linux-kernel - Re: [PATCH] soft lockup: kill realtime threads before panic

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Message-ID: <20150722163553.GA24041@Sligo.logfs.org>
Date:	Wed, 22 Jul 2015 09:35:53 -0700
From:	Jörn Engel <joern@...estorage.com>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	Spencer Baugh <sbaugh@...ern.com>, Don Zickus <dzickus@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ulrich Obergfell <uobergfe@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Jones <drjones@...hat.com>,
	chai wen <chaiw.fnst@...fujitsu.com>,
	Chris Metcalf <cmetcalf@...hip.com>,
	Stephane Eranian <eranian@...gle.com>,
	open list <linux-kernel@...r.kernel.org>,
	Spencer Baugh <Spencer.baugh@...estorage.com>,
	Joern Engel <joern@...fs.org>
Subject: Re: [PATCH] soft lockup: kill realtime threads before panic

On Wed, Jul 22, 2015 at 09:35:28AM +0200, Mike Galbraith wrote:
> On Tue, 2015-07-21 at 23:33 -0700, Jörn Engel wrote:
> 
> > One could argue that killing the realtime thread is even better than
> > panic, as things can restart with a blank slate even faster.  But the
> > real benefit is that we get better debug data for the failing component.
> > If we had a kernel bug, the backtrace would usually be sufficient to
> > point fingers.  With a bonkers realtime thread, not so much.
> 
> If userspace wants a watchdog, it should train a userspace dog, not turn
> the kernel watchdog into a userspace attack dog.

Fair point.  Let's drop this patch then.

Jörn

--
Money can buy bandwidth, but latency is forever.
-- John R. Mashey
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