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

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Date:	Mon, 16 Feb 2015 15:12:44 +0000
From:	Juri Lelli <juri.lelli@....com>
To:	Peter Zijlstra <peterz@...radead.org>,
	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>
Subject: Re: [sched/deadline] kernel BUG at kernel/sched/deadline.c:805!

Hi,

On 16/02/15 14:44, Peter Zijlstra wrote:
> 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.
> 

I also tested this on top of tip, with kvm actually. So, 1019a359d3dc
seemed to reintroduce what aee38ea95419 "sched/deadline: Fix races
between rt_mutex_setprio() and dl_task_timer()" fixed. But, this patch
seems to fix it again :).

Thanks,

- Juri

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