docs/source/optimizations/qscout/qscout_css.ipynb notebook test flakes

[natibek]

What is happening?

Workflow test failure for notebook docs/source/optimizations/qscout/qscout_css.ipynb with error ERROR traitlets:client.py:567 Error occurred while starting new kernel client for kernel 88152613-62e1-40f8-8d8d-f2590156b679: Kernel died before replying to kernel_info.

Notebook check for cirq-superstaq

Notebook check for cirq-superstaq failure

============================= test session starts ==============================
platform linux -- Python 3.13.0, pytest-8.3.3, pluggy-1.5.0 -- /opt/hostedtoolcache/Python/3.13.0/x64/bin/python
cachedir: .pytest_cache
Using --randomly-seed=2837684675
rootdir: /home/runner/work/client-superstaq/client-superstaq
configfile: pyproject.toml
plugins: randomly-3.16.0, anyio-4.6.2.post1, nbmake-1.5.4, cov-6.0.0, socket-0.7.0, xdist-3.6.1
created: 9/9 workers
9 workers [9 items]

scheduling tests via LoadScheduling

docs/source/optimizations/aqt/aqt_css.ipynb:: 
docs/source/get_started/access_info/access_info_css.ipynb:: 
cirq-superstaq/docs/getting_started_cirq_superstaq.ipynb:: 
docs/source/optimizations/sqorpius/sqorpius_compile_css.ipynb:: 
docs/source/optimizations/ibm/ibmq_compile_css.ipynb:: 
docs/source/get_started/basics/basics_css.ipynb:: 
cirq-superstaq/examples/resource_estimate.ipynb:: 
cirq-superstaq/docs/ibm_cirq_superstaq.ipynb:: 
docs/source/optimizations/qscout/qscout_css.ipynb:: 
[gw8] [ 11%] FAILED docs/source/optimizations/qscout/qscout_css.ipynb:: 
[gw2] [ 22%] PASSED cirq-superstaq/docs/ibm_cirq_superstaq.ipynb:: 
[gw1] [ 33%] PASSED cirq-superstaq/docs/getting_started_cirq_superstaq.ipynb:: 
[gw3] [ 44%] PASSED docs/source/get_started/basics/basics_css.ipynb:: 
[gw5] [ 55%] PASSED docs/source/optimizations/ibm/ibmq_compile_css.ipynb:: 
[gw0] [ 66%] PASSED cirq-superstaq/examples/resource_estimate.ipynb:: 
[gw7] [ 77%] PASSED docs/source/get_started/access_info/access_info_css.ipynb:: 
[gw4] [ 88%] PASSED docs/source/optimizations/sqorpius/sqorpius_compile_css.ipynb:: 
Exception ignored in atexit callback <bound method run_sync.<locals>.wrapped of <nbclient.client.NotebookClient object at 0x7f4c901baf90>>:
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/nbclient/util.py", line 85, in wrapped
    return just_run(coro(*args, **kwargs))
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/nbclient/util.py", line 60, in just_run
    return loop.run_until_complete(coro)
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/asyncio/base_events.py", line 721, in run_until_complete
    return future.result()
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/nbclient/client.py", line 503, in _async_cleanup_kernel
    assert self.km is not None
AssertionError: 
[gw6] [100%] PASSED docs/source/optimizations/aqt/aqt_css.ipynb:: 

=================================== FAILURES ===================================
_ /home/runner/work/client-superstaq/client-superstaq/docs/source/optimizations/qscout/qscout_css.ipynb _
[gw8] linux -- Python 3.13.0 /opt/hostedtoolcache/Python/3.13.0/x64/bin/python
NBMAKE INTERNAL ERROR
Kernel died before replying to kernel_info
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/_pytest/runner.py", line 341, in from_call
    result: TResult | None = func()
                             ~~~~^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/_pytest/runner.py", line 242, in <lambda>
    lambda: runtest_hook(item=item, **kwds), when=when, reraise=reraise
            ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/pluggy/_hooks.py", line 513, in __call__
    return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
           ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/pluggy/_manager.py", line 120, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
           ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/pluggy/_callers.py", line 139, in _multicall
    raise exception.with_traceback(exception.__traceback__)
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/pluggy/_callers.py", line 122, in _multicall
    teardown.throw(exception)  # type: ignore[union-attr]
    ~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/_pytest/threadexception.py", line 92, in pytest_runtest_call
    yield from thread_exception_runtest_hook()
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/_pytest/threadexception.py", line 68, in thread_exception_runtest_hook
    yield
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/pluggy/_callers.py", line 122, in _multicall
    teardown.throw(exception)  # type: ignore[union-attr]
    ~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/_pytest/unraisableexception.py", line 95, in pytest_runtest_call
    yield from unraisable_exception_runtest_hook()
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/_pytest/unraisableexception.py", line 70, in unraisable_exception_runtest_hook
    yield
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/pluggy/_callers.py", line 122, in _multicall
    teardown.throw(exception)  # type: ignore[union-attr]
    ~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/_pytest/logging.py", line 846, in pytest_runtest_call
    yield from self._runtest_for(item, "call")
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/_pytest/logging.py", line 829, in _runtest_for
    yield
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/pluggy/_callers.py", line 122, in _multicall
    teardown.throw(exception)  # type: ignore[union-attr]
    ~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/_pytest/capture.py", line 880, in pytest_runtest_call
    return (yield)
            ^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/pluggy/_callers.py", line 122, in _multicall
    teardown.throw(exception)  # type: ignore[union-attr]
    ~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/_pytest/skipping.py", line 257, in pytest_runtest_call
    return (yield)
            ^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/pluggy/_callers.py", line 103, in _multicall
    res = hook_impl.function(*args)
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/_pytest/runner.py", line 174, in pytest_runtest_call
    item.runtest()
    ~~~~~~~~~~~~^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/nbmake/pytest_items.py", line 54, in runtest
    res: NotebookResult = run.execute()
                          ~~~~~~~~~~~^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/nbmake/nb_run.py", line 131, in execute
    raise err
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/nbmake/nb_run.py", line 113, in execute
    c.execute(cwd=self.filename.parent)
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/nbclient/util.py", line 85, in wrapped
    return just_run(coro(*args, **kwargs))
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/nbclient/util.py", line 60, in just_run
    return loop.run_until_complete(coro)
           ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/asyncio/base_events.py", line 721, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/nbclient/client.py", line 691, in async_execute
    async with self.async_setup_kernel(**kwargs):
               ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/contextlib.py", line 214, in __aenter__
    return await anext(self.gen)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/nbclient/client.py", line 649, in async_setup_kernel
    await self.async_start_new_kernel_client()
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/nbclient/client.py", line 565, in async_start_new_kernel_client
    await ensure_async(self.kc.wait_for_ready(timeout=self.startup_timeout))  # type:ignore
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/nbclient/util.py", line 97, in ensure_async
    result = await obj
             ^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/jupyter_client/client.py", line 203, in _async_wait_for_ready
    raise RuntimeError(msg)
----------------------------- Captured stderr call -----------------------------
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/ipykernel_launcher.py", line 18, in <module>
    app.launch_new_instance()
    ~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/traitlets/config/application.py", line 1074, in launch_instance
    app.initialize(argv)
    ~~~~~~~~~~~~~~^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/traitlets/config/application.py", line 118, in inner
    return method(app, *args, **kwargs)
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/ipykernel/kernelapp.py", line 692, in initialize
    self.init_sockets()
    ~~~~~~~~~~~~~~~~~^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/ipykernel/kernelapp.py", line 331, in init_sockets
    self.shell_port = self._bind_socket(self.shell_socket, self.shell_port)
                      ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/ipykernel/kernelapp.py", line 253, in _bind_socket
    return self._try_bind_socket(s, port)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/ipykernel/kernelapp.py", line 229, in _try_bind_socket
    s.bind("tcp://%s:%i" % (self.ip, port))
    ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.0/x64/lib/python3.13/site-packages/zmq/sugar/socket.py", line 311, in bind
    super().bind(addr)
    ~~~~~~~~~~~~^^^^^^
  File "_zmq.py", line 917, in zmq.backend.cython._zmq.Socket.bind
  File "_zmq.py", line 179, in zmq.backend.cython._zmq._check_rc
zmq.error.ZMQError: Address already in use (addr='tcp://127.0.0.1:[58](https://github.com/Infleqtion/client-superstaq/actions/runs/11825920687/job/32950782014#step:5:59)255')
------------------------------ Captured log call -------------------------------
ERROR    traitlets:client.py:567 Error occurred while starting new kernel client for kernel 88152613-62e1-40f8-8d8d-f2[59](https://github.com/Infleqtion/client-superstaq/actions/runs/11825920687/job/32950782014#step:5:60)0156b679: Kernel died before replying to kernel_info

* nbmake: Automate reading GitHub Actions logs with our bot: https://github.com/marketplace/treebeard-build

=========================== short test summary info ============================
FAILED docs/source/optimizations/qscout/qscout_css.ipynb::
=================== 1 failed, 8 passed in 135.03s (0:02:15) ====================

How can we reproduce the issue?

It fails randomly when testing with Github actions.

What should happen?

PRs where it fails do not include changes to the file. It should not be failing.

Environment

• Superstaq version: 0.5.39
• general-superstaq version: 0.5.31
• cirq-superstaq version: 0.5.31
• qiskit-superstaq version: 0.5.31
• Operating system: Ubuntu 22.04.5 LTS
• Python version:: Python 3.13

Any additional context?

No response

[bharat-thotakura]

Another recent occurrence back to back: https://github.com/Infleqtion/client-superstaq/actions/runs/11845243213/job/33010280594?pr=1102 & https://github.com/Infleqtion/client-superstaq/actions/runs/11845243213/job/33010860701?pr=1102