Re: rcu_sched stall while waiting in csd_lock_wait()

[Pratyush Anand]

Hi Peter,

On Wednesday 02 August 2017 01:44 PM, Peter Zijlstra wrote:
> On Wed, Aug 02, 2017 at 09:01:19AM +0530, Pratyush Anand wrote:
> > Hi,
> >
> > I am observing following rcu_sched stall while executing `perf record -a  --
> > sleep 1` with one of the arm64 platform. It looks like that stalled cpu was
> > waiting in csd_lock_wait() from where it never came out,and so the stall.
> > Any help/pointer for further debugging would be very helpful. Problem also
> > reproduced with 4.13.0-rc3.
>
> I'm sitting on this patch:
>
>    https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?h=locking/core&id=15377ef4fe0c86eb7fa1099575b2e86357d99e42
>
> please give that a spin.

Thanks for the pointer.
Tried, but it did not help.

--
Regards
Pratyush