(In reply to Marek Olšák from comment #49)
> (In reply to Marek Olšák from comment #48)
> > Does this fix the hangs?
> > https://cgit.freedesktop.org/mesa/mesa/commit/
> > ?id=d4d9ec55c589156df4edc227a86b4a8c41048d58
> > 
> > It changes the HTILE (HyperZ) allocation function to
> > r600_aligned_buffer_create. Without that, the hardware can hang on big GPUs
> > (Tahiti/Pitcairn/Hawaii/Tonga/etc), but not APUs or small GPUs. The hang
> > happens when TTM decides to move HTILE to a different location with an
> > unaligned physical address (which is pretty random). The hardware tries to
> > access the unaligned address and boom.
> 
> Actually, I think that commit only affects Hawaii and Fiji. Other GPUs might
> be unaffected, which means the Tahiti hangs are due to a different bug.

I've previously tried disabling hyperz on Tahiti with no luck in side stepping
this bug, so I don't think this is the issue.

Could there be other buffers that need similar treatment that are being
ignored?  Is there an easy way to test this locally?