On Mon, 2014-04-28 at 16:37 +0200, Mike Galbraith wrote: 

> > Seems that migrate_disable() must be called before taking the lock as
> > it is done in every other location.
> 
> And for tasklist_lock, seems you also MUST do that prior to trylock as
> well, else you'll run afoul of the hotplug beast.

Bah.  Futzing with dmesg while stress script is running is either a very
bad idea, or a very good test.  Both virgin 3.10-rt and 3.12-rt with new
bugs squashed will deadlock.

Too bad I kept on testing, I liked the notion that hotplug was solid ;-)

-Mike

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