linux-kernel - rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

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Date:	Tue, 9 Feb 2016 21:11:55 +1100
From:	Ross Green <rgkernel@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Paul McKenney <paulmck@...ux.vnet.ibm.com>, mingo@...nel.org,
	jiangshanlai@...il.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com,
	Eric Dumazet <edumazet@...gle.com>, dvhart@...ux.intel.com,
	Frédéric Weisbecker <fweisbec@...il.com>,
	oleg@...hat.com, pranith kumar <bobby.prani@...il.com>
Subject: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

Continued testing with the latest linux-4.5-rc3 release.

Please find attached a copy of traces from dmesg:

There is a lot more debug and trace data so hopefully this will shed
some light on what might be happening here.

My testing remains run a series of simple benchmarks, let that run to
completion and then leave the system idle away with just a few daemons
running.

the self detected stalls in this instance turned up after a days run time.
There were  NO heavy artificial computational loads on the machine.

Regards,

Ross Green

Download attachment "dmesg-4.5-rc3" of type "application/octet-stream" (29097 bytes)