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

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Message-Id: <1586219716.1a3fyi6lh5.none@localhost>
Date:   Mon, 06 Apr 2020 20:38:34 -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 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.