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Subject: Re: Bad rss-counter state from drm/ttm, drm/vmwgfx: Support huge TTM
 pagefaults
To:     "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>, linux-mm@kvack.org,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Cc:     pv-drivers@vmware.com, linux-graphics-maintainer@vmware.com,
        Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@suse.com>,
        "Matthew Wilcox (Oracle)" <willy@infradead.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Ralph Campbell <rcampbell@nvidia.com>,
        =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= <jglisse@redhat.com>,
        =?UTF-8?Q?Christian_K=c3=b6nig?= <christian.koenig@amd.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Roland Scheidegger <sroland@vmware.com>
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From:   =?UTF-8?Q?Thomas_Hellstr=c3=b6m_=28VMware=29?= 
        <thomas_os@shipmail.org>
Organization: VMware Inc.
Message-ID: <249c73d2-991a-56b0-53b5-677e9ca54aae@shipmail.org>
Date:   Mon, 6 Apr 2020 22:25:49 +0200
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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.

Hmm. That sounds bad. Could you send a copy of your config?

Meanwhile, I'll prepare a small patch that disables the non-vmwgfx 
huge_fault() until we've figured out what's happening.

/Thomas