Re: [printk] fbc14616f4: BUG:kernel_reboot-without-warning_in_test_stage

[Peter Zijlstra]

On Sat, Apr 08, 2017 at 12:13:06AM +0900, Sergey Senozhatsky wrote:
> On (04/07/17 14:44), Pavel Machek wrote:
> [..]
> > > [..]
> > > > I believe "spend at most 2 seconds in printk(), then print a warning
> > > > and offload" is a solution closer to what we had before.
> > > 
> > > a warning here can be very noisy.
> > 
> > Well, on normally-configured it should be ok. We don't commonly see
> > printk problems... If it is too noisy, perhaps we should increase from
> > 2 seconds, but I don't think it will be problem.
> 
> we are looking at different typical setups :) serial console being 45
> seconds behind logbuf does not surprise me anymore.

That does sound like you're doing something wrong and should look at
reducing printk() more than anything else.