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

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Date:   Mon, 6 Apr 2020 22:25:49 +0200
From:   Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>
To:     "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>, linux-mm@...ck.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     pv-drivers@...are.com, linux-graphics-maintainer@...are.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Christian König <christian.koenig@....com>,
        Dan Williams <dan.j.williams@...el.com>,
        Roland Scheidegger <sroland@...are.com>
Subject: Re: Bad rss-counter state from drm/ttm, drm/vmwgfx: Support huge TTM
 pagefaults

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