SIGBUS with gbm_bo_map() and Intel ARC

[Pierre Ossman]

On 6/20/24 16:29, Pierre Ossman wrote:
> On 6/19/24 11:36, Pierre Ossman wrote:
>>
>> Is there something special I need to pay attention to when doing cross 
>> GPU stuff? I would have assumed that gbm_bo_import() would have 
>> complained if this was an incompatible setup.
>>
> 
> It does indeed look like some step is missing. If I examine 
> /proc/<pid>/maps, I can see that the accessed memory address is 
> associated with the wrong render node:
> 
> Crash reading 0x7fffe4176000
> 7fffe4176000-7fffe4400000 rw-s 100602000 00:06 500 /dev/dri/renderD128
> 

In cross-GPU combinations where it works, I'm seeing this map instead:

7fffef30e000-7fffef408000 rw-s 100056000 00:0b 533 
/dmabuf:

Regards
-- 
Pierre Ossman           Software Development
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A: Because it messes up the order in which people normally read text.
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