[Bug 100007] [SNB][BAT] igt at gem_exec_flush@basic-batch-kernel-default-uc Failed assertion: intel_detect_and_clear_missed_interrupts(fd) == 0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100007

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
In essence, it is a timing issue between raising the interrupt and processing
the breadcrumb. Note sure just why

commit 67b807a892302d184f6987b0c3cc2dc2505e4a2d
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Feb 27 20:58:50 2017 +0000

    drm/i915: Delay disabling the user interrupt for breadcrumbs

...

commit 8d769ea7bc16c34c9dc5143be021e943014c4cd1
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Feb 27 20:58:47 2017 +0000

    drm/i915: Report both waiters and success from intel_engine_wakeup()

would have had a significant (bad) impact on the irq-seqno timings, or why it
is only showing up in a single test - though we haven't had that many runs yet.

Usual test is the full gem_sync to see how regular the error is.

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