linux-kernel - Re: rcu_preempt self-detected stall on CPU from 4.4-rc4, since 3.17

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Message-ID: <20151211113051.GH6356@twins.programming.kicks-ass.net>
Date:	Fri, 11 Dec 2015 12:30:51 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ross Green <rgkernel@...il.com>
Cc:	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, rostedt@...dmis.org,
	dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com,
	fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com
Subject: Re: rcu_preempt self-detected stall on CPU from 4.4-rc4, since 3.17

On Fri, Dec 11, 2015 at 10:17:33PM +1100, Ross Green wrote:
> I have been getting these stalls in kernels going back to 3.17.
> 
> This stall occurs usually under light load but often requires several
> days to show itself. I have not found any simple way to trigger the
> stall. Indeed heavy workloads seems not to show the fault.
> 
> Anyone have any thoughts here?

see lkml.kernel.org/r/564F3DCA.1080907@....com
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