Re: [Xen-devel] Re: kernel BUG at mm/swapfile.c:2527!

[Kent Hoxsey <khoxsey@xxxxxxxxxxxxxxxxxxxxxxx>]

Joining this thread lately as a follow-on from a similar problem that is 
happening in Amazon AWS instances. There is a thread on the AWS forums where an 
instance owner has figured out how to cause this bug on demand using apache and 
PHP:

https://forums.aws.amazon.com/thread.jspa?messageID=269851

In case those forums require a login, the php script to hit is:

<?php
$data = array();
for($x = 0; $x< 10000; $x++)
{
        for($y = 0; $y<1000; $y++){
                $data[][]=rand(1,100000);
        }
}
echo count($data);


I am not a PHP programmer, so unsure if that php tag needs to be closed or not, 
but that is what is posted on the forum. Run apache bench against your test URL 
with 200 concurrent connections.

My Amazon instance isn't running PHP but encounters a similar problem once a 
day (1:48pm Pacific). I cannot allow people onto the instance but am willing to 
run diagnostics and post them here.

Kent

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