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


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