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

From: Juri Lelli
Date: Mon Feb 16 2015 - 10:12:36 EST


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 :).


- Juri

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