[CentOS] INFO: task nash:5282 blocked for more than 120 seconds.

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I did some configuration changes on a XenServer 5.6 (Which I believe is running CentOS 5.5 under the hood). After a reboot, the server failed to come back up. Connecting to the serial console, I see that it hangs right after setting hostname:

Setting hostname somehostname: [ OK ] INFO: task nash:5282 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. INFO: task nash:5282 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

the last two lines keep repeating.

How can I get this server to boot up? Do I need to use a cd and go into rescue mode?

Any help would be greatly appreciated,

Russ