On Wed, Dec 14, 2011 at 08:17:45AM -0600, Nate Custer wrote:
> 
> On Dec 14, 2011, at 8:06 AM, Marcelo Tosatti wrote:
> > I don't know. Its a hang ? It could be memory corruption (of the timer
> > olist) instead of a bogus NMI actually, the second.
> 
> 
> What is pasted in the second paste is what came scrolling across the console 
> right before the end of all responsiveness. It came from a dmesg dump, the 
> next dmesg command was not accepted via ssh and the console attached showed 
> the same stack trace. At that point the system refused to respond to any 
> direct keyboard input, including the SysRq commands that I expected to work 
> after a core dump. 
> 
> The issue happened with two servers (same hardware, same build group so there 
> is a chance of a bad hardware batch). Switching to an older kernel/kvm setup 
> in RHEL 6.2 has corrected the issue, which suggests a software issue to me.

Right. Perhaps try an older upstream kernel to find a culprit then.

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