linux-kernel - Re: [sched/deadline] kernel BUG at kernel/sched/deadline.c:805!

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Message-ID: <20150216144412.GS24151@twins.programming.kicks-ass.net>
Date:	Mon, 16 Feb 2015 15:44:12 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kirill Tkhai <tkhai@...dex.ru>
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	Ingo Molnar <mingo@...nel.org>, LKP <lkp@...org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	juri.lelli@....com
Subject: Re: [sched/deadline] kernel BUG at kernel/sched/deadline.c:805!

On Mon, Feb 16, 2015 at 02:08:21PM +0100, Peter Zijlstra wrote:
> On Mon, Feb 16, 2015 at 03:38:34PM +0300, Kirill Tkhai wrote:
> > We shouldn't enqueue migrating tasks. Please, try this one instead ;)
> 
> Ha, we should amend that task-rq-lock loop for that. See below.
> 
> I've not yet tested; going to try and reconstruct a .config that
> triggers the oops.

OK, I had to remove -enable-kvm from Wu's script, otherwise the test
would not hit the CBS limit, and then I had to remove the panic on
softlockup because well, qemu is so slow you're going to hit that :-)

But the good news is that I could reproduce and this patch does indeed
seem to solve it.
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