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Mixing an nidmm PXI-407x session and niswitch sessions causes unexpected failures finding the NI-SWITCH Functions on Linux

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Évaluation

Difficulté
4/5
Temps estimé
3-5 jours
Accessibilité débutants
30/100
Type d'issue
Bug
Clarté
Plutôt claire
Activité
À l'abandon
Stack technique
python
Domaine
backend

Piste de recherche

Commencez par la séquence reproduite dans l’issue avec Python 3.9/Linux, puis examinez niswitch/_library.py, niswitch/_library_interpreter.py et le chemin d’initialisation de la session affiché dans le traceback. Comparez l’effet du chargement de NI-DMM ou de NI-CPower avant NI-SWITCH sur la recherche de symboles. Le travail est terminé lorsque le reproducteur peut ouvrir les deux sessions simulées après dmm_session.initiate() sans le DriverTooOldError trompeur.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Description

Description of issue

Using Python 3.9.15, NI-DMM 23.5 and the nidmm 1.4.5 python package, I get weird behavior when using a 407x device and mixing usage of NI-DMM and NI-SWITCH sessions (used the niswitch 1.4.5 package, but I also reproduced with the nidcpower 1.4.5 package).

Specifically after running a very small program (listed below in the steps to reproduce) that includes opening an NI-DMM session, calling dmm.initiate(), and then opening an NI-SWITCH Session, I get the following error:

Traceback (most recent call last):
  File "/home/user/.pyenv/versions/3.9.15/lib/python3.9/site-packages/niswitch/_library.py", line 65, in _get_library_function
    function = getattr(self._library, name)
  File "/home/user/.pyenv/versions/3.9.15/lib/python3.9/ctypes/__init__.py", line 387, in __getattr__
    func = self.__getitem__(name)
  File "/home/user/.pyenv/versions/3.9.15/lib/python3.9/ctypes/__init__.py", line 392, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: /home/user/.pyenv/versions/3.9.15/bin/python: undefined symbol: niSwitch_InitWithTopology

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/user/./switch_reproducer.py", line 6, in <module>
    with niswitch.Session(resource_name="", topology="2535/1-Wire 4x136 Matrix", simulate=True) as session1:
  File "/home/user/.pyenv/versions/3.9.15/lib/python3.9/site-packages/niswitch/session.py", line 1377, in __init__
    self._interpreter.set_session_handle(self._init_with_topology(resource_name, topology, simulate, reset_device))
  File "/home/user/.pyenv/versions/3.9.15/lib/python3.9/site-packages/niswitch/session.py", line 1993, in _init_with_topology
    vi = self._interpreter.init_with_topology(resource_name, topology, simulate, reset_device)
  File "/home/user/.pyenv/versions/3.9.15/lib/python3.9/site-packages/niswitch/_library_interpreter.py", line 293, in init_with_topology
    error_code = self._library.niSwitch_InitWithTopology(resource_name_ctype, topology_ctype, simulate_ctype, reset_device_ctype, None if vi_ctype is None else (ctypes.pointer(vi_ctype)))
  File "/home/user/.pyenv/versions/3.9.15/lib/python3.9/site-packages/niswitch/_library.py", line 225, in niSwitch_InitWithTopology
    self.niSwitch_InitWithTopology_cfunc = self._get_library_function('niSwitch_InitWithTopology')
  File "/home/user/.pyenv/versions/3.9.15/lib/python3.9/site-packages/niswitch/_library.py", line 67, in _get_library_function
    raise errors.DriverTooOldError() from e
niswitch.errors.DriverTooOldError: A function was not found in the NI-SWITCH runtime. Please visit http://www.ni.com/downloads/drivers/ to download a newer version and install it.

The error is clearly misleading. I shouldn't have any issues opening a session to both devices.

I am using IVI simulated devices, so no hardware is required.
If I simulate a 4081 DMM instead of a 4071, the error doesn't happen.
If I remove the dmm.initiate() call then the error doesn't happen.
If I use Python 3.10.8 then even the reproducing example as written doesn't reproduce.
I have also rewritten the example using a simulated nidcpower.Session (using a 4190), and that DOES reproduce (so I think that nidmm must be at fault).

I have found that this is very particular, and if I modify the code slightly I can stop seeing the error (move the dmm.initiate() after opening the niswitch.Session and its fine).

System report

python -c "import nidmm; nidmm.print_diagnostic_information()" output:

OS:
    Name:      Linux
    Version:   #26~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Jul 13 16:27:29 UTC 2
    Bits:      64
Driver:
    Name:      NI-DMM
    Version:   Unknown
Module:
    Name:      nidmm
    Version:   1.4.5
Python:
    Version:   3.9.15 (main, Aug 11 2023, 09:46:20)
[GCC 11.4.0]
    Bits:      64
    Is_Venv:   False
    Installed Packages:
        virtualenv==20.24.2
        setuptools==58.1.0
        platformdirs==3.10.0
        pip==22.0.4
        niswitch==1.4.5
        nidmm==1.4.5
        nidcpower==1.4.5
        hightime==0.2.1
        filelock==3.12.2
        distlib==0.3.7
Steps to reproduce issue
import niswitch
import nidmm

with nidmm.Session(resource_name="", options= { "simulate": True, "driver_setup": { "Model": "4071" } }) as dmm_session:
    dmm_session.initiate()
    with niswitch.Session(resource_name="", topology="2535/1-Wire 4x136 Matrix", simulate=True) as session1:
        pass

Run the above code using python 3.9.15 on Linux

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