linux-kernel - Re: [printk] fbc14616f4: BUG:kernel_reboot-without-warning_in_test

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Date:   Sat, 8 Apr 2017 00:40:47 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Pavel Machek <pavel@....cz>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Jan Kara <jack@...e.cz>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Ye Xiaolong <xiaolong.ye@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Len Brown <len.brown@...el.com>,
        linux-kernel@...r.kernel.org, lkp@...org
Subject: Re: [printk]  fbc14616f4:
 BUG:kernel_reboot-without-warning_in_test_stage

On (04/07/17 17:23), Peter Zijlstra wrote:
[..]
> > 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.

yeah, 45sec is an extreme case that simply doesn't surprise me anymore ;)
that's not a normal/usual delay, of course, we are not this mad. on average
it's much better and may be not so far 2 seconds after all. a massive OOM
report, of course, appends logbuf messages at a much higher rate than UART
serial console can swallow, so the delay is getting larger, expectedly.
and, no, I don't add any printk-s, I'm looking at the lockup reports

	-ss