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Bug #59218 apc.slam_defence setting ignored
Submitted: 2010-05-17 18:01 UTC Modified: 2016-08-31 15:34 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: alain dot russell at blackpepper dot co dot nz Assigned: cmb (profile)
Status: Wont fix Package: APC (PECL)
PHP Version: 5.2.13 OS: Ubuntu Server 9.04 64bit
Private report: No CVE-ID: None
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From: alain dot russell at blackpepper dot co dot nz
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 [2010-05-17 18:01 UTC] alain dot russell at blackpepper dot co dot nz 
Description:
------------
setting apc.slam_defence=Off is ignored and errors are still 
logged as [apc-warning] Potential cache slam averted for key 
'foo' in xx.php on line 7.

Current settings are:

extension="apc.so"
apc.enable_cli=0
apc.enabled=1
apc.file_update_protection=5
apc.gc_ttl=3600
apc.max_file_size=2M  
apc.num_files_hint=6000
apc.shm_segments=1
apc.shm_size=256
apc.user_ttl=3600
apc.slam_defense=0
apc.write_lock=1

var_dump('slam_defense: ', ini_get('apc.slam_defense'));
string(14) "slam_defense: "
string(0) ""

var_dump('write_lock: ', ini_get('apc.write_lock'));
string(12) "write_lock: "
string(1) "1"

Rolling back to 3.1.2 for now resolved cache slam issue.

Reproduce code:
---------------
apc_store('foo', 1);
echo apc_fetch('foo') . '<br>';

apc_store('foo', 2);
echo apc_fetch('foo') . '<br>';

Expected result:
----------------
1
2

Actual result:
--------------
1
1

Warning Logged: [apc-warning] Potential cache slam averted for 
key 'foo' in xx.php on line x.

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2010-05-28 08:59 UTC] gopalv82 at yahoo dot com 
I can't seem to reproduce this on my machine - at least, not on the 5.3.x build I'm using for QA right now (lucid 10.04).
 [2010-06-15 11:37 UTC] korchasa at gmail dot com 
I have the same problem. Output of the given example:
1
[Tue Jun 15 19:27:58 2010] [apc-warning] Potential cache slam 
averted for key 'foo' in /tmp/apc.php on line 5.
1

Ubuntu 10.4 64bit, PHP 5.3.1 (cli), APC 3.1.3p1
 [2010-06-16 11:20 UTC] parf at comfi dot com 
SAME Problem:

php 5.3.3
apc 3.1.3p1

>>> apc_store("x",1)                     
true                                 
>>> apc_store("x",1)
[Wed Jun 16 11:06:52 2010] [apc-warning] Potential cache slam averted for key 'x' in /hb/bin/phpa(192) : eval()'d code on line 1.                                            
false

apc.slam_defense=0
apc.write_lock=0

does not help

please help
 [2010-06-25 03:03 UTC] se at plista dot com 
Also here with Ubuntu 10.04 (Lucid). See #16814
 [2010-07-16 05:35 UTC] kipelovets at mail dot ru 
i have exactly the same problem on FreeBSD 8.0, can't get rid 
of that message
 [2011-01-05 08:57 UTC] jason at green dot cx 
Same for me too. Ubuntu 10.04 changing it to off in php.ini 
setting is ignored!

Killing my HD I/O!!!
 [2016-08-31 15:34 UTC] cmb@php.net
-Status: Open +Status: Wont fix -Assigned To: +Assigned To: cmb
 [2016-08-31 15:34 UTC] cmb@php.net 
According to <https://bugs.php.net/69618>, APC support has been
discontinued in favor of OPcache, APCu, the session upload
progress API and WinCache. Therefore this issue won't get fixed.
 
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