Messages in this thread | | | Date | Thu, 3 Sep 2015 00:24:27 +0200 | From | Peter Zijlstra <> | Subject | Re: Warning in irq_work_queue_on() |
| |
On Wed, Sep 02, 2015 at 11:50:22PM +0200, Frederic Weisbecker wrote: > > > [ 875.703227] [<ffffffff810c2d74>] tick_nohz_full_kick_cpu+0x44/0x50 > > It happens in nohz full, but I'm not sure the guilty is nohz full. > > The problem here is that wake_up_nohz_cpu() selects a CPU that is offline.
wake_up_nohz_cpu() doesn't do any such thing. Where does the selection logic live?
> But this shouldn't happen. Either it selects a CPU that is in the domain tree, > and I suspect offline CPUs aren't supposed to be there, or it selects the current > CPU. And if the CPU is offlined, it shouldn't be running some kthread...
Do no assume things like that.. always check with the active mask.
| |