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

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Message-ID: <1437550528.3106.107.camel@gmail.com>
Date:	Wed, 22 Jul 2015 09:35:28 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Jörn Engel <joern@...estorage.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 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.

	-Mike

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