[Gecko Bug 2065425] Don't stretch with indefinite block-size in GenerateFlexItemsForChild. - #62145

[taskcluster 2026-08-22 05:56:21.493Z] Task ID: Gb36VKFkQB-IstsufyKpxw
[taskcluster 2026-08-22 05:56:21.493Z] Worker ID: 8233511077491854729
[taskcluster 2026-08-22 05:56:21.493Z] Worker Group: us-east1-c
[taskcluster 2026-08-22 05:56:21.493Z] Worker Node Type: projects/757942385826/machineTypes/n2-standard-4
[taskcluster 2026-08-22 05:56:21.493Z] Worker Pool: proj-wpt/ci
[taskcluster 2026-08-22 05:56:21.493Z] Worker Version: 46.1.0
[taskcluster 2026-08-22 05:56:21.493Z] Public IP: 35.185.72.170
[taskcluster 2026-08-22 05:56:21.493Z] Hostname: proj-wpt-ci-ajgbby5trsuld-utwn61gg

[taskcluster 2026-08-22 05:56:22.560Z] === Task Starting ===
+ '[' '' ']'
+ '[' -d /etc/profile.d ']'
+ for i in /etc/profile.d/*.sh
+ '[' -r /etc/profile.d/01-locale-fix.sh ']'
+ . /etc/profile.d/01-locale-fix.sh
+++ /usr/bin/locale-check C.UTF-8
++ eval
+ for i in /etc/profile.d/*.sh
+ '[' -r /etc/profile.d/apps-bin-path.sh ']'
+ . /etc/profile.d/apps-bin-path.sh

...(267 lines hidden)...

Failed to read: session.screen0.maxDisableMove
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Failed to read: session.screen0.iconbar.alignment
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Failed to read: session.screen0.iconbar.iconWidth
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Failed to read: session.screen0.iconbar.iconTextPadding
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Failed to read: session.screen0.iconbar.usePixmap
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mem avail: 14671 of 15806 MiB (92.82%), swap free:    0 of    0 MiB ( 0.00%)
 1:00.07 INFO Identified 1 affected tests
 1:00.07 INFO Using certutil /usr/bin/certutil
 1:00.07 INFO Downloading geckodriver
 1:00.07 INFO Attempting to install webdriver from nightly
 1:00.34 INFO Extracted geckodriver to /home/test/web-platform-tests/_venv3/bin/geckodriver
 1:00.35 INFO Installed b'geckodriver 0.37.1 (75b411853549 2026-08-18 09:18 +0000)'
 1:00.73 INFO Getting profile data from git ref 22598deb7560ad7baef8c8f5082dcfc1e92efd54
 1:00.93 INFO Test prefs downloaded to /home/test/web-platform-tests/_venv3/profiles/22598deb7560ad7baef8c8f5082dcfc1e92efd54/156.0a1
 1:00.93 INFO Downloading OpenH264 plugin
 1:01.25 INFO Downloading openh264.json from git ref 22598deb7560ad7baef8c8f5082dcfc1e92efd54
 1:01.29 INFO Downloading OpenH264 plugin from https://ciscobinary.openh264.org/openh264-linux64-652bdb7719f30b52b08e506645a7322ff1b2cc6f.zip
 1:01.54 INFO OpenH264 plugin installed to /home/test/web-platform-tests/_venv3/browsers/nightly/gmp-gmpopenh264/2.6.0
 1:01.54 INFO Using OpenH264 plugin in /home/test/web-platform-tests/_venv3/browsers/nightly/gmp-gmpopenh264/2.6.0
[1947] Sandbox: CanCreateUserNamespace() clone() failure: EPERM
 1:01.62 mozversion INFO application_buildid: 20260821213723
 1:01.62 mozversion INFO application_changeset: ebbc8065667b64de4786095ba78e58da9d2a4a60
 1:01.62 mozversion INFO application_display_name: Firefox Nightly
 1:01.62 mozversion INFO application_id: {ec8030f7-c20a-464f-9b0e-13a3a9e97384}
 1:01.62 mozversion INFO application_name: Firefox
 1:01.62 mozversion INFO application_remotingname: firefox-nightly
 1:01.62 mozversion INFO application_repository: https://hg.mozilla.org/mozilla-central
 1:01.62 mozversion INFO application_vendor: Mozilla
 1:01.62 mozversion INFO application_version: 156.0a1
 1:01.62 mozversion INFO platform_buildid: 20260821213723
 1:01.62 mozversion INFO platform_changeset: ebbc8065667b64de4786095ba78e58da9d2a4a60
 1:01.62 mozversion INFO platform_repository: https://hg.mozilla.org/mozilla-central
 1:01.62 mozversion INFO platform_version: 156.0a1
 1:13.17 INFO Installed font: Ahem.ttf
 1:14.27 wptserve INFO Starting http server on http://127.0.0.1:8000
 1:14.30 wptserve INFO Starting http server on http://127.0.0.1:8002
 1:14.32 wptserve INFO Starting https server on https://127.0.0.1:8446
 1:14.34 wptserve INFO Starting http server on http://127.0.0.1:8001
 1:14.35 wptserve INFO Starting http server on http://127.0.0.1:8003
 1:14.38 wptserve INFO Starting https server on https://127.0.0.1:8443
 1:14.38 wptserve INFO Starting https server on https://127.0.0.1:8444
 1:14.38 wptserve INFO Starting http2 server on https://127.0.0.1:9000
 1:14.40 wptserve INFO Starting https server on https://127.0.0.1:8445
 1:14.41 wptserve INFO Create socket on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 1:14.41 wptserve INFO Bind on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 1:14.41 wptserve INFO Listen on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 1:14.42 wptserve INFO Create socket on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 1:14.42 wptserve INFO Bind on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 1:14.42 wptserve INFO Listen on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 1:14.50 wptserve INFO Starting WebTransport over HTTP/3 server on 127.0.0.1:11000
 1:15.48 SUITE_START: web-platform-test - running 1 tests
 1:32.92 INFO Using 1 child processes
 1:32.94 INFO Setting up ssl
 1:32.97 certutil Full command: /usr/bin/certutil -N -d /tmp/tmp2x7dwuxq.mozrunner -f /tmp/tmp2x7dwuxq.mozrunner/.crtdbpw
certutil b''
 1:32.99 certutil b''
 1:33.00 certutil b'\nCertificate Nickname                                         Trust Attributes\n                                                             SSL,S/MIME,JAR/XPI\n\nweb-platform-tests                                           CT,, \n'
 1:33.00 INFO Application command: /home/test/build/firefox/firefox --marionette --remote-allow-system-access about:blank -profile /tmp/tmpcvwvtey1
 1:33.02 INFO Starting runner
 1:33.02 pid:2051 Full command: /home/test/build/firefox/firefox --marionette --remote-allow-system-access about:blank
pid:2051 [2051] Sandbox: CanCreateUserNamespace() clone() failure: EPERM
 1:33.68 pid:2051 1787378474977	Marionette	INFO	Marionette enabled
 1:33.79 pid:2051 1787378475086	Marionette	INFO	Listening on port 56045
Failed to read: session.screen0.titlebar.left
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Failed to read: session.screen0.titlebar.right
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 1:36.78 pid:2051 console.error: services.settings:
 1:36.78 pid:2051   Message: EmptyDatabaseError: "main/nimbus-desktop-experiments" has not been synced yet
 1:36.78 pid:2051   Stack:
 1:36.78 pid:2051     EmptyDatabaseError@resource://services-settings/Database.sys.mjs:19:5
 1:36.78 pid:2051 list@resource://services-settings/Database.sys.mjs:96:13
 1:37.40 TEST_START: /css/css-flexbox/flex-basis-014.html
 1:37.95 TEST_END: Test OK. Subtests passed 9/9. Unexpected 0
 1:37.95 INFO No more tests
 1:37.96 pid:2051 1787378479254	Marionette	INFO	Stopped listening on port 56045
 1:38.60 INFO Browser exited with return code 0
 1:38.38 INFO Closing logging queue
 1:38.38 INFO queue closed
 1:38.61 SUITE_END

web-platform-test
~~~~~~~~~~~~~~~~~
Ran 10 checks (9 subtests, 1 tests)
Expected results: 10
Unexpected results: 0
OK
 1:38.61 INFO Got 0 unexpected results, with 0 unexpected passes
 1:38.61 wptserve INFO Stopped http server on 127.0.0.1:8000
 1:38.61 wptserve INFO Stopped http server on 127.0.0.1:8001
 1:38.62 wptserve INFO Stopped http server on 127.0.0.1:8445
 1:38.62 wptserve INFO Stopped http server on 127.0.0.1:8002
 1:38.62 wptserve INFO Stopped http server on 127.0.0.1:8446
 1:38.63 wptserve INFO Stopped http server on 127.0.0.1:8444
 1:38.63 wptserve INFO Stopped http server on 127.0.0.1:8443
 1:38.63 wptserve INFO Stopped http server on 127.0.0.1:8003
 1:38.64 wptserve INFO Stopped http server on 127.0.0.1:9000
 1:38.64 wptserve INFO Stopped WebTransport over HTTP/3 server on 127.0.0.1:11000
 1:39.00 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 1:39.00 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 1:39.05 INFO Removed font: Ahem.ttf
 1:39.08 INFO Closing logging queue
 1:39.08 INFO queue closed
[taskcluster 2026-08-22 06:01:23.743Z] === Task Finished ===
[taskcluster 2026-08-22 06:01:24.802Z] Successful task run with exit code: 0 completed in 303.309 seconds