Date: Mon, 16 Feb 2015 15:44:12 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Kirill Tkhai <tkhai@yandex.ru>
Cc: Fengguang Wu <fengguang.wu@intel.com>, Ingo Molnar <mingo@kernel.org>,
        LKP <lkp@01.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        juri.lelli@arm.com
Subject: Re: [sched/deadline] kernel BUG at kernel/sched/deadline.c:805!
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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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