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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [CI][SNB] *ERROR* CPU pipe [A|B] FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102373#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [CI][SNB] *ERROR* CPU pipe [A|B] FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102373">bug 102373</a>
from <span class="vcard"><a class="email" href="mailto:marta.lofstedt@intel.com" title="Marta Löfstedt <marta.lofstedt@intel.com>"> <span class="fn">Marta Löfstedt</span></a>
</span></b>
<pre>A new trend of 100% reproducibility on:
igt@kms_busy@extended-pageflip-hang-oldfb-render-B and
igt@kms_cursor_crc@cursor-128x128-dpms
appear to have started at CI_DRM_3242:
<a href="https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3242/shard-snb5/igt@kms_busy@extended-pageflip-hang-oldfb-render-B.html">https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3242/shard-snb5/igt@kms_busy@extended-pageflip-hang-oldfb-render-B.html</a>
<a href="https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3242/shard-snb4/igt@kms_cursor_crc@cursor-128x128-dpms.html">https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3242/shard-snb4/igt@kms_cursor_crc@cursor-128x128-dpms.html</a>
and is stable at hitting FIFO underrun until at least CI_DRM_3249.
I just noticed that igt@kms_busy@extended-pageflip-hang-oldfb-render-B and
igt@kms_cursor_crc@cursor-128x128-dpms are scheduled in the same shard for all
those runs. The re-randomization of which test goes into which shard is only
done when IGT is rebuilt.
Note, for each CI_DRM_NNNN there is a shards.html, where easily can see which
tests that are in which shards, example:
<a href="https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3246/shards.html">https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3246/shards.html</a>
So, there is potentially some context leak causing this grouping of FIFO
underruns being more probable when tests are run in the same shard.</pre>
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