Re: "swap_free: Bad swap file entry" and "BUG: Bad page map in process" but no swap configured

[Chris Friesen]

I think we tracked it down to the "eptad" kernel option on Broadwell processors. 
 Setting "kvm-intel.eptad=0" turned it off.

Chris

On 11/20/2017 03:07 AM, Huaitong Han wrote:
> Hi, Chris
>
> I have met the same issue too, did you have found out the root cause ?
>
> Thanks a lot.
>
> Huaitong Han
>
>
> 2016-10-12 0:02 GMT+08:00 Chris Friesen <chris.friesen@xxxxxxxxxxxxx>:
> > On 10/08/2016 02:05 AM, Hillf Danton wrote:
> > > On Friday, October 07, 2016 5:01 AM Chris Friesen
> > > > I have Linux host running as a kvm hypervisor.  It's running CentOS.  (So
> > > > the
> > > > kernel is based on 3.10 but with loads of stuff backported by RedHat.)  I
> > > > realize this is not a mainline kernel, but I was wondering if anyone is
> > > > aware of
> > > > similar issues that had been fixed in mainline.
> > > Hey, dunno if you're looking for commit
> > >          6dec97dc929 ("mm: move_ptes -- Set soft dirty bit depending on pte
> > > type")
> > > Hillf
> >
> >
> > CONFIG_MEM_SOFT_DIRTY doesn't exist in our kernel so I don't think this is
> > the issue.  Thanks for the suggestion though.
> >
> > Chris