the code never gets to call kill() in line 601. Combined with the reset of force_restart_time in line 597, the child is never terminated and Opcache never restarts.

The fix would be to change the log level to ACCEL_LOG_WARNING

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 [2016-07-13 02:38 UTC] keyur@php.net
-Assigned To: +Assigned To: keyur
 [2016-07-13 03:13 UTC] keyur@php.net
-Status: Assigned +Status: Closed
 [2016-07-13 03:13 UTC] keyur@php.net 
The fix for this bug has been committed.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.

 For Windows:

http://windows.php.net/snapshots/
 
Thank you for the report, and for helping us make PHP better.
 [2016-09-05 15:06 UTC] jpauli@php.net 
Backported to PHP-5.6 today
 
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