[collectd] read-function of plugin `swap' failed ?

[O G]

Hello from a happy Collectd user.
 
I'm seeing the following in collectd.log on some of the machines where collectd is running:
 
[2012-02-27 15:38:07] read-function of plugin `swap' failed. Will suspend it for 20 seconds.
[2012-02-27 15:38:27] read-function of plugin `swap' failed. Will suspend it for 40 seconds.
[2012-02-27 15:39:07] read-function of plugin `swap' failed. Will suspend it for 80 seconds.
[2012-02-27 15:40:27] read-function of plugin `swap' failed. Will suspend it for 160 seconds.
[2012-02-27 15:43:07] read-function of plugin `swap' failed. Will suspend it for 320 seconds.
[2012-02-27 15:48:27] read-function of plugin `swap' failed. Will suspend it for 640 seconds.
 
I Googled before posting and checked Collectd FAQ, but found nothing :(
 
This is collectd 4.10.1 on Ubuntu 11.04.
 
Thanks,
Otis
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