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;
Subject: Re: Bad rss-counter state from drm/ttm, drm/vmwgfx: Support huge TTM
 pagefaults
To:     "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        =?UTF-8?Q?Christian_K=c3=b6nig?= <christian.koenig@amd.com>,
        Dan Williams <dan.j.williams@intel.com>,
        =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= <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>
From:   =?UTF-8?Q?Thomas_Hellstr=c3=b6m_=28VMware=29?= 
        <thomas_os@shipmail.org>
Organization: VMware Inc.
Message-ID: <37624a1f-8e6b-fe9c-8e0e-a9139e1bbe18@shipmail.org>
Date:   Tue, 7 Apr 2020 13:26:35 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
 Thunderbird/68.2.2
MIME-Version: 1.0
In-Reply-To: <1586219716.1a3fyi6lh5.none@localhost>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
Content-Language: en-US
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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