[Bug 110987] [CI][SHARDS] igt at gem_ctx_engines@independent - fail - Engine instance [2] executed too late

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110987

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
There's a danger here as the test assumes in-order execution without explicit
fencing (or else it is hard to say that each channel is independent), but we
may trigger a timeslice evaluation in the middle and reorder.

The goal of the test is to say that the engine[] are distinct and have no
inherent common timeline (i.e. they all have their own rings and timelines). So
we set them up with a fence that encourages them to execute in the opposite
order to submission.

Easiest way forward then would be to trickle feed the fences.

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