[Bug 104778] intermittent unit test crashes since mesa 17.2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104778

--- Comment #23 from Lionel Landwerlin <lionel.g.landwerlin at linux.intel.com> ---
(In reply to Mark Janes from comment #22)
> Hmm...`cp` in xterm is a pretty clear indicator that this issue is random
> and not triggered by a specific workload.
> 
> Lionel suggested that it would be good to have a feedback from the kernel
> about what didn't pass validation.
> 
> There is a kernel option to generate debug traces for that but you have to
> recompile your kernel with that option.  Lionel, can you provide some
> details?
> 
> It would be a good data point to see if a much older kernel produces this
> error (eg 4.9, 4.4).  I can't deploy those kernels in Mesa i965 CI because
> they lack features needed to run our Vulkan test suites.


With the kernel compiled with CONFIG_DRM_I915_DEBUG_GEM and the following
command issued as root : 

echo 15 > /sys/module/drm/parameters/debug 

You should be able to get some traces about why the execbuffer failed.

Unfortunately that generates a lot of traces...

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