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

[taskcluster 2026-08-22 05:36:52.541Z] Task ID: U1kHe2LNT224oQeHzlI-YQ
[taskcluster 2026-08-22 05:36:52.541Z] Worker ID: 3478215650632355278
[taskcluster 2026-08-22 05:36:52.541Z] Worker Group: us-east1-c
[taskcluster 2026-08-22 05:36:52.541Z] Worker Node Type: projects/757942385826/machineTypes/n2-standard-4
[taskcluster 2026-08-22 05:36:52.541Z] Worker Pool: proj-wpt/ci
[taskcluster 2026-08-22 05:36:52.541Z] Worker Version: 46.1.0
[taskcluster 2026-08-22 05:36:52.541Z] Public IP: 35.231.247.214
[taskcluster 2026-08-22 05:36:52.541Z] Hostname: proj-wpt-ci-uz0hkslnsdse-s6dqgkjva

[taskcluster 2026-08-22 05:36:53.651Z] === 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

...(392 lines hidden)...

Failed to read: session.screen0.autoRaise
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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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Warning: could not load product 'firefox' for argument registration: No module named 'mozleak'
Warning: could not load product 'firefox_android' for argument registration: No module named 'mozrunner'
 0:00.00 INFO Set tests_root to /home/test/web-platform-tests
 0:00.00 INFO Set metadata_root to /home/test/web-platform-tests
 0:00.00 INFO Set manifest_update to True
 0:00.00 INFO Set manifest_download to True
 0:39.28 INFO Identified 1 affected tests
 0:39.28 INFO Installing browser
 0:39.33 INFO Downloading Chrome for Testing from https://storage.googleapis.com/chrome-for-testing-public/154.0.8013.2/linux64/chrome-linux64.zip
 0:42.93 INFO Downloading Mojo bindings from https://storage.googleapis.com/chrome-for-testing-public/154.0.8013.2/mojojs.zip
 0:42.98 INFO MojoJS enabled automatically (mojojs_path: /home/test/web-platform-tests/_venv3/mojojs/gen)
 0:43.01 INFO Download info for matching ChromeDriver version found.
 0:43.01 INFO Downloading ChromeDriver from https://storage.googleapis.com/chrome-for-testing-public/154.0.8013.2/linux64/chromedriver-linux64.zip
 0:43.28 INFO Automatically turning on experimental features
mem avail: 14461 of 15806 MiB (91.49%), swap free:    0 of    0 MiB ( 0.00%)
 0:54.37 INFO Installed font: Ahem.ttf
 0:55.52 wptserve INFO Starting http server on http://127.0.0.1:8000
 0:55.54 wptserve INFO Starting http server on http://127.0.0.1:8002
 0:55.56 wptserve INFO Starting http server on http://127.0.0.1:8001
 0:55.60 wptserve INFO Starting http server on http://127.0.0.1:8003
 0:55.60 wptserve INFO Starting https server on https://127.0.0.1:8443
 0:55.62 wptserve INFO Starting https server on https://127.0.0.1:8445
 0:55.62 wptserve INFO Starting https server on https://127.0.0.1:8446
 0:55.62 wptserve INFO Starting https server on https://127.0.0.1:8444
 0:55.65 wptserve INFO Starting http2 server on https://127.0.0.1:9000
 0:55.65 wptserve INFO Create socket on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:55.65 wptserve INFO Bind on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:55.65 wptserve INFO Listen on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:55.65 wptserve INFO Create socket on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:55.66 wptserve INFO Bind on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:55.66 wptserve INFO Listen on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:55.73 wptserve INFO Starting WebTransport over HTTP/3 server on 127.0.0.1:11000
 0:56.71 SUITE_START: web-platform-test - running 1 tests
 1:04.30 INFO Using 1 child processes
 1:04.31 INFO Starting WebDriver: /home/test/web-platform-tests/_venv3/bin/chrome/chromedriver --port=56379 --ignore-explicit-port --url-base=/ --enable-chrome-logs --disable-build-check
 1:04.33 INFO Got WebDriver port 35425
 1:04.43 pid:2843 Full command: /home/test/web-platform-tests/_venv3/bin/chrome/chromedriver --port=56379 --ignore-explicit-port --url-base=/ --enable-chrome-logs --disable-build-check
pid:2843 Starting ChromeDriver 154.0.8013.2 (cd97647436f2c251cc6cd74d9302d9ce79a7957f-refs/branch-heads/8013@{#6}) on port 0
 1:04.43 pid:2843 Only local connections are allowed.
 1:04.43 pid:2843 Please see https://chromedriver.chromium.org/security-considerations for suggestions on keeping ChromeDriver safe.
 1:04.43 pid:2843 ChromeDriver was started successfully on port 35425.
 1:04.43 INFO Webdriver started successfully.
 1:04.43 INFO Starting runner
 1:05.90 pid:2843 [2892:2892:0822/054157.546065:WARNING:media/gpu/vaapi/vaapi_wrapper.cc:1660] drmGetDevices2() has not found any devices
 1:05.91 pid:2843 [2892:2892:0822/054157.550634:WARNING:sandbox/policy/linux/sandbox_linux.cc:405] InitializeSandbox() called with multiple threads in process gpu-process.
 1:05.91 pid:2843 [2892:2892:0822/054157.554547:WARNING:ui/gfx/linux/gbm_support_x11.cc:48] dri3 extension not supported.
 1:06.07 pid:2843 [1787377317.719][WARNING]: You are using an unsupported command-line switch: --disable-build-check. Please don't report bugs that cannot be reproduced with this switch removed.
 1:06.18 pid:2843 [2959:2959:0822/054157.825142:WARNING:content/child/runtime_features.cc:523] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 1:06.19 pid:2843 Error: unrecognized flag --js-float16array
 1:06.19 pid:2843 Try --help for options
 1:06.24 pid:2843 [2860:2860:0822/054157.881580:WARNING:ui/aura/window.cc:1465] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 1:06.24 pid:2843 [2860:2860:0822/054157.881657:WARNING:ui/aura/window.cc:1465] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 1:06.24 pid:2843 [2971:2971:0822/054157.887818:WARNING:content/child/runtime_features.cc:523] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 1:06.25 pid:2843 Error: unrecognized flag --js-float16array
Failed to read: session.screen0.titlebar.left
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Failed to read: session.screen0.titlebar.right
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 1:06.25 pid:2843 Try --help for options
 1:06.29 pid:2843 [2860:2860:0822/054157.933133:ERROR:dbus/object_proxy.cc:572] Failed to call method: org.freedesktop.DBus.Properties.GetAll: object_path= /org/freedesktop/UPower/devices/DisplayDevice: org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.UPower was not provided by any .service files
 1:06.29 pid:2843 [2860:2860:0822/054157.934008:WARNING:dbus/property.cc:174] GetAll request failed for: org.freedesktop.UPower.Device
 1:06.32 pid:2843 [2860:2860:0822/054157.964034:WARNING:ui/base/idle/idle_linux.cc:111] None of the known D-Bus ScreenSaver services could be used.
 1:06.34 pid:2843 [2983:2983:0822/054157.979900:WARNING:content/child/runtime_features.cc:523] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 1:06.34 pid:2843 [2860:2860:0822/054157.989162:ERROR:dbus/object_proxy.cc:572] Failed to call method: org.freedesktop.NetworkManager.GetDevices: object_path= /org/freedesktop/NetworkManager: org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.NetworkManager was not provided by any .service files
 1:06.34 pid:2843 [2860:2860:0822/054157.989188:WARNING:services/device/geolocation/wifi_data_provider_linux.cc:171] Failed to get the device list
 1:06.35 pid:2843 Error: unrecognized flag --js-float16array
 1:06.35 pid:2843 Try --help for options
 1:06.47 pid:2843 [2998:2998:0822/054158.110105:WARNING:content/child/runtime_features.cc:523] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 1:06.48 pid:2843 Error: unrecognized flag --js-float16array
 1:06.48 pid:2843 Try --help for options
 1:06.56 TEST_START: /css/css-flexbox/flex-basis-014.html
 1:06.60 pid:2843 [3013:3013:0822/054158.241690:WARNING:content/child/runtime_features.cc:523] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 1:06.61 pid:2843 Error: unrecognized flag --js-float16array
 1:06.61 pid:2843 Try --help for options
 1:06.64 pid:2843 [2860:2860:0822/054158.289859:WARNING:ui/aura/window.cc:1465] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 1:06.64 pid:2843 [2860:2860:0822/054158.289997:WARNING:ui/aura/window.cc:1465] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 1:07.15 pid:2843 [2860:2860:0822/054158.794514:WARNING:ui/aura/window.cc:1465] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 1:07.15 pid:2843 [2860:2860:0822/054158.795112:WARNING:ui/aura/window.cc:1465] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 1:07.20 TEST_END: Test OK. Subtests passed 9/9. Unexpected 0
 1:07.20 INFO No more tests
 1:07.25 INFO Closing logging queue
 1:07.25 INFO queue closed
 1:07.32 SUITE_END

web-platform-test
~~~~~~~~~~~~~~~~~
Ran 10 checks (9 subtests, 1 tests)
Expected results: 10
Unexpected results: 0
OK
 1:07.32 INFO Got 0 unexpected results, with 0 unexpected passes
 1:07.33 wptserve INFO Stopped http server on 127.0.0.1:8000
 1:07.33 wptserve INFO Stopped http server on 127.0.0.1:8001
 1:07.33 wptserve INFO Stopped http server on 127.0.0.1:8002
 1:07.33 wptserve INFO Stopped http server on 127.0.0.1:8445
 1:07.34 wptserve INFO Stopped http server on 127.0.0.1:8003
 1:07.34 wptserve INFO Stopped http server on 127.0.0.1:8444
 1:07.34 wptserve INFO Stopped http server on 127.0.0.1:8443
 1:07.34 wptserve INFO Stopped http server on 127.0.0.1:8446
 1:07.34 wptserve INFO Stopped http server on 127.0.0.1:9000
 1:07.34 wptserve INFO Stopped WebTransport over HTTP/3 server on 127.0.0.1:11000
 1:07.72 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 1:07.72 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 1:07.78 INFO Removed font: Ahem.ttf
 1:07.81 INFO Closing logging queue
 1:07.81 INFO queue closed
[taskcluster 2026-08-22 05:42:02.698Z] === Task Finished ===
[taskcluster 2026-08-22 05:42:03.677Z] Successful task run with exit code: 0 completed in 311.137 seconds