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ollama - ✅(Solved) Fix Ollama on Windows on ARM trying to load wrong dlls [1 pull requests, 1 participants]

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ollama/ollama#15095•Fetched 2026-04-08 01:41:24
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Fix Action

Fixed

PR fix notes

PR #15097: windows: avoid probing x64 cpu variant dlls on arm64

Description (problem / solution / changelog)

Fixes #15095

On Windows ARM64, backend discovery probes CPU variant DLLs first (e.g. haswell/sse42/x64), which can trigger repeated wrong-architecture load failures.

This change detects Windows ARM64 and, for the CPU backend, loads the base ggml-cpu.dll directly instead of scanning CPU variant DLLs. That avoids loading x64 CPU variant DLLs on WoA and removes noisy load errors.

Changed files

  • ml/backend/ggml/ggml/src/ggml-backend-reg.cpp (modified, +42/-0)

Code Example

dl_load_library unable to load library C:\Users\Tourniquet\AppData\Roaming\ollama\v.0.18.3\lib\ollama\ggml-cpu-alderlake.dll: %1 ist keine zul�ssige Win32-Anwendung.

dl_load_library unable to load library C:\Users\Tourniquet\AppData\Roaming\ollama\v.0.18.3\lib\ollama\ggml-cpu-haswell.dll: %1 ist keine zul�ssige Win32-Anwendung.

dl_load_library unable to load library C:\Users\Tourniquet\AppData\Roaming\ollama\v.0.18.3\lib\ollama\ggml-cpu-icelake.dll: %1 ist keine zul�ssige Win32-Anwendung.

dl_load_library unable to load library C:\Users\Tourniquet\AppData\Roaming\ollama\v.0.18.3\lib\ollama\ggml-cpu-sandybridge.dll: %1 ist keine zul�ssige Win32-Anwendung.

dl_load_library unable to load library C:\Users\Tourniquet\AppData\Roaming\ollama\v.0.18.3\lib\ollama\ggml-cpu-skylakex.dll: %1 ist keine zul�ssige Win32-Anwendung.

dl_load_library unable to load library C:\Users\Tourniquet\AppData\Roaming\ollama\v.0.18.3\lib\ollama\ggml-cpu-sse42.dll: %1 ist keine zul�ssige Win32-Anwendung.

dl_load_library unable to load library C:\Users\Tourniquet\AppData\Roaming\ollama\v.0.18.3\lib\ollama\ggml-cpu-x64.dll: %1 ist keine zul�ssige Win32-Anwendung.

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What is the issue?

When you run Ollama on a Windows on ARM device, it still tries to load certain libraries that it shouldn't and can't load:

dl_load_library unable to load library C:\Users\Tourniquet\AppData\Roaming\ollama\v.0.18.3\lib\ollama\ggml-cpu-alderlake.dll: %1 ist keine zul�ssige Win32-Anwendung.

dl_load_library unable to load library C:\Users\Tourniquet\AppData\Roaming\ollama\v.0.18.3\lib\ollama\ggml-cpu-haswell.dll: %1 ist keine zul�ssige Win32-Anwendung.

dl_load_library unable to load library C:\Users\Tourniquet\AppData\Roaming\ollama\v.0.18.3\lib\ollama\ggml-cpu-icelake.dll: %1 ist keine zul�ssige Win32-Anwendung.

dl_load_library unable to load library C:\Users\Tourniquet\AppData\Roaming\ollama\v.0.18.3\lib\ollama\ggml-cpu-sandybridge.dll: %1 ist keine zul�ssige Win32-Anwendung.

dl_load_library unable to load library C:\Users\Tourniquet\AppData\Roaming\ollama\v.0.18.3\lib\ollama\ggml-cpu-skylakex.dll: %1 ist keine zul�ssige Win32-Anwendung.

dl_load_library unable to load library C:\Users\Tourniquet\AppData\Roaming\ollama\v.0.18.3\lib\ollama\ggml-cpu-sse42.dll: %1 ist keine zul�ssige Win32-Anwendung.

dl_load_library unable to load library C:\Users\Tourniquet\AppData\Roaming\ollama\v.0.18.3\lib\ollama\ggml-cpu-x64.dll: %1 ist keine zul�ssige Win32-Anwendung.

Relevant log output

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extent analysis

Fix Plan

The fix involves modifying the library loading mechanism to skip incompatible libraries on Windows on ARM devices.

  • Check the CPU architecture before loading libraries.
  • Skip loading libraries that are not compatible with the current CPU architecture.

Example code snippet in Python:

import platform
import ctypes

def load_library(lib_name):
    # Check if the system is Windows on ARM
    if platform.system() == 'Windows' and platform.machine() == 'ARM64':
        # Skip loading libraries that are not compatible with ARM64
        if 'x64' in lib_name or 'alderlake' in lib_name or 'haswell' in lib_name or 'icelake' in lib_name or 'sandybridge' in lib_name or 'skylakex' in lib_name or 'sse42' in lib_name:
            return None
    try:
        # Load the library using ctypes
        return ctypes.CDLL(lib_name)
    except OSError:
        # Handle the case where the library cannot be loaded
        return None

# Example usage:
lib_name = 'ggml-cpu-arm.dll'
lib = load_library(lib_name)
if lib:
    # Library loaded successfully
    print(f"Loaded library: {lib_name}")
else:
    # Library could not be loaded
    print(f"Failed to load library: {lib_name}")

Verification

To verify that the fix worked, run the modified code on a Windows on ARM device and check that it no longer attempts to load incompatible libraries.

Extra Tips

  • Make sure to update the library loading mechanism to handle different CPU architectures and operating systems.
  • Consider using a more robust library loading mechanism, such as using a configuration file to specify the libraries to load for each platform.

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