[WinError 1114] loading c10.dll issue occurred while running import torch

Sauravroy34 · January 17, 2026, 5:13pm

HI,There
i guess this github issue should be relevant

[WinError 1114] A dynamic link library (DLL) initialization routine failed

opened 10:14AM - 30 Oct 25 UTC

module: binaries module: windows triaged

### 🐛 Describe the bug ## PyTorch fails to import after PyQt on Windows ### De…scription Importing PyTorch **after** PyQt on Windows causes a DLL initialization error. The same code works if PyTorch is imported first. This issue started occurring after upgrading from PyTorch `2.8.0` to `2.9.0`. ## Reproduction ### This code fails: ```python from PyQt6.QtWidgets import QApplication import torch ``` **Result:** ```bash Traceback (most recent call last): File ""C:\...\abogen\abogen\test.py", line 3, in <module> import torch File ""C:\...\Lib\site-packages\torch\__init__.py", line 281, in <module> _load_dll_libraries() File ""C:\...\Lib\site-packages\torch\__init__.py", line 264, in _load_dll_libraries raise err OSError: [WinError 1114] A dynamic link library (DLL) initialization routine failed. Error loading ""C:\...\Lib\site-packages\torch\lib\c10.dll" or one of its dependencies. ``` ### This code works: ```python import torch from PyQt6.QtWidgets import QApplication ``` **Result:** ``` (imports successfully, no error) ``` ### Notes - Issue started after upgrading from PyTorch `2.8.0` to `2.9.0`. - Affects Windows GUI applications using both PyTorch and PyQt > [!NOTE] > Issue is still present in PyTorch `2.9.1` ### Versions Collecting environment information... PyTorch version: 2.9.0+cpu Is debug build: False CUDA used to build PyTorch: None ROCM used to build PyTorch: N/A OS: Microsoft Windows 11 Home (10.0.26200 64-bit) GCC version: Could not collect Clang version: Could not collect CMake version: Could not collect Libc version: N/A Python version: 3.12.12 [MSC v.1944 64 bit (AMD64)] (64-bit runtime) Python platform: Windows-11-10.0.26200-SP0 Is CUDA available: False CUDA runtime version: No CUDA CUDA_MODULE_LOADING set to: N/A GPU models and configuration: No CUDA Nvidia driver version: No CUDA cuDNN version: No CUDA Is XPU available: False HIP runtime version: N/A MIOpen runtime version: N/A Is XNNPACK available: True Versions of relevant libraries: [pip3] intel-openmp==2021.4.0 [pip3] mkl==2021.4.0 [pip3] numpy==2.3.4 [pip3] tbb==2021.13.1 [pip3] torch==2.9.0 [pip3] torchaudio==2.9.0 [pip3] torchvision==0.24.0 [conda] Could not collect cc @seemethere @malfet @atalman @peterjc123 @mszhanyi @skyline75489 @nbcsm @iremyux @Blackhex

this comment might be helpfull
(temporary solution)try adding these lines before importing pytorch see if it works
import os
import platform
if platform.system() == “Windows”:
import ctypes
from importlib.util import find_spec
try:
if (spec := find_spec(“torch”)) and spec.origin and os.path.exists(
dll_path := os.path.join(os.path.dirname(spec.origin), “lib”, “c10.dll”)
):
ctypes.CDLL(os.path.normpath(dll_path))
except Exception: