[Nouveau] [Bug 25806] NV40 vertex corruption (kernel BO deletion too early?)

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=25806


Francisco Jerez <currojerez at riseup.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID




--- Comment #2 from Francisco Jerez <currojerez at riseup.net>  2009-12-27 14:25:30 PST ---
(In reply to comment #1)
> Upon further examination, the kernel does seem to have the required logic:
> sending a pushbuffer creates a fence, which is put in bo->sync_obj, which is
> then checked on deletion and if non-null, the buffer is put on a delayed
> destroy list.
> 
> However, it seems to be somehow not working.
> 
> Maybe fencing is broken on my card? (i.e. the kernel thinks fences are signaled
> when they aren't)
> Or possibly fences are being signaled before the vertex shader is finished
> running?

That would be almost unprecedented... it's more likely that some caches in the
GPU aren't being flushed often enough (or maybe the ones in the CPU... a bug in
the kernel PAT code also used to cause the same symptoms, but that's hopefully
already fixed).

I'm marking this as invalid because that's the current policy, unfortunately
we're already aware of too many gallium bugs.

> 
> How can I test that fencing is working correctly?
> 


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