console_cpu_notify can cause scheduling BUG during CPU hotplug

Kevin Cernekee cernekee at
Mon Apr 25 20:18:37 EDT 2011

On Mon, Apr 25, 2011 at 4:33 PM, Michael Bohan <mbohan at> wrote:
> I was curious if this scenario was accounted for in the design of the
> console CPU notifier. One workaround for this problem is to remove CPU_DEAD
> from the possible actions in console_cpu_notify(). In fact, v1-v4 of the
> patch above did not have CPU_DEAD, CPU_DYING or CPU_DOWN_FAILED in the list
> of actions. I wasn't able to track down why the other cases were added in
> the final patch.

Here is the background information on the CPU_{DEAD,DYING,DOWN_FAILED} cases:

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