Bug#1098962: python3-torch-cuda undefined symbol: nvtxRangePop

["M. Zhou" <lumin@debian.org>]

Package: python3-torch-cuda
Version: 2.6.0+dfsg-3
Severity: serious

In [1]: import torch
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
Cell In[1], line 1
----> 1 import torch

File /usr/lib/python3/dist-packages/torch/__init__.py:405
    403     if USE_GLOBAL_DEPS:
    404         _load_global_deps()
--> 405     from torch._C import *  # noqa: F403
    408 class SymInt:
    409     """
    410     Like an int (including magic methods), but redirects all operations on the
    411     wrapped node. This is used in particular to symbolically record operations
    412     in the symbolic shape workflow.
    413     """

ImportError: /lib/x86_64-linux-gnu/libtorch_cuda.so.2.6: undefined symbol: nvtxRangePop

In [2]: 


The temporary workaround is to preload the shared object 
export LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libnvToolsExt.so.1
Then it works normally. Maybe we missed this shared object during linking.