pause_on_unhandled_async_exceptions_zones_test now failing

[rmacnak-google]

The tests

service/pause_on_unhandled_async_exceptions_zones_test/dds RuntimeError (expected Pass)
service/pause_on_unhandled_async_exceptions_zones_test/service RuntimeError (expected Pass)

are failing on configurations

vm-aot-linux-release-x64

@bkonyi @derekxu16

[alexmarkov]

This test went from flaky to RuntimeError:

--- Command "vm_compile_to_kernel" (took 08.000745s):
DART_CONFIGURATION=DebugX64 /b/s/w/ir/pkg/vm/tool/gen_kernel --aot --platform=out/DebugX64/vm_platform_strong.dill -o /b/s/w/ir/out/DebugX64/generated_compilations/vm-aot-linux-debug-x64/runtime_observatory_tests_service_pause_on_unhandled_async_exceptions_zones_test.dart_1/out.dill /b/s/w/ir/runtime/observatory/tests/service/pause_on_unhandled_async_exceptions_zones_test.dart -DUSE_DDS=true -Dtest_runner.configuration=vm-aot-linux-debug-x64 --packages=/b/s/w/ir/.dart_tool/package_config.json -Ddart.vm.product=false --sound-null-safety

exit code:
0

--- Command "precompiler" (took 19.000977s):
DART_CONFIGURATION=DebugX64 out/DebugX64/gen_snapshot --snapshot-kind=app-aot-assembly --assembly=/b/s/w/ir/out/DebugX64/generated_compilations/vm-aot-linux-debug-x64/runtime_observatory_tests_service_pause_on_unhandled_async_exceptions_zones_test.dart_1/out.S --sound-null-safety -DUSE_DDS=true -Dtest_runner.configuration=vm-aot-linux-debug-x64 --ignore-unrecognized-flags --packages=/b/s/w/ir/.dart_tool/package_config.json /b/s/w/ir/out/DebugX64/generated_compilations/vm-aot-linux-debug-x64/runtime_observatory_tests_service_pause_on_unhandled_async_exceptions_zones_test.dart_1/out.dill

exit code:
0

--- Command "remove_kernel_file" (took 21ms):
DART_CONFIGURATION=DebugX64 rm /b/s/w/ir/out/DebugX64/generated_compilations/vm-aot-linux-debug-x64/runtime_observatory_tests_service_pause_on_unhandled_async_exceptions_zones_test.dart_1/out.dill

exit code:
0

--- Command "assemble" (took 01.000668s):
DART_CONFIGURATION=DebugX64 gcc -Wl,--no-undefined -shared -o /b/s/w/ir/out/DebugX64/generated_compilations/vm-aot-linux-debug-x64/runtime_observatory_tests_service_pause_on_unhandled_async_exceptions_zones_test.dart_1/out.aotsnapshot /b/s/w/ir/out/DebugX64/generated_compilations/vm-aot-linux-debug-x64/runtime_observatory_tests_service_pause_on_unhandled_async_exceptions_zones_test.dart_1/out.S

exit code:
0

--- Command "remove_assembly" (took 23ms):
DART_CONFIGURATION=DebugX64 rm /b/s/w/ir/out/DebugX64/generated_compilations/vm-aot-linux-debug-x64/runtime_observatory_tests_service_pause_on_unhandled_async_exceptions_zones_test.dart_1/out.S

exit code:
0

--- Command "vm" (took 203ms):
DART_CONFIGURATION=DebugX64 TEST_COMPILATION_DIR=/b/s/w/ir/out/DebugX64/generated_compilations/vm-aot-linux-debug-x64/runtime_observatory_tests_service_pause_on_unhandled_async_exceptions_zones_test.dart_1 out/DebugX64/dartaotruntime -DUSE_DDS=true --sound-null-safety -Dtest_runner.configuration=vm-aot-linux-debug-x64 --ignore-unrecognized-flags --packages=/b/s/w/ir/.dart_tool/package_config.json /b/s/w/ir/out/DebugX64/generated_compilations/vm-aot-linux-debug-x64/runtime_observatory_tests_service_pause_on_unhandled_async_exceptions_zones_test.dart_1/out.aotsnapshot

exit code:
255

stdout:
00:00 �[32m+0�[0m: out.aotsnapshot (DDS)�[0m

** Launching SERVICE_TEST_TESTEE=true out/DebugX64/dartaotruntime --disable-dart-dev --no-dds --write-service-info=file:///b/s/w/it3m_2e7ay/dart_serviceIIZHAP/service_info.json --pause-isolates-on-unhandled-exceptions --profiler -DUSE_DDS=true --sound-null-safety -Dtest_runner.configuration=vm-aot-linux-debug-x64 --ignore-unrecognized-flags --packages=/b/s/w/ir/.dart_tool/package_config.json --enable-vm-service:0 /b/s/w/ir/out/DebugX64/generated_compilations/vm-aot-linux-debug-x64/runtime_observatory_tests_service_pause_on_unhandled_async_exceptions_zones_test.dart_1/out.aotsnapshot

>testee>out> 

>testee>out> The Dart VM service is listening on http://127.0.0.1:46751/w_I3__IzscI=/

** Signaled to run test queries on http://127.0.0.1:43637/ZMRkmxeLBV0=/ (DDS)

Loading VM...

Done loading VM

00:00 �[32m+0�[0m�[31m -1�[0m: out.aotsnapshot (DDS) �[1m�[31m[E]�[0m�[0m

  Null check operator used on a null value

  package:observatory/event.dart 261                createEventFromServiceEvent
  package:observatory/src/service/object.dart 1729  Isolate._update
  package:observatory/src/service/object.dart 411   ServiceObject.updateFromServiceMap
  package:observatory/src/service/object.dart 369   ServiceObject.reload.<fn>
  dart:async/zone.dart 1538                         _rootRunUnary
  ===== asynchronous gap ===========================
  package:observatory/src/service/object.dart 376   ServiceObject.reload.<fn>
  

** Killing script

00:00 �[32m+0�[0m�[31m -1�[0m: �[31mSome tests failed.�[0m



Consider enabling the flag chain-stack-traces to receive more detailed exceptions.
For example, 'dart test --chain-stack-traces'.

stderr:
Unhandled exception:
Dummy exception to set exit code.

--- Re-run this test:
python3 tools/test.py -n vm-aot-linux-debug-x64 service/pause_on_unhandled_async_exceptions_zones_test/dds