linux-kernel - Re: rcu_sched stall while waiting in csd_lock

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Message-ID: <00171457-416c-94c6-21c7-28817e7367ab@redhat.com>
Date:   Thu, 3 Aug 2017 09:26:06 +0530
From:   Pratyush Anand <panand@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Will Deacon <will.deacon@....com>,
        open list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: rcu_sched stall while waiting in csd_lock_wait()

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