[Mesa-dev] Crash inside iris_dri.so when using the OpenGL backend in Cairo on Ubuntu 20.04

[Lionel Landwerlin]

Hi Filip,

Did you file an issue about this?

If not, could you open one with the details of the platform you're 
experiencing the crash on and the steps to reproduce?

Thanks,

-Lionel

On 04/09/2020 11:37, Filip Strömbäck wrote:
> Dear mesa-dev,
>
> I recently updated my system, and it seems like Mesa is now using the 
> new iris driver for my Intel GPU (a Lenovo Thinkpad), which makes a 
> program I'm developing crash somewhere inside iris_dri.so (it is 
> drawing using the GLX backend in Cairo). Forcing the old i965 driver 
> with the environment variable solves the problem, which makes me 
> suspect a bug (or at least more strict behavior) in the new iris 
> driver compared to the old one.
>
> Is this a known issue, or should I report it as a bug? It might as 
> well be the case that Cairo is misbehaving subtly, but that the 
> behavior was tolerated by the old i965 driver.
>
> My short-term solution (which is perhaps better anyway) is to migrate 
> away from the experimental GL backend in Cairo, but as this could 
> indicate a bug in the iris driver I thought it might be interesting 
> for you to be aware of.
>
> The program is available in compiled form here: 
> https://www.ida.liu.se/~TDDI16/2020/tutorials/trees.tar (I might 
> update it during the coming days to work around the bug). I can 
> provide both source and compiled binaries that reproduce the problem 
> more consistently if you wish to investigate further. The linked 
> program requires some interaction to crash, but crashes fairly 
> consistently.
>
> With kind regards,
> Filip Strömbäck
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