linux-kernel - Re: Bad rss-counter state from drm/ttm, drm/vmwgfx: Support huge TTM pagefaults

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Date:   Tue, 07 Apr 2020 11:36:39 -0400
From:   "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>
To:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org,
        Thomas Hellström "(VMware)" 
        <thomas_os@...pmail.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Christian König <christian.koenig@....com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        linux-graphics-maintainer@...are.com,
        Michal Hocko <mhocko@...e.com>, pv-drivers@...are.com,
        Ralph Campbell <rcampbell@...dia.com>,
        Roland Scheidegger <sroland@...are.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>
Subject: Re: Bad rss-counter state from drm/ttm, drm/vmwgfx: Support huge TTM
 pagefaults

Excerpts from Thomas Hellström (VMware)'s message of April 7, 2020 7:26 am:
> On 4/7/20 2:38 AM, Alex Xu (Hello71) wrote:
>> Excerpts from Thomas Hellström (VMware)'s message of April 6, 2020 5:04 pm:
>>> Hi,
>>>
>>> On 4/6/20 9:51 PM, Alex Xu (Hello71) wrote:
>>>> Using 314b658 with amdgpu, starting sway and firefox causes "BUG: Bad
>>>> rss-counter state" and "BUG: non-zero pgtables_bytes on freeing mm" to
>>>> start filling dmesg, and then closing programs causes more BUGs and
>>>> hangs, and then everything grinds to a halt (can't start more programs,
>>>> can't even reboot through systemd).
>>>>
>>>> Using master and reverting that branch up to that point fixes the
>>>> problem.
>>>>
>>>> I'm using a Ryzen 1600 and AMD Radeon RX 480 on an ASRock B450 Pro4
>>>> board with IOMMU enabled.
>>> If you could try the attached patch, that'd be great!
>>>
>>> Thanks,
>>>
>>> Thomas
>>>
>> Yeah, that works too. Kernel config sent off-list.
>>
>> Regards,
>> Alex.
> 
> Thanks. Do you want me to add your
> 
> Reported-by: and Tested-by: To this patch?
> 
> /Thomas
> 
> 

Sure. Shouldn't we fix it properly though?