Re: mx6: suspicious RCU usage

From	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	Re: mx6: suspicious RCU usage
Date	2015-07-14 21:30 +0200
Message-ID	<pMe3U-1e8-21@gated-at.bofh.it> (permalink)
References	(1 earlier) <pMaWl-5cM-15@gated-at.bofh.it> <pMaWm-5cM-37@gated-at.bofh.it> <pMbfI-5zr-11@gated-at.bofh.it> <pMbz4-5Wi-25@gated-at.bofh.it> <pMbIK-67X-9@gated-at.bofh.it>
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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@gmail.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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Thread

mx6: suspicious RCU usage Fabio Estevam <festevam@gmail.com> - 2015-07-14 18:00 +0200
  Re: mx6: suspicious RCU usage "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-14 18:10 +0200
  Re: mx6: suspicious RCU usage "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-14 18:10 +0200
    Re: mx6: suspicious RCU usage Fabio Estevam <festevam@gmail.com> - 2015-07-14 18:10 +0200
      Re: mx6: suspicious RCU usage "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-14 21:30 +0200
      Re: mx6: suspicious RCU usage Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-07-14 22:50 +0200

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