Bug: Intermittent [tier 2] unknown test url | undefined assertion name - got "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABPQAAAAKCAYAAAAzbgAVAAABFklEQVR4Xu3YUQkAMAxDwdW/tXraYC4eXBWES78ye/YeR4AAAQIECBAgQIAAAQIECBAgQIBAQmAMeo
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2022-02-09 23:37:04+00:00
Resolved: 2023-07-07 12:01:00+00:00

**Filed by:** ctuns [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=367305179&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/DtxV8-FnQi2MX2mjcH_7Og/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2022-02-09T22:53:34.736Z] 22:53:34     INFO - TEST-PASS | unknown test url | undefined assertion name 
[task 2022-02-09T22:53:34.736Z] 22:53:34     INFO - Buffered messages finished
[task 2022-02-09T22:53:34.739Z] 22:53:34     INFO - TEST-UNEXPECTED-FAIL | unknown test url | undefined assertion name - got "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABPQAAAAKCAYAAAAzbgAVAAABFklEQVR4Xu3YUQkAMAxDwdW/tXraYC4eXBWES78ye/YeR4AAAQIECBAgQIAAAQIECBAgQIBAQmAMeomehCRAgAABAgQIECBAgAABAgQIECDwBQx6HoEAAQIECBAgQIAAAQIECBAgQIBASMCgFypLVAIECBAgQIAAAQIECBAgQIAAAQIGPT9AgAABAgQIECBAgAABAgQIECBAICRg0AuVJSoBAgQIECBAgAABAgQIECBAgAABg54fIECAAAECBAgQIECAAAECBAgQIBASMOiFyhKVAAECBAgQIECAAAECBAgQIECAgEHPDxAgQIAAAQIECBAgQIAAAQIECBAICRj0QmWJSoAAAQIECBAgQIAAAQIECBAgQOABE04Z8XsfchUAAAAASUVORK5CYII=", expected "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABPQAAAAKCAYAAAAzbgAVAAABFklEQVR4Xu3YQQ0AMAwDsZY/tXHaRuMkF0Hk9JW9/8YRIECAAAECBAgQIECAAAECBAgQIJAQ2DPHoJeoSkgCBAgQIECAAAECBAgQIECAAAECMwY9X0CAAAECBAgQIECAAAECBAgQIEAgJGDQC5UlKgECBAgQIECAAAECBAgQIECAAAGDnh8gQIAAAQIECBAgQIAAAQIECBAgEBIw6IXKEpUAAQIECBAgQIAAAQIECBAgQICAQc8PECBAgAABAgQIECBAgAABAgQIEAgJGPRCZYlKgAABAgQIECBAgAABAgQIECBAwKDnBwgQIECAAAECBAgQIECAAAECBAiEBAx6obJEJUCAAAECBAgQIECAAAECBAgQIPAAeUIbVojzJfUAAAAASUVORK5CYII="
[task 2022-02-09T22:53:34.739Z] 22:53:34     INFO -     SimpleTest.is@SimpleTest/SimpleTest.js:500:14
[task 2022-02-09T22:53:34.740Z] 22:53:34     INFO -     test/<@gfx/layers/apz/test/mochitest/helper_scroll_linked_effect_by_wheel.html:58:7
[task 2022-02-09T22:53:34.740Z] 22:53:34     INFO -     test@gfx/layers/apz/test/mochitest/helper_scroll_linked_effect_by_wheel.html:57:13
[task 2022-02-09T22:53:34.743Z] 22:53:34     INFO - GECKO(15622) | MEMORY STAT | vsize 2482MB | residentFast 103MB | heapAllocated 5MB
[task 2022-02-09T22:53:34.744Z] 22:53:34     INFO - TEST-OK | gfx/layers/apz/test/mochitest/test_group_scroll_linked_effect.html | took 1924ms
[task 2022-02-09T22:53:34.745Z] 22:53:34     INFO - TEST-START | gfx/layers/apz/test/mochitest/test_group_scroll_snap.html
[task 2022-02-09T22:53:34.847Z] 22:53:34     INFO - GECKO(15622) | helper_scroll_snap_no_valid_snap_position.html | got MozAfterPaint: 0,0,0,0
[task 2022-02-09T22:53:34.849Z] 22:53:34     INFO - GECKO(15622) | helper_scroll_snap_no_valid_snap_position.html | Dispatching 0 onpaint listeners
[task 2022-02-09T22:53:34.888Z] 22:53:34     INFO - GECKO(15622) | WaitUntilApzStable: flushed APZ repaints in parent proc, waiting for callback...
[task 2022-02-09T22:53:34.889Z] 22:53:34     INFO - GECKO(15622) | WaitUntilApzStable: APZ flush done in parent proc
[task 2022-02-09T22:53:34.891Z] 22:53:34     INFO - GECKO(15622) | helper_scroll_snap_no_valid_snap_position.html | WaitUntilApzStable: got apz-flush-done in child proc
[task 2022-02-09T22:53:34.891Z] 22:53:34     INFO - GECKO(15622) | helper_scroll_snap_no_valid_snap_position.html | WaitUntilApzStable: done promiseFocus
[task 2022-02-09T22:53:34.892Z] 22:53:34     INFO - GECKO(15622) | helper_scroll_snap_no_valid_snap_position.html | done...
[task 2022-02-09T22:53:34.893Z] 22:53:34     INFO - GECKO(15622) | helper_scroll_snap_no_valid_snap_position.html | WaitUntilApzStable: done promiseAllPaintsDone
[task 2022-02-09T22:53:34.894Z] 22:53:34     INFO - GECKO(15622) | helper_scroll_snap_no_valid_snap_position.html | PromiseApzRepaintsFlushed: Flushed APZ repaints, waiting for callback...
[task 2022-02-09T22:53:34.896Z] 22:53:34     INFO - GECKO(15622) | helper_scroll_snap_no_valid_snap_position.html | PromiseApzRepaintsFlushed: APZ flush done
[task 2022-02-09T22:53:34.897Z] 22:53:34     INFO - GECKO(15622) | helper_scroll_snap_no_valid_snap_position.html | WaitUntilApzStable: all done
[task 2022-02-09T22:53:34.955Z] 22:53:34     INFO - GECKO(15622) | helper_scroll_snap_no_valid_snap_position.html | got MozAfterPaint: 0,0,0,0
[task 2022-02-09T22:53:34.957Z] 22:53:34     INFO - GECKO(15622) | helper_scroll_snap_no_valid_snap_position.html | Dispatching 0 onpaint listeners
[task 2022-02-09T22:53:34.990Z] 22:53:34     INFO - GECKO(15622) | MEMORY STAT | vsize 2482MB | residentFast 103MB | heapAllocated 5MB
[task 2022-02-09T22:53:35.030Z] 22:53:35     INFO - TEST-OK | gfx/layers/apz/test/mochitest/test_group_scroll_snap.html | took 829ms
[task 2022-02-09T22:53:35.074Z] 22:53:35     INFO - TEST-START | gfx/layers/apz/test/mochitest/test_group_scrollframe_activation.html
```