Re: [Bug #11989] Suspend failure on NForce4-based boards due to chanes in stop_machine

Heiko Carstens
2008-11-12T09:05:08Z

On Tue, Nov 11, 2008 at 09:34:51AM -0800, Paul E. McKenney wrote:
> On Tue, Nov 11, 2008 at 08:45:23AM -0800, Paul E. McKenney wrote:
> > On Tue, Nov 11, 2008 at 05:14:01PM +0100, Heiko Carstens wrote:
> > > > > Could you please apply the following debug patch (due to Jiangshan and
> > > > > myself)? Then you should be able to build with CONFIG_RCU_TRACE,
> > > > > then mount debugfs after boot, for example, on /debug. This will
> > > > > create a /debug/rcu directory with three files, "rcucb", "rcu_data",
> > > > > and "rcu_bh_data". Since you are still able to log in, could you
> > > > > please send the contents of these three files?
> > > > >
> > > > > Thanx, Paul
> > > >
> > > > This time with the patch actually attached... Thanks to Peter Z.
> > > > for alerting me to my omission.
> > >
> > > Well, your patch doesn't apply on git head. However I used preemptible
> > > RCU instead and had tracing enabled.
> >
> > Were you using preemptible RCU earlier as well? Raphael was using
> > classic RCU. Don't get me wrong, all problems need fixing, just trying
> > to make sure I understand where the problems are occurring.

Indeed, my fault. I just try to reproduce a cpu hotplug bug with classic RCU
and cpu hotplug stress test, but no luck so far.