Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Tue, 07 Apr 2020 11:36:39 -0400
From:   "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>
Subject: Re: Bad rss-counter state from drm/ttm, drm/vmwgfx: Support huge TTM
 pagefaults
To:     dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org,
        Thomas =?iso-8859-1?q?Hellstr=F6m?= "(VMware)" 
        <thomas_os@shipmail.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Christian =?iso-8859-1?b?S/ZuaWc=?= <christian.koenig@amd.com>,
        Dan Williams <dan.j.williams@intel.com>,
        =?iso-8859-1?b?Suly9G1l?= Glisse <jglisse@redhat.com>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        linux-graphics-maintainer@vmware.com,
        Michal Hocko <mhocko@suse.com>, pv-drivers@vmware.com,
        Ralph Campbell <rcampbell@nvidia.com>,
        Roland Scheidegger <sroland@vmware.com>,
        "Matthew Wilcox (Oracle)" <willy@infradead.org>
References: <1586138158.v5u7myprlp.none.ref@localhost>
        <1586138158.v5u7myprlp.none@localhost>
        <0b12b28c-5f42-b56b-ea79-6e3d1052b332@shipmail.org>
        <1586219716.1a3fyi6lh5.none@localhost>
        <37624a1f-8e6b-fe9c-8e0e-a9139e1bbe18@shipmail.org>
In-Reply-To: <37624a1f-8e6b-fe9c-8e0e-a9139e1bbe18@shipmail.org>
MIME-Version: 1.0
Message-Id: <1586273767.0q72rozj3x.none@localhost>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Content-Length: 1150
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Excerpts from Thomas Hellstr=C3=B6m (VMware)'s message of April 7, 2020 7:2=
6 am:
> On 4/7/20 2:38 AM, Alex Xu (Hello71) wrote:
>> Excerpts from Thomas Hellstr=C3=B6m (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.
>=20
> Thanks. Do you want me to add your
>=20
> Reported-by: and Tested-by: To this patch?
>=20
> /Thomas
>=20
>=20

Sure. Shouldn't we fix it properly though?