linux-kernel - Re: [PATCH v2] printk: Add kernel parameter to disable writes to /dev/kmsg

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Message-ID: <20160425154405.59522c6d@gandalf.local.home>
Date:	Mon, 25 Apr 2016 15:44:05 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH v2] printk: Add kernel parameter to disable writes to
 /dev/kmsg

On Mon, 25 Apr 2016 12:28:30 -0700
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Mon, Apr 25, 2016 at 12:06 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> 
> I think it should be a tristate with "yes/no/ratelimit", and let's
> default to ratelimit.
> 

Also note that ratelimit wouldn't have solved my issue either. It
wasn't that systemd was rapidly spewing into the kernel buffers. It was
doing it gradually, for every connection that I made to the box (lots
of automated connections were also being logged). I believe something
happened on Friday but due to all the unnecessary logging over the
weekend, I lost it.

To make matters worse, I lost my /var/log/syslog data from then.
logrotate was a bit more destructive than I expected.

-- Steve