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I had a server that was hung so had to power cycle it. Looking in the messages file, these are the last three lines it has prior to the reboot. Anyone know what this means? Dell server with an external array, RHEL.
Jun 3 05:18:38 ServerName kernel: Uhhuh. NMI received for unknown reason 21 on CPU 0.
Jun 3 05:18:38 ServerName kernel: Dazed and confused, but trying to continue
Jun 3 05:18:38 ServerName kernel: Do you have a strange power saving mode enabled?