#19121 Getting UnicodeDecodeError from stdout.decode when xdist is disabled Issue created by TalAmuyal When setting

[pytest].xdist_enabled = false

in

pants.toml

, I get:

15:53:04.53 [ERROR] 1 Exception encountered:

Engine traceback:
  in select
    ..
  in pants.core.goals.test.run_tests
    `test` goal

Traceback (most recent call last):
  File "/opt/pantsbuild/.cache/nce/ae553d873185fa750061b1a3d4226442fb99fb55d4403b0227ec972406554da3/bindings/venvs/2.16.0rc1/lib/python3.9/site-packages/pants/engine/internals/selectors.py", line 623, in native_engine_generator_send
    res = rule.send(arg) if err is None else rule.throw(throw or err)
  File "/opt/pantsbuild/.cache/nce/ae553d873185fa750061b1a3d4226442fb99fb55d4403b0227ec972406554da3/bindings/venvs/2.16.0rc1/lib/python3.9/site-packages/pants/core/goals/test.py", line 832, in run_tests
    results = await MultiGet(
  File "/opt/pantsbuild/.cache/nce/ae553d873185fa750061b1a3d4226442fb99fb55d4403b0227ec972406554da3/bindings/venvs/2.16.0rc1/lib/python3.9/site-packages/pants/engine/internals/selectors.py", line 358, in MultiGet
    return await _MultiGet(tuple(__arg0))
  File "/opt/pantsbuild/.cache/nce/ae553d873185fa750061b1a3d4226442fb99fb55d4403b0227ec972406554da3/bindings/venvs/2.16.0rc1/lib/python3.9/site-packages/pants/engine/internals/selectors.py", line 165, in __await__
    result = yield self.gets
  File "/opt/pantsbuild/.cache/nce/ae553d873185fa750061b1a3d4226442fb99fb55d4403b0227ec972406554da3/bindings/venvs/2.16.0rc1/lib/python3.9/site-packages/pants/engine/internals/selectors.py", line 623, in native_engine_generator_send
    res = rule.send(arg) if err is None else rule.throw(throw or err)
  File "/opt/pantsbuild/.cache/nce/ae553d873185fa750061b1a3d4226442fb99fb55d4403b0227ec972406554da3/bindings/venvs/2.16.0rc1/lib/python3.9/site-packages/pants/backend/python/goals/pytest_runner.py", line 507, in run_python_tests
    return TestResult.from_batched_fallible_process_result(
  File "/opt/pantsbuild/.cache/nce/ae553d873185fa750061b1a3d4226442fb99fb55d4403b0227ec972406554da3/bindings/venvs/2.16.0rc1/lib/python3.9/site-packages/pants/core/goals/test.py", line 172, in from_batched_fallible_process_result
    stdout=process_result.stdout.decode(),
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x84 in position 1437: invalid start byte

Pants version Tried with both 2.16.0rc1 and 2.16.0rc3. OS Linux. Additional info @tdyas suggested in Slack that we shouldn't assume

ProcessResult.stdout

is in any particular format. Slack thread: link. pantsbuild/pants