Re: [BUG 3.12.rc4] Oops: unable to handle kernel paging request duringshutdown

[Knut Petersen]

On 15.10.2013 02:59, Paul E. McKenney wrote:
> On Mon, Oct 14, 2013 at 04:16:03PM -0700, Paul E. McKenney wrote:
> > On Mon, Oct 14, 2013 at 11:52:48PM +0200, Knut Petersen wrote:
> > > On 14.10.2013 23:28, Paul E. McKenney wrote:
> > > > On Mon, Oct 14, 2013 at 10:53:03AM -0700, Linus Torvalds wrote:

> > > > IÂll run some tests with those debug parameters tomorrow. 
> > > > Any chance of a look at the .config file?
> > > Attached.
> > Thank you!  Looks like a pretty standard RCU setup.  Just to make sure
> > I saw it correctly -- you are running NR_CPUS=1?  Getting races to happen
> > in that mode is truly impressive!

Yes. The AOpen i915GMm-hfs  is a desktop board with mobile chipset for one Pentium-M.
As a musician I need an absolutely silent system, and the low power consumption of that
technology is a nice add-on.
> Ah, thing...  When running with only one CPU, both of synchronize_rcu_bh()
> and synchronize_sched() become essentially no-ops.  Anything that expected
> them to actually sleep would then break.
>
> However, because you are running with CONFIG_PREEMPT=y, synchronize_rcu()
> will still block.
>
> 							Thanx, Paul

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