Re: [syzbot? printk?] no WARN_ON() messages printed before "Kernel panic - not syncing: panic_on_warn set ..."

[Tetsuo Handa]

On 2019/03/16 23:16, Dmitry Vyukov wrote:
>>> Maybe try running with "ignore_loglevel" kernel command line option added?
>>
>> Right, that's something I would expect 0-day and syzkaller to do.
> 
> to double-check: enabling this won't lead to verbose/debug level of logging?
> 

I don't know what "verbose/debug level" means. But enabling this option causes
KERN_{EMERG,ALERT,CRIT,ERR,WARNING,NOTICE,INFO,DEBUG} be printed equally.

  "ignore loglevel setting (prints all kernel messages to the console)"

static bool suppress_message_printing(int level)
{
	return (level >= console_loglevel && !ignore_loglevel);
}