Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port

From: Sebastian Andrzej Siewior
Date: Fri Jan 22 2016 - 09:15:07 EST

On 01/22/2016 02:34 PM, Grygorii Strashko wrote:
>> Do you still see it with the missing lazy bits? I don't see where this
>> could come from.
> yep. I've tried it with and without changing _TIF_WORK_MASK
> Seems It's triggered by Virtual terminal keyboard_tasklet

Just bootet my current v4.4 to cross check what you see and I have this:

[ 3.808273] clocksource: Switched to clocksource arch_sys_counter
[ 3.851193] keyboard: kbd_init(1609)
[ 3.861903] keyboard: kbd_bh(1201)
[ 3.868322] keyboard: kbd_init(1612)
[ 3.868581] NET: Registered protocol family 2

So. No backtrace here. According to the full dmesg I should have all
CPUs up by now. kbd_bh is comming from ksoftirqd as well. No idea why
you see this.
There is a irq off region which sets and removes RUN bit, I have no
idea why you have this backtrace.