Filed by: abutkovits [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=302722039&repo=mozilla-central
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/P_M5ITItRDaKspmd0oOWkw/runs/0/artifacts/public/logs/live_backing.log
Reftest URL: https://hg.mozilla.org/mozilla-central/raw-file/tip/layout/tools/reftest/reftest-analyzer.xhtml#logurl=https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/P_M5ITItRDaKspmd0oOWkw/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

[task 2020-05-18T11:18:48.868Z] 11:18:48 INFO - REFTEST TEST-START | layout/reftests/border-image/border-image-repeating-radial-gradient.html == layout/reftests/border-image/border-image-repeating-radial-gradient-ref.html
[task 2020-05-18T11:18:48.868Z] 11:18:48 INFO - REFTEST TEST-LOAD | file:///builds/worker/workspace/build/tests/reftest/tests/layout/reftests/border-image/border-image-repeating-radial-gradient.html | 64 / 81 (79%)
[task 2020-05-18T11:18:48.938Z] 11:18:48 INFO - REFTEST TEST-LOAD | file:///builds/worker/workspace/build/tests/reftest/tests/layout/reftests/border-image/border-image-repeating-radial-gradient-ref.html | 64 / 81 (79%)
[task 2020-05-18T11:18:49.009Z] 11:18:49 INFO - REFTEST INFO | REFTEST fuzzy test (0, 0) <= (1, 912) <= (1, 910)
[task 2020-05-18T11:18:49.462Z] 11:18:49 INFO - REFTEST TEST-UNEXPECTED-FAIL | layout/reftests/border-image/border-image-repeating-radial-gradient.html == layout/reftests/border-image/border-image-repeating-radial-gradient-ref.html | image comparison, max difference: 1, number of differing pixels: 912

Started to fail with this merge:
https://treeherder.mozilla.org/#/jobs?repo=mozilla-central&searchStr=Linux%2C18.04%2Cx64%2CCCov%2Copt%2CReftests%2Ctest-linux1804-64-ccov%2Fopt-reftest-e10s-5%2CR%28R5%29&tochange=8acda9da4ae71f0b6561cb2021bcb370e18ce80c&fromchange=80ba3f3cfaf9b31341bca28e2e6aea383cec8acc&selectedTaskRun=Pfw8r38uRtiI_m_EbwgkkQ-0

Continued retriggers on autoland up to:
https://treeherder.mozilla.org/#/jobs?repo=autoland&searchStr=Linux%2C18.04%2Cx64%2CCCov%2Copt%2CReftests%2Ctest-linux1804-64-ccov%2Fopt-reftest-e10s-5%2CR%28R5%29&tochange=5f7897d4523021ee64a2d75eb9ace78bdd8d6133&fromchange=a634a062fb973d758283e9b1229ce26765265c7d&selectedTaskRun=Yox-GpQnTd2LPg92YjU7hg-0

Hiroyuki, can you please take a look? Thank you

https://hg.mozilla.org/mozilla-central/rev/ad27c059473a

Thank you Robert!