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

Michel Lespinasse
2011-09-30T21:16:33Z

On Fri, Sep 30, 2011 at 11:19 AM, Eric B Munson <emunson@mgebm.net> 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.

--
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.