[quibble-vendor-selenium-docker](https://integration.wikimedia.org/ci/job/quibble-vendor-selenium-docker/) has been consistently failing since 7:24 UTC today ([#6196](https://integration.wikimedia.org/ci/job/quibble-vendor-selenium-docker/6196/)); the last successful build was 2:52 UTC today ([#6195](https://integration.wikimedia.org/ci/job/quibble-vendor-selenium-docker/6195/)). All affected builds seem to belong to the mediawiki/extensions/Wikibase project, though I’m not sure if this is because no one else has needed a build yet or because no other extension uses this job. (Wikibase uses it for both test and gate-and-submit, so this currently **blocks Wikibase merges.**)
The errors always seem to be similar:
```lines=25
…
08:30:48 INFO:backend.DevWebServer:[Fri Mar 27 07:30:48 2020] 127.0.0.1:58372 [200]: /api.php
08:30:48 INFO:backend.DevWebServer:[Fri Mar 27 07:30:48 2020] 127.0.0.1:58374 [302]: /index.php?title=BeforeEach-name-0.018402745643243845-I%C3%B1t%C3%ABrn%C3%A2ti%C3%B4n%C3%A0liz%C3%A6ti%C3%B8n&action=submit
08:30:48 INFO:backend.DevWebServer:[Fri Mar 27 07:30:48 2020] 127.0.0.1:58376 [200]: /index.php/BeforeEach-name-0.018402745643243845-I%C3%B1t%C3%ABrn%C3%A2ti%C3%B4n%C3%A0liz%C3%A6ti%C3%B8n
08:30:48 [0-1]
08:30:48 Video location: /workspace/log/Page-should-be-creatable.mp4
08:30:48
08:30:48 [0-1] ffmpeg exited with code 255 /workspace/log/Page-should-be-creatable.mp4
08:30:48 INFO:backend.DevWebServer:[Fri Mar 27 07:30:48 2020] 127.0.0.1:58390 [200]: //api.php?format=json
08:30:49 INFO:backend.DevWebServer:[Fri Mar 27 07:30:49 2020] 127.0.0.1:58392 [200]: //index.php?action=edit&vehidebetadialog=1&hidewelcomedialog=1&title=BeforeEach-name-0.4907293959673391-I%C3%B1t%C3%ABrn%C3%A2ti%C3%B4n%C3%A0liz%C3%A6ti%C3%B8n
08:30:49 [0-1]
08:30:49 Video location: /workspace/log/Page-should-be-previewable.mp4
08:30:49
08:30:49 [0-1] ffmpeg exited with code 255 /workspace/log/Page-should-be-previewable.mp4
08:30:49 INFO:backend.DevWebServer:[Fri Mar 27 07:30:49 2020] 127.0.0.1:58398 [200]: /api.php
08:30:49 INFO:backend.DevWebServer:[Fri Mar 27 07:30:49 2020] 127.0.0.1:58400 [200]: /api.php
08:30:49 INFO:backend.DevWebServer:[Fri Mar 27 07:30:49 2020] 127.0.0.1:58402 [302]: /index.php?title=BeforeEach-name-0.4907293959673391-I%C3%B1t%C3%ABrn%C3%A2ti%C3%B4n%C3%A0liz%C3%A6ti%C3%B8n&action=submit
08:30:49 INFO:backend.DevWebServer:[Fri Mar 27 07:30:49 2020] 127.0.0.1:58404 [200]: /index.php?title=BeforeEach-name-0.4907293959673391-I%C3%B1t%C3%ABrn%C3%A2ti%C3%B4n%C3%A0liz%C3%A6ti%C3%B8n&stable=0
08:30:50 INFO:backend.DevWebServer:[Fri Mar 27 07:30:50 2020] 127.0.0.1:58418 [200]: //api.php?format=json
08:30:50 INFO:backend.DevWebServer:[Fri Mar 27 07:30:50 2020] PHP Warning: Parameter 1 to FlaggedRevsUIHooks::addToHistView() expected to be a reference, value given in /workspace/src/includes/Hooks.php on line 174
08:30:50 INFO:backend.DevWebServer:[Fri Mar 27 07:30:50 2020] 127.0.0.1:58420 [200]: //index.php?action=history&title=BeforeEach-name-0.737587580245509-I%C3%B1t%C3%ABrn%C3%A2ti%C3%B4n%C3%A0liz%C3%A6ti%C3%B8n
08:30:51 [0-1]
08:30:51 Video location: /workspace/log/Page-should-be-re-creatable.mp4
08:30:51
08:30:51 [0-1] ffmpeg exited with code 255 /workspace/log/Page-should-be-re-creatable.mp4
08:30:52 [0-1]
08:30:52 Video location: /workspace/log/Page-should-be-editable-%40daily.mp4
08:30:52
08:30:52 [0-1] ffmpeg exited with code 255 /workspace/log/Page-should-be-editable-%40daily.mp4
08:31:50 [0-1] Error in "Page should have history @daily"
08:31:50 Timeout of 60000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/workspace/src/tests/selenium/specs/page.js)
08:31:50 [0-1]
08:31:50 Video location: /workspace/log/Page-should-have-history-%40daily.mp4
08:31:50
08:31:50 [0-1] ffmpeg exited with code 255 /workspace/log/Page-should-have-history-%40daily.mp4
08:32:50 [0-1] Error in ""after each" hook for "should have history @daily""
08:32:50 Timeout of 60000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves.
08:35:50 WARNING:backend.ChromeWebDriver:[1585294550.353][SEVERE]: Timed out receiving message from renderer: 299.857
08:35:50 WARNING:backend.ChromeWebDriver:[1585294550.357][SEVERE]: Timed out receiving message from renderer: -0.005
08:40:50 WARNING:backend.ChromeWebDriver:[1585294850.367][SEVERE]: Timed out receiving message from renderer: 300.000
08:40:51 WARNING:backend.ChromeWebDriver:[1585294850.373][SEVERE]: Timed out receiving message from renderer: -0.007
08:40:51 [0-1] 2020-03-27T07:40:50.470Z ERROR webdriver: Request failed due to Error: invalid session id
08:40:51 (Driver info: chromedriver=73.0.3683.75,platform=Linux 4.9.0-11-amd64 x86_64)
08:40:51 at getErrorFromResponseBody (/workspace/src/node_modules/webdriver/build/utils.js:175:10)
08:40:51 at Request._callback (/workspace/src/node_modules/webdriver/build/request.js:110:64)
08:40:51 at Request.self.callback (/workspace/src/node_modules/request/request.js:185:22)
08:40:51 at Request.emit (events.js:189:13)
08:40:51 at Request.EventEmitter.emit (domain.js:441:20)
08:40:51 at Request.<anonymous> (/workspace/src/node_modules/request/request.js:1161:10)
08:40:51 at Request.emit (events.js:189:13)
08:40:51 at Request.EventEmitter.emit (domain.js:441:20)
08:40:51 at IncomingMessage.<anonymous> (/workspace/src/node_modules/request/request.js:1083:12)
08:40:51 at Object.onceWrapper (events.js:277:13)
08:40:51 at IncomingMessage.emit (events.js:194:15)
08:40:51 at IncomingMessage.EventEmitter.emit (domain.js:441:20)
08:40:51 at endReadableNT (_stream_readable.js:1103:12)
08:40:51 at process._tickCallback (internal/process/next_tick.js:63:19)
08:40:51 [0-1] 2020-03-27T07:40:50.475Z ERROR webdriver: Request failed due to Error: invalid session id
08:40:51 (Driver info: chromedriver=73.0.3683.75,platform=Linux 4.9.0-11-amd64 x86_64)
08:40:51 at getErrorFromResponseBody (/workspace/src/node_modules/webdriver/build/utils.js:175:10)
08:40:51 at Request._callback (/workspace/src/node_modules/webdriver/build/request.js:110:64)
08:40:51 at Request.self.callback (/workspace/src/node_modules/request/request.js:185:22)
08:40:51 at Request.emit (events.js:189:13)
08:40:51 at Request.EventEmitter.emit (domain.js:441:20)
08:40:51 at Request.<anonymous> (/workspace/src/node_modules/request/request.js:1161:10)
08:40:51 at Request.emit (events.js:189:13)
08:40:51 at Request.EventEmitter.emit (domain.js:441:20)
08:40:51 at IncomingMessage.<anonymous> (/workspace/src/node_modules/request/request.js:1083:12)
08:40:51 at Object.onceWrapper (events.js:277:13)
08:40:51 at IncomingMessage.emit (events.js:194:15)
08:40:51 at IncomingMessage.EventEmitter.emit (domain.js:441:20)
08:40:51 at endReadableNT (_stream_readable.js:1103:12)
08:40:51 at process._tickCallback (internal/process/next_tick.js:63:19)
08:40:51 [0-1] 2020-03-27T07:40:50.476Z ERROR @wdio/sync: Error: invalid session id
08:40:51 (Driver info: chromedriver=73.0.3683.75,platform=Linux 4.9.0-11-amd64 x86_64)
08:40:51 at endReadableNT (_stream_readable.js:1103:12)
08:40:51 at Object.afterTest (/workspace/src/tests/selenium/wdio.conf.js:169:11)
08:40:51 [0-1] FAILED in chrome - /tests/selenium/specs/page.js
08:40:51 [0-2] RUNNING in chrome - /tests/selenium/specs/rollback.js
…
08:41:15 [0-5] PASSED in chrome - /tests/selenium/specs/user.js
08:41:16
08:41:16 "dot" Reporter:
08:41:16 .....FF...........
08:41:16
08:41:16 Spec Files: 5 passed, 1 failed, 6 total (100% completed) in 00:10:38
08:41:16
08:41:16 npm ERR! code ELIFECYCLE
08:41:16 npm ERR! errno 1
08:41:16 npm ERR! @ selenium-test: `wdio ./tests/selenium/wdio.conf.js`
08:41:16 npm ERR! Exit status 1
…
```
As far as I can tell, those are MediaWiki core browser tests failing ([`tests/selenium/specs/page.js`](https://gerrit.wikimedia.org/g/mediawiki/core/+/55d3efdb7ced2db49f7ade2aafa1ff9516e14128/tests/selenium/specs/page.js)), not Wikibase tests.