[Intel-gfx] ✗ Fi.CI.BAT: failure for series starting with [v2,1/3] drm/i915/guc: init GuC descriptors after GuC load

[Chris Wilson]

Quoting Daniele Ceraolo Spurio (2018-10-03 01:12:57)
> 
> 
> On 02/10/18 15:39, Patchwork wrote:
> > == Series Details ==
> > 
> > Series: series starting with [v2,1/3] drm/i915/guc: init GuC descriptors after GuC load
> > URL   : https://patchwork.freedesktop.org/series/50464/
> > State : failure
> > 
> > == Summary ==
> > 
> > = CI Bug Log - changes from CI_DRM_4915 -> Patchwork_10331 =
> > 
> > == Summary - FAILURE ==
> > 
> >    Serious unknown changes coming with Patchwork_10331 absolutely need to be
> >    verified manually.
> >    
> >    If you think the reported changes have nothing to do with the changes
> >    introduced in Patchwork_10331, please notify your bug team to allow them
> >    to document this new failure mode, which will reduce false positives in CI.
> > 
> >    External URL: https://patchwork.freedesktop.org/api/1.0/series/50464/revisions/1/mbox/
> > 
> > == Possible new issues ==
> > 
> >    Here are the unknown changes that may have been introduced in Patchwork_10331:
> > 
> >    === IGT changes ===
> > 
> >      ==== Possible regressions ====
> > 
> >      igt at drv_selftest@live_gem:
> >        fi-whl-u:           PASS -> INCOMPLETE
> >        fi-skl-6600u:       PASS -> INCOMPLETE
> >        fi-kbl-7560u:       PASS -> INCOMPLETE
> >        fi-cfl-s3:          PASS -> INCOMPLETE
> >        fi-skl-iommu:       PASS -> INCOMPLETE
> >        fi-skl-6700k2:      PASS -> INCOMPLETE
> >        fi-skl-6700hq:      PASS -> INCOMPLETE
> >        fi-cfl-8109u:       PASS -> INCOMPLETE
> >        fi-kbl-7500u:       PASS -> INCOMPLETE
> >        fi-cfl-8700k:       PASS -> INCOMPLETE
> >        fi-skl-6770hq:      PASS -> INCOMPLETE
> >        fi-kbl-7567u:       PASS -> INCOMPLETE
> >        fi-kbl-x1275:       PASS -> INCOMPLETE
> >        fi-kbl-8809g:       PASS -> INCOMPLETE
> >        fi-kbl-r:           PASS -> INCOMPLETE
> > 
> 
> Those failures are there even without my patches (see 
> https://patchwork.freedesktop.org/series/40112/). Is there an existing 
> bugzilla? In the meantime, I'll have a look to see if I can find what's 
> causing this.

inject_preempt_context() fails when talking to the guc, catastrophe
ensues. As shown above it's quite reliable after a fake suspend/resume,
but it also happens during normal preemption (the preemption smoketest
was added to exercise this issue).
-Chris