[Bug 109695] qemu using spice gl and sandbox resourcecontrol=deny crashes with SIGSYS on radeonsi

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=109695

--- Comment #4 from Daniel P. Berrange <dan-freedesktop@berrange.com> ---
(In reply to Ahzo from comment #0)
> The problematic code at src/util/u_queue.c:252 was added in the following
> commit:
> commit d877451b48a59ab0f9a4210fc736f51da5851c9a
> Author: Marek Olšák <marek.olsak@amd.com>
> Date:   Mon Oct 1 15:51:06 2018 -0400
> 
>     util/u_queue: add UTIL_QUEUE_INIT_SET_FULL_THREAD_AFFINITY
>     
>     Initial version discussed with Rob Clark under a different patch name.
>     This approach leaves his driver unaffected.
> 
> 
> Since setting the thread affinity seems non-essential here, the failing
> syscall should be handled gracefully, for example by setting a signal
> handler to ignore the SIGSYS signal.

I'm curious what motivated this change to start with ?  Even if QEMU was not
enforcing seccomp filters, I think I'd consider it a bug for mesa to be setting
its process affinity in this way.  The mgmt application or sysadmin has decided
that the process must have a certain affinity, based on how it/they want the
host CPUs utilized. Why is mesa wanting to override this administrative policy
decision to restrict CPU usage ?

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