Bug#638316: Same problem here, running squeeze on VMware vSphere 5 ESXi
Sebastian Schäfer wrote:
> The system is running a postgresql9 Server (Version: 9.0.6-1~bpo60+1) with
> two hotstandby Clients, using streaming replication.
Since you are not using Xen, this is most likely not the same bug.
Do the processes remain in the D state, or are they only temporarily
so in some time of particularly high load? If you want to pursue this
(especially if you know of some reliable way to get processes stuck in
the D state), please file a separate bug.
Thanks for writing,