Cannot pass object to the report (crashitem)

I have this issue only when enabling pytest-xdist (1.32.0) using the -n parameter.

After some investigation, I spot the part of our code which raise the error. In our conftest.py file we have something similar to this:

    def makereport(self, item: Function, report: TestReport) -> None:
        report.foo = {"foo": object()}

We inject additional information within the TestReport object.

Running a test with this will result in:

test_focus.py::TestFocus::test_focus[Marketplace-DISPLAY REDIRECT INTERNAL-WIDGET TOP-desktop-windows 10-chrome] 
INTERNALERROR> Traceback (most recent call last):
INTERNALERROR>   File "/home/tetienne/git/awesome_project/.venv/lib/python3.7/site-packages/_pytest/main.py", line 191, in wrap_session
INTERNALERROR>     session.exitstatus = doit(config, session) or 0
INTERNALERROR>   File "/home/tetienne/git/awesome_project/.venv/lib/python3.7/site-packages/_pytest/main.py", line 247, in _main
INTERNALERROR>     config.hook.pytest_runtestloop(session=session)
INTERNALERROR>   File "/home/tetienne/git/awesome_project/.venv/lib/python3.7/site-packages/pluggy/hooks.py", line 286, in __call__
INTERNALERROR>     return self._hookexec(self, self.get_hookimpls(), kwargs)
INTERNALERROR>   File "/home/tetienne/git/awesome_project/.venv/lib/python3.7/site-packages/pluggy/manager.py", line 93, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook, methods, kwargs)
INTERNALERROR>   File "/home/tetienne/git/awesome_project/.venv/lib/python3.7/site-packages/pluggy/manager.py", line 87, in <lambda>
INTERNALERROR>     firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
INTERNALERROR>   File "/home/tetienne/git/awesome_project/.venv/lib/python3.7/site-packages/pluggy/callers.py", line 208, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/home/tetienne/git/awesome_project/.venv/lib/python3.7/site-packages/pluggy/callers.py", line 80, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/home/tetienne/git/awesome_project/.venv/lib/python3.7/site-packages/pluggy/callers.py", line 187, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/home/tetienne/git/awesome_project/.venv/lib/python3.7/site-packages/xdist/dsession.py", line 112, in pytest_runtestloop
INTERNALERROR>     self.loop_once()
INTERNALERROR>   File "/home/tetienne/git/awesome_project/.venv/lib/python3.7/site-packages/xdist/dsession.py", line 135, in loop_once
INTERNALERROR>     call(**kwargs)
INTERNALERROR>   File "/home/tetienne/git/awesome_project/.venv/lib/python3.7/site-packages/xdist/dsession.py", line 177, in worker_workerfinished
INTERNALERROR>     assert not crashitem, (crashitem, node)
INTERNALERROR> AssertionError: ('tests/test_focus.py::TestFocus::test_focus[Marketplace-DISPLAY REDIRECT INTERNAL-WIDGET TOP-desktop-windows 10-chrome]', <WorkerController gw0>)
INTERNALERROR> assert not 'tests/test_focus.py::TestFocus::test_focus[Marketplace-DISPLAY REDIRECT INTERNAL-WIDGET TOP-desktop-windows 10-chrome]'

When passing a string, or an integer, there is no issue.

It's a known behavior?

Reproduce the conftest.py example with pytest-xdist enabled via -n, then trace how the report is transferred through xdist/dsession.py. Determine the expected handling of an object-valued TestReport attribute and add regression coverage showing that the run no longer crashes while preserving supported report data.