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

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Message-ID: <1437539790.3106.42.camel@gmail.com>
Date:	Wed, 22 Jul 2015 06:36:30 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Spencer Baugh <sbaugh@...ern.com>
Cc:	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>,
	Joern Engel <joern@...estorage.com>,
	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 15:07 -0700, Spencer Baugh wrote:

> We have observed cases where the soft lockup detector triggered, but no
> kernel bug existed.  Instead we had a buggy realtime thread that
> monopolized a cpu.  So let's kill the responsible party and not panic
> the entire system.

If you don't tell the kernel to panic, it won't, and if you don't remove
its leash (the throttle), your not so tame rt beast won't maul you.

	-Mike

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