Bug: Intermittent browser/components/sessionstore/test/browser_scrollPositions.js | scroll is fine - Got "{\"children\":[null,{\"scroll\":\"682,1158\"}]}", expected "{\"children\":[null,{\"scroll\":\"341,579\"}]}"
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2021-03-10 23:55:22+00:00
Resolved: 2021-07-06 17:00:25+00:00

**Filed by:** cbrindusan [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=332762492&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/TnlOfZCASd6v5WGGJrjDgQ/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/TnlOfZCASd6v5WGGJrjDgQ/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

---
```
[task 2021-03-10T22:52:15.936Z] 22:52:15     INFO - TEST-START | browser/components/sessionstore/test/browser_scrollPositions.js
[task 2021-03-10T22:52:15.958Z] 22:52:15     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 0000020057043400 == 2 [pid = 8232] [id = 8]
[task 2021-03-10T22:52:15.958Z] 22:52:15     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 3 (000002005D8CFAC0) [pid = 8232] [serial = 23] [outer = 0000000000000000]
[task 2021-03-10T22:52:15.958Z] 22:52:15     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 4 (0000020057093000) [pid = 8232] [serial = 24] [outer = 000002005D8CFAC0]
[task 2021-03-10T22:52:16.038Z] 22:52:16     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 5 (000002005D8B4C00) [pid = 8232] [serial = 25] [outer = 000002005D8CFAC0]
[task 2021-03-10T22:52:17.063Z] 22:52:17     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 0000014F69F5DC00 == 4 [pid = 9692] [id = 12]
[task 2021-03-10T22:52:17.063Z] 22:52:17     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 15 (0000014F69F25AC0) [pid = 9692] [serial = 41] [outer = 0000000000000000]
[task 2021-03-10T22:52:17.063Z] 22:52:17     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 16 (0000014F69F61000) [pid = 9692] [serial = 42] [outer = 0000014F69F25AC0]
[task 2021-03-10T22:52:17.102Z] 22:52:17     INFO - GECKO(7020) | [Child 1792: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 000002A61F378800 == 2 [pid = 1792] [id = 4] [url = about:newtab]
[task 2021-03-10T22:52:17.102Z] 22:52:17     INFO - GECKO(7020) | [Child 1792: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 7 (000002A620B263C0) [pid = 1792] [serial = 13] [outer = 0000000000000000] [url = about:newtab]
[task 2021-03-10T22:52:17.102Z] 22:52:17     INFO - GECKO(7020) | [Child 1792: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 6 (000002A620B26040) [pid = 1792] [serial = 10] [outer = 0000000000000000] [url = about:newtab]
[task 2021-03-10T22:52:17.102Z] 22:52:17     INFO - GECKO(7020) | [Child 1792: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 000002A618898800 == 1 [pid = 1792] [id = 3] [url = about:newtab]
[task 2021-03-10T22:52:17.147Z] 22:52:17     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 17 (0000014F6A222800) [pid = 9692] [serial = 43] [outer = 0000014F69F25AC0]
[task 2021-03-10T22:52:17.510Z] 22:52:17     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 18 (0000014F6A225400) [pid = 9692] [serial = 44] [outer = 0000014F69F25AC0]
[task 2021-03-10T22:52:17.588Z] 22:52:17     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 19 (0000014F6A228000) [pid = 9692] [serial = 45] [outer = 0000014F69F25AC0]
[task 2021-03-10T22:52:17.588Z] 22:52:17     INFO - GECKO(7020) | [Child 9692, Main Thread] WARNING: Page was shift reloaded, skipping ServiceWorker control: file /builds/worker/checkouts/gecko/dom/base/Document.cpp:7268
[task 2021-03-10T22:52:17.659Z] 22:52:17     INFO - GECKO(7020) | [Parent 8268: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 00000213E043A000 == 8 [pid = 8268] [id = 13] [url = about:blank]
[task 2021-03-10T22:52:17.659Z] 22:52:17     INFO - GECKO(7020) | [Parent 8268: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 00000213E567B800 == 7 [pid = 8268] [id = 15] [url = about:blank]
[task 2021-03-10T22:52:19.079Z] 22:52:19     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 000002005D8A7800 == 3 [pid = 8232] [id = 9]
[task 2021-03-10T22:52:19.079Z] 22:52:19     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 6 (000002005FCA23C0) [pid = 8232] [serial = 26] [outer = 0000000000000000]
[task 2021-03-10T22:52:19.079Z] 22:52:19     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 7 (000002005D8B3400) [pid = 8232] [serial = 27] [outer = 000002005FCA23C0]
[task 2021-03-10T22:52:19.159Z] 22:52:19     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 8 (000002005DC62000) [pid = 8232] [serial = 28] [outer = 000002005FCA23C0]
[task 2021-03-10T22:52:19.177Z] 22:52:19     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 000002005DC64C00 == 4 [pid = 8232] [id = 10]
[task 2021-03-10T22:52:19.177Z] 22:52:19     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 9 (000002005FCA2740) [pid = 8232] [serial = 29] [outer = 0000000000000000]
[task 2021-03-10T22:52:19.177Z] 22:52:19     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 000002005FC37400 == 5 [pid = 8232] [id = 11][task 2021-03-10T22:52:19.177Z] 22:52:19     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 10 (000002005FCA2AC0) [pid = 8232] [serial = 30] [outer = 0000000000000000]
[task 2021-03-10T22:52:19.228Z] 22:52:19     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 11 (000002005FC3B400) [pid = 8232] [serial = 31] [outer = 000002005FCA2740]
[task 2021-03-10T22:52:19.233Z] 22:52:19     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 12 (000002005FC3E800) [pid = 8232] [serial = 32] [outer = 000002005FCA2AC0]
[task 2021-03-10T22:52:19.954Z] 22:52:19     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 0000014F684A7400 == 3 [pid = 9692] [id = 11] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:19.954Z] 22:52:19     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 0000014F69F5DC00 == 2 [pid = 9692] [id = 12] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:19.954Z] 22:52:19     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 0000014F61E41400 == 1 [pid = 9692] [id = 7] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample_frameset.html]
[task 2021-03-10T22:52:19.954Z] 22:52:19     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 0000014F61E3C400 == 0 [pid = 9692] [id = 10] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample2.html]
[task 2021-03-10T22:52:20.034Z] 22:52:20     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 18 (0000014F69F25AC0) [pid = 9692] [serial = 41] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:20.034Z] 22:52:20     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 17 (0000014F69FAD580) [pid = 9692] [serial = 30] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:20.034Z] 22:52:20     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 16 (0000014F684C3C80) [pid = 9692] [serial = 26] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample_frameset.html]
[task 2021-03-10T22:52:20.034Z] 22:52:20     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 15 (0000014F69FAD040) [pid = 9692] [serial = 29] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:20.034Z] 22:52:20     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 14 (0000014F684C3E40) [pid = 9692] [serial = 33] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample2.html]
[task 2021-03-10T22:52:20.034Z] 22:52:20     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 13 (0000014F69F25200) [pid = 9692] [serial = 37] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:20.056Z] 22:52:20     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 000001A75C3B7400 == 3 [pid = 9060] [id = 3] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample_frameset.html]
[task 2021-03-10T22:52:20.056Z] 22:52:20     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 000001A75C3B7800 == 2 [pid = 9060] [id = 7] [url = about:blank]
[task 2021-03-10T22:52:20.056Z] 22:52:20     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 000001A7561A8000 == 1 [pid = 9060] [id = 6] [url = about:blank]
[task 2021-03-10T22:52:20.096Z] 22:52:20     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 13 (000001A75C3253C0) [pid = 9060] [serial = 9] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample_frameset.html]
[task 2021-03-10T22:52:20.096Z] 22:52:20     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 12 (000001A75C325E40) [pid = 9060] [serial = 13] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:20.096Z] 22:52:20     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 11 (000001A75C325AC0) [pid = 9060] [serial = 12] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:20.096Z] 22:52:20     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 10 (000001A75C325580) [pid = 9060] [serial = 19] [outer = 0000000000000000] [url = about:blank]
[task 2021-03-10T22:52:20.096Z] 22:52:20     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 9 (000001A75C325040) [pid = 9060] [serial = 16] [outer = 0000000000000000] [url = about:blank]
[task 2021-03-10T22:52:21.072Z] 22:52:21     INFO - GECKO(7020) | [Child 1792: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 5 (000002A62351AC00) [pid = 1792] [serial = 15] [outer = 0000000000000000] [url = about:newtab]
[task 2021-03-10T22:52:21.072Z] 22:52:21     INFO - GECKO(7020) | [Child 1792: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 4 (000002A62294C400) [pid = 1792] [serial = 14] [outer = 0000000000000000] [url = about:blank]
[task 2021-03-10T22:52:21.072Z] 22:52:21     INFO - GECKO(7020) | [Child 1792: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 3 (000002A621241800) [pid = 1792] [serial = 12] [outer = 0000000000000000] [url = about:newtab]
[task 2021-03-10T22:52:21.072Z] 22:52:21     INFO - GECKO(7020) | [Child 1792: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 2 (000002A61EFA5400) [pid = 1792] [serial = 11] [outer = 0000000000000000] [url = about:blank]
[task 2021-03-10T22:52:22.177Z] 22:52:22     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 0000014F61E25400 == 1 [pid = 9692] [id = 13]
[task 2021-03-10T22:52:22.177Z] 22:52:22     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 14 (0000014F684C3C80) [pid = 9692] [serial = 46] [outer = 0000000000000000]
[task 2021-03-10T22:52:22.177Z] 22:52:22     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 15 (0000014F61E9A000) [pid = 9692] [serial = 47] [outer = 0000014F684C3C80]
[task 2021-03-10T22:52:22.278Z] 22:52:22     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 16 (0000014F6A21E400) [pid = 9692] [serial = 48] [outer = 0000014F684C3C80]
[task 2021-03-10T22:52:22.288Z] 22:52:22     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 0000014F6A221800 == 2 [pid = 9692] [id = 14]
[task 2021-03-10T22:52:22.288Z] 22:52:22     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 17 (0000014F69FAD040) [pid = 9692] [serial = 49] [outer = 0000000000000000]
[task 2021-03-10T22:52:22.289Z] 22:52:22     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 0000014F6A223400 == 3 [pid = 9692] [id = 15]
[task 2021-03-10T22:52:22.289Z] 22:52:22     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 18 (0000014F69FAD580) [pid = 9692] [serial = 50] [outer = 0000000000000000]
[task 2021-03-10T22:52:22.339Z] 22:52:22     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 19 (0000014F6A228800) [pid = 9692] [serial = 51] [outer = 0000014F69FAD040]
[task 2021-03-10T22:52:22.344Z] 22:52:22     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 20 (0000014F6B806400) [pid = 9692] [serial = 52] [outer = 0000014F69FAD580]
[task 2021-03-10T22:52:23.970Z] 22:52:23     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 000002005D8B2C00 == 4 [pid = 8232] [id = 7] [url = about:blank][task 2021-03-10T22:52:23.970Z] 22:52:23     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 0000020057043400 == 3 [pid = 8232] [id = 8] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:24.008Z] 22:52:24     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 11 (000002005D8CFAC0) [pid = 8232] [serial = 23] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:24.008Z] 22:52:24     INFO - GECKO(7020) | [Child 8232: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 10 (000002005D8CFE40) [pid = 8232] [serial = 21] [outer = 0000000000000000] [url = about:blank]
[task 2021-03-10T22:52:24.059Z] 22:52:24     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 19 (0000014F69F61000) [pid = 9692] [serial = 42] [outer = 0000000000000000] [url = about:blank]
[task 2021-03-10T22:52:24.059Z] 22:52:24     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 18 (0000014F69F5B800) [pid = 9692] [serial = 38] [outer = 0000000000000000] [url = about:blank]
[task 2021-03-10T22:52:24.059Z] 22:52:24     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 17 (0000014F6A21DC00) [pid = 9692] [serial = 28] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample_frameset.html]
[task 2021-03-10T22:52:24.059Z] 22:52:24     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 16 (0000014F6A225800) [pid = 9692] [serial = 31] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:24.060Z] 22:52:24     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 15 (0000014F6A227800) [pid = 9692] [serial = 32] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:24.060Z] 22:52:24     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 14 (0000014F69F5B000) [pid = 9692] [serial = 35] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:24.060Z] 22:52:24     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 13 (0000014F6A222800) [pid = 9692] [serial = 43] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:24.060Z] 22:52:24     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 12 (0000014F6A225400) [pid = 9692] [serial = 44] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:24.060Z] 22:52:24     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 11 (0000014F6A222000) [pid = 9692] [serial = 40] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:24.060Z] 22:52:24     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 10 (0000014F6A228000) [pid = 9692] [serial = 45] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:24.060Z] 22:52:24     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 9 (0000014F684A4000) [pid = 9692] [serial = 34] [outer = 0000000000000000] [url = about:blank]
[task 2021-03-10T22:52:24.060Z] 22:52:24     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 8 (0000014F6A220400) [pid = 9692] [serial = 39] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample2.html]
[task 2021-03-10T22:52:24.061Z] 22:52:24     INFO - GECKO(7020) | [Child 9692: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 7 (0000014F6A21B800) [pid = 9692] [serial = 36] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample2.html]
[task 2021-03-10T22:52:24.150Z] 22:52:24     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 8 (000001A75C3B3000) [pid = 9060] [serial = 17] [outer = 0000000000000000] [url = about:blank]
[task 2021-03-10T22:52:24.150Z] 22:52:24     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 7 (000001A75E91B800) [pid = 9060] [serial = 18] [outer = 0000000000000000] [url = about:blank]
[task 2021-03-10T22:52:24.150Z] 22:52:24     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 6 (000001A75E921400) [pid = 9060] [serial = 21] [outer = 0000000000000000] [url = about:blank]
[task 2021-03-10T22:52:24.150Z] 22:52:24     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 5 (000001A75E927800) [pid = 9060] [serial = 15] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:24.150Z] 22:52:24     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 4 (000001A75E926000) [pid = 9060] [serial = 14] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample.html]
[task 2021-03-10T22:52:24.150Z] 22:52:24     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 3 (000001A75CC64C00) [pid = 9060] [serial = 11] [outer = 0000000000000000] [url = http://example.com/browser/browser/components/sessionstore/test/browser_scrollPositions_sample_frameset.html]
[task 2021-03-10T22:52:24.151Z] 22:52:24     INFO - GECKO(7020) | [Child 9060: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 2 (000001A75C3B9000) [pid = 9060] [serial = 20] [outer = 0000000000000000] [url = about:blank]
[task 2021-03-10T22:52:25.074Z] 22:52:25     INFO - GECKO(7020) | [Child 1792, Main Thread] WARNING: '!aContent->GetComposedDoc()', file /builds/worker/checkouts/gecko/layout/base/nsCSSFrameConstructor.cpp:8404
[task 2021-03-10T22:52:25.074Z] 22:52:25     INFO - GECKO(7020) | [Child 1792, Main Thread] WARNING: '!aContent->GetComposedDoc()', file /builds/worker/checkouts/gecko/layout/base/nsCSSFrameConstructor.cpp:8404
[task 2021-03-10T22:52:25.096Z] 22:52:25     INFO - GECKO(7020) | [Child 1792, Main Thread] WARNING: '!aContent->GetComposedDoc()', file /builds/worker/checkouts/gecko/layout/base/nsCSSFrameConstructor.cpp:8404
[task 2021-03-10T22:52:25.098Z] 22:52:25     INFO - GECKO(7020) | [Child 1792, Main Thread] WARNING: '!aContent->GetComposedDoc()', file /builds/worker/checkouts/gecko/layout/base/nsCSSFrameConstructor.cpp:8404
[task 2021-03-10T22:52:25.100Z] 22:52:25     INFO - GECKO(7020) | [Child 1792, Main Thread] WARNING: '!aContent->GetComposedDoc()', file /builds/worker/checkouts/gecko/layout/base/nsCSSFrameConstructor.cpp:8404
[task 2021-03-10T22:52:25.102Z] 22:52:25     INFO - GECKO(7020) | [Child 1792, Main Thread] WARNING: '!aContent->GetComposedDoc()', file /builds/worker/checkouts/gecko/layout/base/nsCSSFrameConstructor.cpp:8404
[task 2021-03-10T22:52:26.179Z] 22:52:26     INFO - TEST-INFO | started process screenshot
[task 2021-03-10T22:52:26.249Z] 22:52:26     INFO - TEST-INFO | screenshot: exit 0
[task 2021-03-10T22:52:26.249Z] 22:52:26     INFO - Buffered messages logged at 22:52:15
[task 2021-03-10T22:52:26.249Z] 22:52:26     INFO - Entering test bound test_scroll
[task 2021-03-10T22:52:26.249Z] 22:52:26     INFO - Buffered messages logged at 22:52:17
[task 2021-03-10T22:52:26.249Z] 22:52:26     INFO - TEST-PASS | browser/components/sessionstore/test/browser_scrollPositions.js | scroll is fine - 
[task 2021-03-10T22:52:26.249Z] 22:52:26     INFO - TEST-PASS | browser/components/sessionstore/test/browser_scrollPositions.js | scroll position has been duplicated correctly - 
[task 2021-03-10T22:52:26.249Z] 22:52:26     INFO - TEST-PASS | browser/components/sessionstore/test/browser_scrollPositions.js | reloading retains scroll positions - 
[task 2021-03-10T22:52:26.250Z] 22:52:26     INFO - TEST-PASS | browser/components/sessionstore/test/browser_scrollPositions.js | force-reload resets scroll positions - 
[task 2021-03-10T22:52:26.250Z] 22:52:26     INFO - Buffered messages logged at 22:52:19[task 2021-03-10T22:52:26.250Z] 22:52:26     INFO - TEST-PASS | browser/components/sessionstore/test/browser_scrollPositions.js | no scroll stored - 
[task 2021-03-10T22:52:26.250Z] 22:52:26     INFO - Leaving test bound test_scroll
[task 2021-03-10T22:52:26.250Z] 22:52:26     INFO - Entering test bound test_scroll_nested
[task 2021-03-10T22:52:26.250Z] 22:52:26     INFO - Buffered messages logged at 22:52:20
[task 2021-03-10T22:52:26.250Z] 22:52:26     INFO - TEST-PASS | browser/components/sessionstore/test/browser_scrollPositions.js | scroll is fine - 
[task 2021-03-10T22:52:26.250Z] 22:52:26     INFO - Buffered messages logged at 22:52:22
[task 2021-03-10T22:52:26.250Z] 22:52:26     INFO - TEST-PASS | browser/components/sessionstore/test/browser_scrollPositions.js | scroll is fine - 
[task 2021-03-10T22:52:26.250Z] 22:52:26     INFO - TEST-PASS | browser/components/sessionstore/test/browser_scrollPositions.js | scroll position #1 has been duplicated correctly - 
[task 2021-03-10T22:52:26.250Z] 22:52:26     INFO - TEST-PASS | browser/components/sessionstore/test/browser_scrollPositions.js | scroll position #2 has been duplicated correctly - 
[task 2021-03-10T22:52:26.251Z] 22:52:26     INFO - Buffered messages finished
[task 2021-03-10T22:52:26.251Z] 22:52:26     INFO - TEST-UNEXPECTED-FAIL | browser/components/sessionstore/test/browser_scrollPositions.js | scroll is fine - Got "{\"children\":[null,{\"scroll\":\"682,1158\"}]}", expected "{\"children\":[null,{\"scroll\":\"341,579\"}]}"```