#[markdown(off)]
Filed by: egao [at] mozilla.com

https://treeherder.mozilla.org/logviewer.html#?job_id=233501438&repo=try

https://queue.taskcluster.net/v1/task/Doc7bcI5R-aAxFZp245xzw/runs/0/artifacts/public/logs/live_backing.log

Test: bc7

Context:

23:31:31 INFO - TEST-START | browser/components/extensions/test/browser/test-oop-extensions/browser_ext_slow_script.js
23:31:31 INFO - GECKO(10844) | [Parent 8344, Gecko_IOThread] WARNING: pipe error: 109: file z:/build/build/src/ipc/chromium/src/chrome/common/ipc_channel_win.cc, line 341
23:37:41 INFO - Buffered messages logged at 23:31:31
23:37:41 INFO - Entering test bound test_slow_content_script
23:37:41 INFO - Extension loaded
23:37:41 INFO - Console message: Warning: attempting to write 23435 bytes to preference extensions.webextensions.uuids. This is bad for general performance and memory usage. Such an amount of data should rather be written to an external file. This preference will not be sent to any content processes.
23:37:41 INFO - Buffered messages finished
23:37:41 ERROR - TEST-UNEXPECTED-TIMEOUT | browser/components/extensions/test/browser/test-oop-extensions/browser_ext_slow_script.js | application timed out after 370 seconds with no output
23:37:41 ERROR - Force-terminating active process(es).
23:37:41 INFO - Determining child pids from psutil...
23:37:41 INFO - [8344]
23:37:41 INFO - ==> process 8344 launched child process 7060 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.0.2061754719\16175469" -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 2496 gpu)
23:37:41 INFO - ==> process 8344 launched child process 10640 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.6.661265076\512843749" -childID 1 -isForBrowser -prefsHandle 2800 -prefMapHandle 2796 -prefsLen 1 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 2936 tab)
23:37:41 INFO - ==> process 8344 launched child process 2524 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.13.124434704\391784580" -childID 2 -isForBrowser -prefsHandle 3064 -prefMapHandle 3184 -prefsLen 132 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 2856 tab)
23:37:41 INFO - ==> process 8344 launched child process 10876 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.20.1957347318\1534712089" -childID 3 -isForBrowser -prefsHandle 2272 -prefMapHandle 3332 -prefsLen 132 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 2892 tab)
23:37:41 INFO - ==> process 8344 launched child process 8432 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.27.23027108\1632914325" -childID 4 -isForBrowser -prefsHandle 4164 -prefMapHandle 4168 -prefsLen 8581 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 4204 tab)
23:37:41 INFO - ==> process 8344 launched child process 10104 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.34.905191857\2053915696" -childID 5 -isForBrowser -prefsHandle 4500 -prefMapHandle 4504 -prefsLen 8628 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 4388 tab)
23:37:41 INFO - ==> process 8344 launched child process 10740 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.41.1380934672\1395604887" -childID 6 -isForBrowser -prefsHandle 4480 -prefMapHandle 4864 -prefsLen 8783 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 4800 tab)
23:37:41 INFO - ==> process 8344 launched child process 1808 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.48.1148472092\2015013011" -childID 7 -isForBrowser -prefsHandle 4636 -prefMapHandle 4716 -prefsLen 9099 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 5180 tab)
23:37:41 INFO - ==> process 8344 launched child process 8136 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.55.99140718\1870452503" -childID 8 -isForBrowser -prefsHandle 5304 -prefMapHandle 5056 -prefsLen 9317 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 4844 tab)
23:37:41 INFO - ==> process 8344 launched child process 7848 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.62.561238508\2060222829" -childID 9 -isForBrowser -prefsHandle 5756 -prefMapHandle 5780 -prefsLen 10451 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 5788 tab)
23:37:41 INFO - ==> process 8344 launched child process 5820 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.69.796440854\566490479" -childID 10 -isForBrowser -prefsHandle 6016 -prefMapHandle 6020 -prefsLen 10451 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 5816 tab)
23:37:41 INFO - ==> process 8344 launched child process 10448 ("C:\tasks\task_1552432518\build\application\firefox\plugin-container.exe" --channel="8344.76.801540806\1588884280" "C:\Users\testdroid\AppData\Local\Temp\tmp3ehjvg.mozrunner\plugins\nptest.dll" "C:\Users\testdroid\AppData\LocalLow\Mozilla\Temp-{0c5634f0-d658-4beb-8ede-d3dd28e98bb3}" "C:\Users\testdroid\AppData\Roaming\Adobe\\" -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 7528 plugin)
23:37:41 INFO - ==> process 8344 launched child process 9812 ("C:\tasks\task_1552432518\build\application\firefox\plugin-container.exe" --channel="8344.80.957154322\64072889" "C:\Users\testdroid\AppData\Local\Temp\tmp3ehjvg.mozrunner\plugins\npswftest.dll" "C:\Users\testdroid\AppData\LocalLow\Mozilla\Temp-{0c5634f0-d658-4beb-8ede-d3dd28e98bb3}" "C:\Users\testdroid\AppData\Roaming\Adobe\\" -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 7812 plugin)
23:37:41 INFO - ==> process 8344 launched child process 7992 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.84.1300942923\1519739210" -childID 11 -isForBrowser -prefsHandle 3380 -prefMapHandle 11320 -prefsLen 11168 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 11708 tab)
23:37:41 INFO - ==> process 8344 launched child process 6876 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.91.1787317198\312475409" -childID 12 -isForBrowser -prefsHandle 11520 -prefMapHandle 3432 -prefsLen 11168 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 11408 tab)
23:37:41 INFO - ==> process 8344 launched child process 9968 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.98.1570542524\1297075054" -childID 13 -isForBrowser -prefsHandle 4504 -prefMapHandle 13224 -prefsLen 11444 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 4616 tab)
23:37:41 INFO - Found child pids: set([8432, 5820, 6876, 8136, 2524, 7848, 10448, 7992, 10640, 10104, 7060, 8344, 10740, 9812, 10876, 9968, 1808])

then

23:37:42 ERROR - TEST-UNEXPECTED-FAIL | browser/components/extensions/test/browser/test-oop-extensions/browser_ext_slow_script.js | application terminated with exit code 1
23:37:42 INFO - runtests.py | Application ran for: 0:11:52.585000
23:37:42 INFO - zombiecheck | Reading PID log: c:\users\testdr~1\appdata\local\temp\tmpgkuqphpidlog
23:37:42 INFO - ==> process 8344 launched child process 7060 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.0.2061754719\16175469" -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 2496 gpu)
23:37:42 INFO - ==> process 8344 launched child process 10640 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.6.661265076\512843749" -childID 1 -isForBrowser -prefsHandle 2800 -prefMapHandle 2796 -prefsLen 1 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 2936 tab)
23:37:42 INFO - ==> process 8344 launched child process 2524 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.13.124434704\391784580" -childID 2 -isForBrowser -prefsHandle 3064 -prefMapHandle 3184 -prefsLen 132 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 2856 tab)
23:37:42 INFO - ==> process 8344 launched child process 10876 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.20.1957347318\1534712089" -childID 3 -isForBrowser -prefsHandle 2272 -prefMapHandle 3332 -prefsLen 132 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 2892 tab)
23:37:42 INFO - ==> process 8344 launched child process 8432 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.27.23027108\1632914325" -childID 4 -isForBrowser -prefsHandle 4164 -prefMapHandle 4168 -prefsLen 8581 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 4204 tab)
23:37:42 INFO - ==> process 8344 launched child process 10104 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.34.905191857\2053915696" -childID 5 -isForBrowser -prefsHandle 4500 -prefMapHandle 4504 -prefsLen 8628 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 4388 tab)
23:37:42 INFO - ==> process 8344 launched child process 10740 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.41.1380934672\1395604887" -childID 6 -isForBrowser -prefsHandle 4480 -prefMapHandle 4864 -prefsLen 8783 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 4800 tab)
23:37:42 INFO - ==> process 8344 launched child process 1808 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.48.1148472092\2015013011" -childID 7 -isForBrowser -prefsHandle 4636 -prefMapHandle 4716 -prefsLen 9099 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 5180 tab)
23:37:42 INFO - ==> process 8344 launched child process 8136 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.55.99140718\1870452503" -childID 8 -isForBrowser -prefsHandle 5304 -prefMapHandle 5056 -prefsLen 9317 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 4844 tab)
23:37:42 INFO - ==> process 8344 launched child process 7848 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.62.561238508\2060222829" -childID 9 -isForBrowser -prefsHandle 5756 -prefMapHandle 5780 -prefsLen 10451 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 5788 tab)
23:37:42 INFO - ==> process 8344 launched child process 5820 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.69.796440854\566490479" -childID 10 -isForBrowser -prefsHandle 6016 -prefMapHandle 6020 -prefsLen 10451 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 5816 tab)
23:37:42 INFO - ==> process 8344 launched child process 10448 ("C:\tasks\task_1552432518\build\application\firefox\plugin-container.exe" --channel="8344.76.801540806\1588884280" "C:\Users\testdroid\AppData\Local\Temp\tmp3ehjvg.mozrunner\plugins\nptest.dll" "C:\Users\testdroid\AppData\LocalLow\Mozilla\Temp-{0c5634f0-d658-4beb-8ede-d3dd28e98bb3}" "C:\Users\testdroid\AppData\Roaming\Adobe\\" -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 7528 plugin)
23:37:42 INFO - ==> process 8344 launched child process 9812 ("C:\tasks\task_1552432518\build\application\firefox\plugin-container.exe" --channel="8344.80.957154322\64072889" "C:\Users\testdroid\AppData\Local\Temp\tmp3ehjvg.mozrunner\plugins\npswftest.dll" "C:\Users\testdroid\AppData\LocalLow\Mozilla\Temp-{0c5634f0-d658-4beb-8ede-d3dd28e98bb3}" "C:\Users\testdroid\AppData\Roaming\Adobe\\" -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 7812 plugin)
23:37:42 INFO - ==> process 8344 launched child process 7992 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.84.1300942923\1519739210" -childID 11 -isForBrowser -prefsHandle 3380 -prefMapHandle 11320 -prefsLen 11168 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 11708 tab)
23:37:42 INFO - ==> process 8344 launched child process 6876 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.91.1787317198\312475409" -childID 12 -isForBrowser -prefsHandle 11520 -prefMapHandle 3432 -prefsLen 11168 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 11408 tab)
23:37:42 INFO - ==> process 8344 launched child process 9968 ("C:\tasks\task_1552432518\build\application\firefox\firefox.exe" -contentproc --channel="8344.98.1570542524\1297075054" -childID 13 -isForBrowser -prefsHandle 4504 -prefMapHandle 13224 -prefsLen 11444 -prefMapSize 196215 -parentBuildID 20190312160943 -greomni "C:\tasks\task_1552432518\build\application\firefox\omni.ja" -appomni "C:\tasks\task_1552432518\build\application\firefox\browser\omni.ja" -appdir "C:\tasks\task_1552432518\build\application\firefox\browser" - 8344 "\\.\pipe\gecko-crash-server-pipe.8344" 4616 tab)

Previously, this test passed without issues:

19:03:14     INFO - TEST-START | browser/components/extensions/test/browser/test-oop-extensions/browser_ext_slow_script.js
19:03:14     INFO - GECKO(3628) | [Parent 9692, Gecko_IOThread] WARNING: pipe error: 109: file z:/build/build/src/ipc/chromium/src/chrome/common/ipc_channel_win.cc, line 341
19:03:14     INFO - GECKO(3628) | [Child 9508, Chrome_ChildThread] WARNING: pipe error: 109: file z:/build/build/src/ipc/chromium/src/chrome/common/ipc_channel_win.cc, line 341
19:03:14     INFO - GECKO(3628) | [Child 9508, Chrome_ChildThread] WARNING: pipe error: 109: file z:/build/
19:03:21     INFO - GECKO(3628) | JavaScript warning: moz-extension://766adf31-3faa-455c-9bd0-77b308a85130/content.js, line 2: Error: Script terminated by timeout at:
19:03:21     INFO - GECKO(3628) | @moz-extension://766adf31-3faa-455c-9bd0-77b308a85130/content.js:2:22
19:03:21     INFO - GECKO(3628) | @moz-extension://766adf31-3faa-455c-9bd0-77b308a85130/content.js:5:9
19:03:21     INFO - GECKO(3628) | JavaScript error: resource://gre/modules/BrowserUtils.jsm, line 409: TypeError: docShell is null
19:03:21     INFO - GECKO(3628) | MEMORY STAT | vsize 6364MB | vsizeMaxContiguous 67717703MB | residentFast 573MB | heapAllocated 193MB
19:03:21     INFO - TEST-OK | browser/components/extensions/test/browser/test-oop-extensions/browser_ext_slow_script.js | took 7322ms

So it would appear this is an intermittent failure for windows10-aarch64 at least.