Cuda-gdb can't step into kernel code in WSL2

Developer Tools CUDA Developer Tools CUDA-GDB
1

Problem I encountered

As the topic says, I keep encountering this issue:

[Detaching after vfork from child process 5146]
WARNING: Debug interface is not enabled. Please see https://docs.nvidia.com/cuda/cuda-gdb/index.html#supported-platforms for more details.

My environment

🦄  uname -r
6.6.87.1-microsoft-standard-WSL2

🦄  nvidia-smi
Tue Oct  7 22:43:46 2025
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 575.64.01              Driver Version: 576.80         CUDA Version: 12.9     |
|-----------------------------------------+------------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id          Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util  Compute M. |
|                                         |                        |               MIG M. |
|=========================================+========================+======================|
|   0  NVIDIA GeForce RTX 3070 ...    On  |   00000000:01:00.0  On |                  N/A |
| N/A   53C    P5             21W /  125W |    1450MiB /   8192MiB |      8%      Default |
|                                         |                        |                  N/A |
+-----------------------------------------+------------------------+----------------------+

+-----------------------------------------------------------------------------------------+
| Processes:                                                                              |
|  GPU   GI   CI              PID   Type   Process name                        GPU Memory |
|        ID   ID                                                               Usage      |
|=========================================================================================|
|    0   N/A  N/A              33      G   /Xwayland                             N/A      |
+-----------------------------------------------------------------------------------------+

I already set `Allow access to the GPU performance counters to all users` in NVIDIA Control Panel.

And I already set all the related environment variables.

PS C:\WINDOWS\system32> reg query "HKLM\SOFTWARE\NVIDIA Corporation\GPUDebugger" /v EnableInterface

HKEY_LOCAL_MACHINE\SOFTWARE\NVIDIA Corporation\GPUDebugger
    EnableInterface    REG_DWORD    0x1

PS C:\WINDOWS\system32> reg query "HKLM\SYSTEM\CurrentControlSet\Control\GraphicsDrivers" /v TdrDelay

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers
    TdrDelay    REG_DWORD    0x3c

PS C:\WINDOWS\system32> reg query "HKLM\SYSTEM\CurrentControlSet\Control\GraphicsDrivers" /v TdrDdiDelay

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers
    TdrDdiDelay    REG_DWORD    0x3c

PS C:\WINDOWS\system32> reg query "HKLM\SYSTEM\CurrentControlSet\Control\GraphicsDrivers" /v TdrLevel

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers
    TdrLevel    REG_DWORD    0x0
2

Hi, @1154330861

Sorry for the issue you met.

How do you access WSL2 in this case ?

3

I have tried :

  1. Use powershell directly.
  2. Use VS Code to connect to WSL2.
4

In powershell, are you using “$wsl” to enter directly ?
Asking this because we have known issue if enter into WSL by remote SSH.

5

I type “ubuntu” in Windows start menu, and uses the powershell terminal it provides.
I’m not sure if it has the same effect as the way you mentioned.

image
image1142Ă—930 54.3 KB

7

Hi, @1154330861
Thanks for the response ! Then this is not the same issue as I mentioned.
There is an known debugger issue with windows driver 576.80.
Can you please try with a previous driver 576.57 to have a try Driver Details | NVIDIA, thanks !

8

Thank you!
Is a specific version of the CUDA Toolkit required to use cuda-gdb on WSL2—such as 12.x?
I’m currently on CUDA 11.8, but I was told that cuda-gdb only works with CUDA 12.x in WSL2.

9

I’m using a RTX 3070ti GPU, it seems that 576.57 it’s not supported on this device.

10

Hi, @1154330861

You’d better use aligned CUDA version.
We didn’t test CUDA 11.8 with R575 internally, so this is not guaranteed to work.

image
image862Ă—126 11.3 KB

11

Thanks! I’ll give it a shot.

12

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