Re: NMI watchdog dump does not print on hard lockup

[Steven Rostedt]

On Fri, 13 Oct 2017 13:14:44 +0200
Petr Mladek <pmladek@xxxxxxxx> wrote:

> In general, we could either improve detection of situations when
> the entire system is locked. It would be a reason to risk calling
> consoles even in NMI.
> 
> Or we could accept that the "default" printk is not good for all
> situations and allow more special "debugging" modes:
> 
> 	   + Peter's force_early_printk stuff
> 
> 	   + Allow to disable printk_safe and printk_safe_nmi.
> 	     There will be a risk of a deadlock caused by printk.
> 	     But there also will be a chance to see the messages.

Or add the following case: The watchdog triggers, does the print, then
if it triggers again in a certain amount of time, and the print still
hasn't been flushed, the flush happens then.

-- Steve