Re: [PATCH 0/9] V2: idle page tracking / working set estimation

[Eric B Munson]

On Fri, 30 Sep 2011 14:16:25 -0700, Michel Lespinasse wrote:
> On Fri, Sep 30, 2011 at 11:19 AM, Eric B Munson <emunson@xxxxxxxxx> 
> wrote:
> > I am able to recreate on a second desktop I have here (same model 
> > CPU but a
> > different MB so I am fairly sure it isn't dying hardware). ÂIt looks 
> > to me like
> > a CPU softlocks and it stalls the process active there, so most 
> > recently that
> > was XOrg. ÂThe machine lets me login via ssh for a few minutes, but 
> > things like
> > ps and cat or /proc files will start to work and give some output 
> > but hang.
> > I cannot call reboot, nor can I sync the fs and reboot via SysRq. 
> > ÂMy next step
> > is to setup a netconsole to see if anything comes out in the syslog 
> > that I
> > cannot see.
>
> I haven't had time to try & reproduce locally yet (apologies - things
> have been coming up at me).
>
> But a prime suspect would be a bad interaction with
> CONFIG_MEMORY_HOTPLUG, as Kamezama remarked in his reply to patch 4. 
> I
> think this could be the most likely cause of what you're observing.

I will try disabling Memory Hotplug on Monday and let you know if that 
helps.

Eric
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