linux-kernel - Re: mx6: suspicious RCU usage

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Date:	Tue, 14 Jul 2015 12:26:24 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Fabio Estevam <festevam@...il.com>
Cc:	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Peter Zijlstra <peterz@...radead.org>, rostedt@...dmis.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: mx6: suspicious RCU usage

On Tue, Jul 14, 2015 at 01:59:10PM -0300, Fabio Estevam wrote:
> On Tue, Jul 14, 2015 at 1:44 PM, Fabio Estevam <festevam@...il.com> wrote:
> 
> > With your patch applied I am running several suspend/resume cycles and
> > I am seeing different problems now from time to time (like 1 out 10
> > times). The kernel dump does not look like the same every time, but
> > here is one example:
> 
> Here is another one I just got, and it seems to be more informative:
> 
> http://pastebin.com/T4YxuLCg

This might simply be a symptom of the earlier "Unable to handle
kernel paging request at virtual address 708ebbfa".  However, the
usual cause of the later "rcu_read_lock() used illegally while idle!"
is just that.  In this case, might the interrupt have occurred
without irq_enter() being invoked?

(But there are probably two interleaved stack traces, and I am not
certain that I am getting them untangled properly.)

							Thanx, Paul

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