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

From: Peter Zijlstra
Date: Mon Feb 16 2015 - 09:44:24 EST

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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