On Sat, 2015-04-11 at 15:36 +0200, Mike Galbraith wrote:
> 
> Well, not reverted, I actually queued and maybe poked softirq, but 
> didn't check whether anything was being queued or not

(the checking: !IRQ_WORK_HARD_IRQ happens, box remains alive)

           mount-827   [002] ....211     9.781994: irq_work_queue: queue work: 
ffff88041ec8d7d0
           mount-827   [002] .N..211     9.781997: irq_work_queue: poke 
ksoftirqd
    sirq-timer/2-49    [002] .....11     9.781999: irq_work_run_list: execute 
work: ffff88041ec8d7d0
          swapon-852   [003] ....211    10.224358: irq_work_queue: queue work: 
ffff88041eccd7d0
    sirq-timer/3-67    [003] .....11    10.224501: irq_work_run_list: execute 
work: ffff88041eccd7d0
       plymouthd-476   [000] ....2..    10.227930: irq_work_queue: queue work: 
ffff88041ec0d7d0
    sirq-timer/0-4     [000] .....11    10.228311: irq_work_run_list: execute 
work: ffff88041ec0d7d0
   systemd-udevd-694   [001] ....211    10.316067: irq_work_queue: queue work: 
ffff88041ec4d7d0
    sirq-timer/1-34    [001] .....11    10.316340: irq_work_run_list: execute 
work: ffff88041ec4d7d0
   systemd-udevd-694   [001] ....211    10.316871: irq_work_queue: queue work: 
ffff88041ec4d7d0
    sirq-timer/1-34    [001] .....11    10.317341: irq_work_run_list: execute 
work: ffff88041ec4d7d0
   systemd-udevd-741   [005] ....211    10.515752: irq_work_queue: queue work: 
ffff88041ed4d7d0
    sirq-timer/5-100   [005] .....11    10.516522: irq_work_run_list: execute 
work: ffff88041ed4d7d0
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