Mac Unopt is 6% flaky on step test: Host Tests for host_debug_unopt #106588
Description
There are 6 post-submit flakes in recent 100 runs.
Example flaky builds:
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20Unopt/6173/overview
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20Unopt/6165/overview
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20Unopt/6161/overview
Error logs:
[356/360] HashCombineTest.CanHash (41 ms)
[357/360] StringRangeSanitizationTest.HandlesInvalidRanges (43 ms)
[358/360] StringRangeSanitizationTest.HandlesInvalidRanges (38 ms)
[359/360] AutoResetWaitableEventTest.MultipleWaiters (4233 ms)
[360/360] AutoResetWaitableEventTest.MultipleWaiters (4400 ms)
FAILED TESTS (1/360):
100 ms: /opt/s/w/ir/cache/builder/src/out/host_debug_unopt/fml_unittests TaskRunnerCheckerTests.FailsTheCheckIfOnDifferentTaskRunner (try #1)
SUMMARY:
/opt/s/w/ir/cache/builder/src/out/host_debug_unopt/fml_unittests TaskRunnerCheckerTests.FailsTheCheckIfOnDifferentTaskRunner passed 1 / 2 times.
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Failed Command:
python3 /opt/s/w/ir/cache/builder/src/third_party/gtest-parallel/gtest-parallel /opt/s/w/ir/cache/builder/src/out/host_debug_unopt/fml_unittests --gtest_filter=-*TimeSensitiveTest* --repeat=2
Exit Code: 245
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Traceback (most recent call last):
File "/opt/s/w/ir/cache/builder/src/flutter/testing/run_tests.py", line 1071, in <module>
sys.exit(main())
File "/opt/s/w/ir/cache/builder/src/flutter/testing/run_tests.py", line 1021, in main
build_dir, engine_filter, args.coverage, args.engine_capture_core_dump
File "/opt/s/w/ir/cache/builder/src/flutter/testing/run_tests.py", line 397, in RunCCTests
gtest=True
File "/opt/s/w/ir/cache/builder/src/flutter/testing/run_tests.py", line 225, in RunEngineExecutable
env=env
File "/opt/s/w/ir/cache/builder/src/flutter/testing/run_tests.py", line 80, in RunCmd
(command_string, process.returncode)
Exception: Command "python3 /opt/s/w/ir/cache/builder/src/third_party/gtest-parallel/gtest-parallel /opt/s/w/ir/cache/builder/src/out/host_debug_unopt/fml_unittests --gtest_filter=-*TimeSensitiveTest* --repeat=2" exited with code 245.