Description:
------------
On our production servers from time to 
time we got segmentation faults. On 
further investigation we found out 
that the problem was a not or late 
answer of the memcache server or 
another kind of network/request 
latency.

to simulate network latency:
http://www.linuxfoundation.org/
collaborate/workgroups/networking/
netem



Test script:
---------------
<?php
// ...
$keys = array ( 123 );

// set incoming traffic latency to 1200ms, memcache standard timeout is 1s = 1000 ms
exec("tc qdisc add dev ifb0 root netem delay 1200ms");

$result = $memcache->get($keys);

// remove network latency
exec("tc qdisc del dev ifb0 root netem");

?>

Expected result:
----------------
No Segmentation fault

Actual result:
--------------
Segmentation fault