[Intel-gfx] ✗ Fi.CI.IGT: failure for series starting with [01/31] drm/i915: Defer modeset cleanup to a secondary task

[Chris Wilson]

Quoting Patchwork (2018-06-25 15:44:34)
> == Possible new issues ==
> 
>   Here are the unknown changes that may have been introduced in Patchwork_9411_full:
> 
>   === IGT changes ===
> 
>     ==== Possible regressions ====
> 
>     igt at perf_pmu@enable-race-rcs0:
>       shard-apl:          PASS -> DMESG-FAIL
> 

That was it! A race where enabling pmu would eat the tasklet and end up
stalling submission entirely, caught by hangcheck as a driver bug.

Took long enough to find (even notice, we were masking the bug quite
effectively!),
-Chris