Hello Mark,

We ran into a similar situation. For details, check
http://www.joost.cx/apc-unknown-hashtable-destructor/

In short: As soon as you create a static class property, and
initialize it to '=array()', the next time you assign something to
that property, you'll get a similar error as you have described above.
The simple solution is to pre-initialize that static property to
'null'.
We use APC in combination with XDEBUG too, but disabling XDEBUG did
not solve our problem.
You'll also find a link to a bugreport on APC on my site, and if I
find any further info/solution, I'll post it there.
Best regards,
Joost Faassen // www.joost.cx

On Jun 23, 3:49 pm, markh <hamlinma...@googlemail.com> wrote:
> ALERT - possible memory corruption detected - unknownHashtable
> destructor (attacker 'REMOTE_ADDR not set', file '/mnt/hgfs/src/snm-
> symfony/trunk/lib/vendor/symfony/lib/log/sfVarLogger.class.php', line
> 169)
>
> I got this error running a symfony task.  Other tasks might terminate
> with same or a segfault.
>
> strace revealed this: send(4, "<9>suhosin[9752]: ALERT - possibl"...,
> 225, 0) = 225
>
> There are many reports of this and similar errors, with fixes
> involving suhosin.  But my problem was caused by something else
> entirely, XDebug.
>
> I fixed this by removing the following xdebug settings of death from
> the php.ini.
>
> xdebug.collect_return=1
> xdebug.collect_assignments=1
> xdebug.collect_params=1
>
> I'm guessing I could have left xdebug.collect_return, as I know from
> previous experience its assignments and params that usually cause
> problems.  But I'll leave that test for another day.
>
> Mark

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