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

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Date:   Tue, 21 Nov 2017 09:45:27 -0600
From:   Chris Friesen <chris.friesen@...driver.com>
To:     Huaitong Han <oenhan@...il.com>,
        lkml <linux-kernel@...r.kernel.org>
CC:     <linux-mm@...ck.org>
Subject: Re: "swap_free: Bad swap file entry" and "BUG: Bad page map in process"
 but no swap configured

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@...driver.com>:
>> 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