Filed by: cbook [at] mozilla.com https://treeherder.mozilla.org/logviewer.html#?job_id=4438201&repo=mozilla-aurora https://archive.mozilla.org/pub/firefox/tinderbox-builds/mozilla-aurora-win64-pgo/1481770561/mozilla-aurora_win8_64_test_pgo-reftest-e10s-bm109-tests1-windows-build21.txt.gz https://hg.mozilla.org/mozilla-central/raw-file/tip/layout/tools/reftest/reftest-analyzer.xhtml#logurl=https://archive.mozilla.org/pub/firefox/tinderbox-builds/mozilla-aurora-win64-pgo/1481770561/mozilla-aurora_win8_64_test_pgo-reftest-e10s-bm109-tests1-windows-build21.txt.gz&only_show_unexpected=1
This looks like a bad graphics card, or something like that. Facts about the mismatch here: - It's way off to the bottom right of the reftest snapshot (far away from the actual test content) - It's a block of 16px (2 rows of 8) - Each mismatching pixel is pink in the testcase and white in the reference case. Specifically, it's rgb(255,0,255) vs rgb(255,255,255). So I suspect this was a one-off issue and doesn't have anything to do with this particular test. Might be bad hardware, or a random driver bug, or something like that.