From: Peter Zijlstra <peterz@infradead.org>
To: Pratyush Anand <panand@redhat.com>
Cc: linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
open list <linux-kernel@vger.kernel.org>,
Will Deacon <will.deacon@arm.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: rcu_sched stall while waiting in csd_lock_wait()
Date: Wed, 2 Aug 2017 10:14:37 +0200 [thread overview]
Message-ID: <20170802081437.24skpbdglcymd5em@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <da7c56d6-066a-d123-f0cf-d9a3b97b001e@redhat.com>
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.
next prev parent reply other threads:[~2017-08-02 8:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-02 3:31 Pratyush Anand
2017-08-02 8:08 ` Will Deacon
2017-08-02 8:44 ` Marc Zyngier
2017-08-03 3:56 ` Pratyush Anand
2017-08-03 3:55 ` Pratyush Anand
2017-08-03 7:19 ` Marc Zyngier
2017-08-03 12:54 ` Paul E. McKenney
2017-08-02 8:14 ` Peter Zijlstra [this message]
2017-08-03 3:56 ` Pratyush Anand
2017-08-03 8:32 ` Peter Zijlstra
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