storing array bizarre key error

[kowach]

When storing array some keys are scrambled to some random value same length as previous key.

$apc_data = array(
    'test'=>'123', 
    'data'=>'test123456');
$apc_key = 'abc';
apc_store($apc_key, $apc_data);

• in same request apc_fetch returns ok keys
• on next request(s) apc_fetch returns something like this

Array
(
    [@��b] => 123
    [`��b] => test123456
)

PHP 5.5.1
APCu 4.0.2
Apache 2.2.15
CentOS release 6.4 x86_64

[krakjoe]

Not able to reproduce with the code you provided, does this exact code shows errors for you ??

Looks as if the memory that was allocated for keys was free'd, don't see where this might happen ...

[kowach]

There is no error in log. I'm runnig it under my test (virtual) machine. Maybe there is conflict with some other extension. I have lots of stuff there...

I have installed fresh centos and it seams everything ok.

[arjenschol]

I've see this too under PHP 5.4.x and ArchLinux. Unfortunately, I was not able to create a stand-alone testcase although it was repeatable.

[krakjoe]

I'm not able to reproduce under apache, someone said they could reproduce with fpm, so I'll try that when I've some time to setup ...

[kowach]

I tried to debug line by line, sometimes it retrieves array keys ok, sometimes not. I could not find the pattern, only that it happens on more complex php scripts and/or after certain time of doing nothing. I have case where one script repairs the state of key and other script scrambles it.

[dhardtke]

I got the same problem, but can't reproduce it..

[gxs85]

Corruption seemed to disappear after changing apc.serializer ini setting to "php".

[krakjoe]

can someone else confirm ...

[kowach]

Confirmed. Bug is in default apc serializer.