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

From: Chris Friesen
Date: Tue Nov 21 2017 - 10:45:35 EST

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


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
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

CONFIG_MEM_SOFT_DIRTY doesn't exist in our kernel so I don't think this is
the issue. Thanks for the suggestion though.