Bug: Permanent failure line for successful tasks TypeError: can't access property "_loadBlockedDigests", this is null: _updateExperimentState@resource:///modules/UrlbarProviderQuickSuggest.jsm:874:7 - DO NOT USE FOR CLASSIFICATION
Status: RESOLVED
Priority: P2
Resolution: FIXED
Created: 2022-02-22 10:07:01+00:00
Resolved: 2022-02-28 06:15:00+00:00

**Filed by:** archaeopteryx [at] coole-files.de
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=368699104&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/HN9LbRw2R6qDpvvbkZ8rYQ/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/HN9LbRw2R6qDpvvbkZ8rYQ/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

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```
Failure line logged by many frontend test tasks, code added in bug 1754591. The tasks have a success exit code because no test fails.

[task 2022-02-22T07:24:20.643Z] 07:24:20     INFO - Calling ['/builds/worker/workspace/build/venv/bin/python', '-u', '/builds/worker/workspace/build/tests/reftest/runreftest.py', '--total-chunks', '32', '--this-chunk', '22', '--setpref=fission.autostart=true', '--setpref=media.peerconnection.mtransport_process=false', '--setpref=network.process.enabled=false', '--setpref=layers.d3d11.enable-blacklist=false', '--appname=/builds/worker/workspace/build/application/firefox/firefox', '--utility-path=tests/bin', '--extra-profile-file=tests/bin/plugins', '--symbols-path=https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Gau9IefbTZOVH3Y2J9VEug/artifacts/public/build/target.crashreporter-symbols.zip', '--log-raw=/builds/worker/workspace/build/blobber_upload_dir/crashtest_raw.log', '--log-errorsummary=/builds/worker/workspace/build/blobber_upload_dir/crashtest_errorsummary.log', '--cleanup-crashes', '--marionette-startup-timeout=180', '--sandbox-read-whitelist=/builds/worker/workspace/build', '--log-raw=-', '--suite=crashtest', '--topsrcdir=tests/reftest/tests', '--', 'tests/reftest/tests/testing/crashtest/crashtests.list'] with output_timeout 1000
[task 2022-02-22T07:24:20.932Z] 07:24:20     INFO - REFTEST INFO | Running with e10s: True
[task 2022-02-22T07:24:20.933Z] 07:24:20     INFO - REFTEST INFO | Running with fission: True
[task 2022-02-22T07:24:20.933Z] 07:24:20     INFO - REFTEST INFO | INFO | runtests.py | TSan using symbolizer at /builds/worker/workspace/build/application/firefox/llvm-symbolizer
[task 2022-02-22T07:24:20.934Z] 07:24:20     INFO - REFTEST INFO | Application command: /builds/worker/workspace/build/application/firefox/firefox -marionette -profile /tmp/tmpcw0a40ll.mozrunner
[task 2022-02-22T07:24:25.568Z] 07:24:25     INFO - 1645514665567	Marionette	INFO	Marionette enabled
[task 2022-02-22T07:24:26.389Z] 07:24:26     INFO - 1645514666388	Marionette	TRACE	Received observer notification toplevel-window-ready
[task 2022-02-22T07:24:38.687Z] 07:24:38     INFO - console.error:
[task 2022-02-22T07:24:38.701Z] 07:24:38     INFO -   TypeError: can't access property "_loadBlockedDigests", this is null: _updateExperimentState@resource:///modules/UrlbarProviderQuickSuggest.jsm:874:7
[task 2022-02-22T07:24:38.703Z] 07:24:38     INFO - emit@resource://gre/modules/EventEmitter.jsm:160:20
[task 2022-02-22T07:24:38.703Z] 07:24:38     INFO - _emitFeatureUpdate@resource://nimbus/lib/ExperimentStore.jsm:372:10
[task 2022-02-22T07:24:38.705Z] 07:24:38     INFO - _ExperimentFeature/</<@resource://nimbus/ExperimentAPI.jsm:359:34
[task 2022-02-22T07:24:38.705Z] 07:24:38     INFO - observe@resource://gre/modules/XPCOMUtils.jsm:329:22
[task 2022-02-22T07:24:38.706Z] 07:24:38     INFO - _updateFirefoxSuggestScenarioHelper@resource:///modules/UrlbarPrefs.jsm:778:16
[task 2022-02-22T07:24:38.706Z] 07:24:38     INFO - updateFirefoxSuggestScenario@resource:///modules/UrlbarPrefs.jsm:649:12
```