vm/dart/isolates/fast_object_copy_timeline_test flaky turned RuntimeError on vm-aot-ubsan-win-release-x64

[aam]

https://ci.chromium.org/ui/p/dart/builders/ci.sandbox/vm-ubsan-win-release-x64/218/overview

--- Command "vm_compile_to_kernel" (took 05.000160s):
set DART_CONFIGURATION=ReleaseUBSANX64 & set DART_SUPPRESS_WER=1 & set DART_CRASHPAD_HANDLER=C:\b\s\w\ir\out\ReleaseUBSANX64\crashpad_handler.exe & C:\b\s\w\ir\pkg\vm\tool\gen_kernel.bat --aot --platform=out/ReleaseUBSANX64/vm_platform.dill -o C:\b\s\w\ir\out\ReleaseUBSANX64\generated_compilations\vm-aot-ubsan-win-release-x64\short136_fast_object_copy_timeline_test\out.dill C:\b\s\w\ir\runtime\tests\vm\dart\isolates\fast_object_copy_timeline_test.dart -Dtest_runner.configuration=vm-aot-ubsan-win-release-x64 --packages=C:\b\s\w\ir\.dart_tool\package_config.json -Ddart.vm.product=false -Ddart.vm.asan=false -Ddart.vm.msan=false -Ddart.vm.tsan=false

exit code:
0

--- Command "precompiler" (took 03.000902s):
set DART_CONFIGURATION=ReleaseUBSANX64 & set DART_SUPPRESS_WER=1 & set DART_CRASHPAD_HANDLER=C:\b\s\w\ir\out\ReleaseUBSANX64\crashpad_handler.exe & out\ReleaseUBSANX64\gen_snapshot --snapshot-kind=app-aot-elf --elf=C:\b\s\w\ir\out\ReleaseUBSANX64\generated_compilations\vm-aot-ubsan-win-release-x64\short136_fast_object_copy_timeline_test\libout.so --loading-unit-manifest=C:/b/s/w/ir/out/ReleaseUBSANX64/generated_compilations/vm-aot-ubsan-win-release-x64/short136_fast_object_copy_timeline_test/ignored.json --no-enable-fast-object-copy -Dtest_runner.configuration=vm-aot-ubsan-win-release-x64 --ignore-unrecognized-flags --packages=C:\b\s\w\ir\.dart_tool\package_config.json C:\b\s\w\ir\out\ReleaseUBSANX64\generated_compilations\vm-aot-ubsan-win-release-x64\short136_fast_object_copy_timeline_test\out.dill

exit code:
0

--- Command "remove_kernel_file" (took 58ms):
set DART_CONFIGURATION=ReleaseUBSANX64 & set DART_SUPPRESS_WER=1 & set DART_CRASHPAD_HANDLER=C:\b\s\w\ir\out\ReleaseUBSANX64\crashpad_handler.exe & cmd.exe /c del C:\b\s\w\ir\out\ReleaseUBSANX64\generated_compilations\vm-aot-ubsan-win-release-x64\short136_fast_object_copy_timeline_test\out.dill

exit code:
0

--- Command "vm" (took 171ms):
set DART_CONFIGURATION=ReleaseUBSANX64 & set DART_SUPPRESS_WER=1 & set DART_CRASHPAD_HANDLER=C:\b\s\w\ir\out\ReleaseUBSANX64\crashpad_handler.exe & set TEST_COMPILATION_DIR=C:/b/s/w/ir/out/ReleaseUBSANX64/generated_compilations/vm-aot-ubsan-win-release-x64/short136_fast_object_copy_timeline_test & out\ReleaseUBSANX64\dartaotruntime.exe --no-enable-fast-object-copy -Dtest_runner.configuration=vm-aot-ubsan-win-release-x64 --ignore-unrecognized-flags --packages=C:\b\s\w\ir\.dart_tool\package_config.json C:\b\s\w\ir\out\ReleaseUBSANX64\generated_compilations\vm-aot-ubsan-win-release-x64\short136_fast_object_copy_timeline_test\libout.so

exit code:
255

stdout:
Created new block 00000195E37EF690

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

Using the File timeline recorder.

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

StartEvent in block 00000195E37EF690 for thread 8408

Created new block 00000195E5C78D60

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

StartEvent in block 00000195E5C78D60 for thread 1684

Created new block 00000195E5CC9740

StartEvent in block 00000195E5CC9740 for thread 3880

StartEvent in block 00000195E5CC9740 for thread 3880

StartEvent in block 00000195E5CC9740 for thread 3880

StartEvent in block 00000195E5CC9740 for thread 3880

StartEvent in block 00000195E5CC9740 for thread 3880

StartEvent in block 00000195E5CC9740 for thread 3880

StartEvent in block 00000195E5CC9740 for thread 3880

StartEvent in block 00000195E5CC9740 for thread 3880

StartEvent in block 00000195E5CC9740 for thread 3880

StartEvent in block 00000195E5CC9740 for thread 3880

StartEvent in block 00000195E5CC9740 for thread 3880

StartEvent in block 00000195E5CC9740 for thread 3880

StartEvent in block 00000195E5CC9740 for thread 3880

StartEvent in block 00000195E5CC9740 for thread 3880

StartEvent in block 00000195E5CC9740 for thread 3880

Created new block 00000195E5CCD390

StartEvent in block 00000195E5CCD390 for thread 8588

StartEvent in block 00000195E5CCD390 for thread 8588

Finish block 00000195E5CC9740

StartEvent in block 00000195E5CCD390 for thread 8588

StartEvent in block 00000195E5CCD390 for thread 8588

StartEvent in block 00000195E5CCD390 for thread 8588

Finish block 00000195E5CCD390

Finish block 00000195E5C78D60

Finish block 00000195E37EF690

stderr:
Unhandled exception:
Expect.equals(expected: <1>, actual: <3>) fails.
#0      Expect._fail (package:expect/expect.dart:891)
#1      Expect._failNotEqual (package:expect/expect.dart:174)
#2      Expect.equals (package:expect/expect.dart:157)
#3      main (file:///C:/b/s/w/ir/runtime/tests/vm/dart/isolates/fast_object_copy_timeline_test.dart:70)
<asynchronous suspension>

--- Re-run this test:
python3 tools/test.py -n vm-aot-ubsan-win-release-x64 vm/dart/isolates/fast_object_copy_timeline_test/0