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

[Eric B Munson]

On Fri, 30 Sep 2011, 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).  It looks to me like
> > a CPU softlocks and it stalls the process active there, so most recently that
> > was XOrg.  The 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.  My 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.
> 

CONFIG_MEMORY_HOTPLUG seems to be the responsible party here, I disabled it in
my config and have been able to build 6 kernels straight without a hang.

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