Xorg indefinitely hangs in kernelspace

[Hillf Danton]

Hi,

On Mon, 9 Sep 2019 from Gerd Hoffmann <kraxel at redhat.com>
>
> Hmm, I think the patch is wrong.  As far I know it is the qxl drivers's
> job to call ttm_eu_backoff_reservation().  Doing that automatically in
> ttm will most likely break other ttm users.
>
Perhaps.

>So I guess the call is missing in the qxl driver somewhere, most likely
>in some error handling code path given that this bug is a relatively
>rare event.
>
>There is only a single ttm_eu_reserve_buffers() call in qxl.
>So how about this?
>
No preference in either way if it is a right cure.

BTW a quick peep at the mainline tree shows not every
ttm_eu_reserve_buffers() pairs with ttm_eu_backoff_reservation()
without qxl being taken in account.

Hillf
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