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Date:   Mon, 06 Apr 2020 20:38:34 -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>
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Excerpts from Thomas Hellstr=C3=B6m (VMware)'s message of April 6, 2020 5:0=
4 pm:
> Hi,
>=20
> 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.
>=20
> If you could try the attached patch, that'd be great!
>=20
> Thanks,
>=20
> Thomas
>=20

Yeah, that works too. Kernel config sent off-list.

Regards,
Alex.