Theory is that the individual jason file for the subtest wasn't written due to disc/mem malfunction. Piglit the reprots incomplete on the tests however testing goes on reporting pass to Jenkins over network...

Here is another example:

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4248/shard-glkb1/igt@gem_workarounds@hibernate-resume-fd.html

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4258/shard-glkb1/igt@drm_vma_limiter_cached.html

run.log has finished

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3779/shard-glkb1/igt@kms_ccs@pipe-b-bad-aux-stride.html

idea is to change the disk on glkb1

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4262/shard-glkb1/igt@pm_backlight@fade.html

Above is before disk change

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3785/shard-glkb1/igt@kms_atomic_interruptible@legacy-pageflip.html
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3786/shard-glkb1/igt@kms_vblank@pipe-c-query-forked-busy-hang.html
these are also potentially before disc update.

There appear to be no new occurrences after disk was changed on GLK1. I let it simmer until Friday.

This issue hasn't been reproduced since the disk was changed on the GLKB1 machine. I will close this.