Troubleshoot GPU VMs

This page shows you how to resolve issues for VMs running on Compute Engine that have attached GPUs.

If you are trying to create a VM with attached GPUs and are getting errors, review Troubleshooting resource availability errors and Troubleshooting creating and updating VMs.

Troubleshoot GPU VMs by using NVIDIA DCGM

NVIDIA Data Center GPU Manager (DCGM) is a suite of tools for managing and monitoring NVIDIA data center GPUs in cluster environments.

If you want to use DCGM to troubleshoot issues in your GPU environment, complete the following:

Ensure that you are using the latest recommended NVIDIA driver for the GPU model that is attached to your VM. To review driver versions, see Recommended NVIDIA driver versions.
Ensure that you installed the latest version of DCGM. To install the latest version, see DCGM installation.

Diagnose issues

When you run a dcgmi diagnostic command, the issues reported by the diagnostic tool include next steps for taking action on the issue. The following example shows the actionable output from the dcgmi diag -r memory -j command.

{
  ........
   "category":"Hardware",
   "tests":[
      {
         "name":"GPU Memory",
         "results":[
            {
               "gpu_id":"0",
               "info":"GPU 0 Allocated 23376170169
bytes (98.3%)",
               "status":"Fail",
               ""warnings":[
                  {
                     "warning":"Pending page
retirements together with a DBE were detected on GPU 0. Drain the GPU and reset it or reboot the node to resolve this issue.",
                     "error_id":83,
                     "error_category":10,
                     "error_severity":6
                  }
               ]
            }
  .........

From the preceding output snippet, you can see that GPU 0 has pending page retirements that are caused by a non-recoverable error. The output provided the unique error_id and advice on debugging the issue. For this example output, it is recommended that you drain the GPU and reboot the VM. In most cases, following the instructions in this section of the output can help to resolve the issue.

Open a support case

If you are unable to resolve the issues by using the guidance provided by the output of your dcgmi diagnostic run, you can open a support case. When you open a support case, you need to provide the following information:

The command that was run and the output returned.
Relevant log files such as host engine and diagnostic logs. To gather the required log files, you can run the gather-dcgm-logs.sh script.

For a default installation on Debian and RPM-based systems, this script is located in /usr/local/dcgm/scripts.
For dcgmi diag failures, provide the stats files for the plugins that failed. The stats file uses the following naming convention: stats_PLUGIN_NAME.json.

For example, if the pcie plugin failed, include the file named stats_pcie.json.
NVIDIA system information and driver state. To gather this information, you can run the nvidia-bug-report.sh script.

Running this script also helps with additional debugging if the problem is caused by other NVIDIA dependencies and not a bug in DCGM itself.
Details about any recent changes that were made to your environment preceding the failure.

Xid messages

After you create a VM that has attached GPUs, you must install NVIDIA device drivers on your GPU VMs so that your applications can access the GPUs. However, sometimes these drivers return error messages.

An Xid message is an error report from the NVIDIA driver that is printed to the operating system's kernel log or event log for your Linux VM. These messages are placed in the /var/log/messages file.

For more information about Xid messages including potential causes, see NVIDIA documentation.

The following section provides guidance on handling some Xid messages grouped by the most common types: GPU memory errors, GPU System Processor (GSP) errors, and illegal memory access errors.

GPU memory errors

GPU memory is the memory that is available on a GPU that can be used for temporary storage of data. GPU memory is protected with Error Correction Code, ECC, which detects and corrects single bit errors (SBE) and detects and reports Double Bit Errors (DBE).

Prior to the release of the NVIDIA A100 GPUs, dynamic page retirement was supported. For NVIDIA A100 and later GPU releases (such as NVIDIA H100), row remap error recovery is introduced. ECC is enabled by default. Google highly recommends keeping ECC enabled.

The following are common GPU memory errors and their suggested resolutions.

Xid error message	Resolution
`Xid 48: Double Bit ECC`	Stop your workloads. Delete and recreate the VM. If the error persists, file a case with Cloud Customer Care.
`Xid 63: ECC page retirement or row remapping recording event`	Stop your workloads. Reset the GPUs.
`Xid 64: ECC page retirement or row remapper recording failure` And the message contains the following information: `Xid 64: All reserved rows for bank are remapped`	Stop your workloads. Delete and recreate the VM. If the error persists, file a case with Cloud Customer Care.
If you get at least two of the following Xid messages together: `Xid 48` `Xid 63` `Xid 64` And the message contains the following information: `Xid XX: row remap pending`	Stop your workloads. Reset the GPUs. Resetting the GPU allows the row remap and page retirement process to complete and heal the GPU.
`Xid 92: High single-bit ECC error rate`	This Xid message is returned after the GPU driver corrects a correctable error, and it shouldn't affect your workloads. This Xid message is informational only. No action is needed.
`Xid 94: Contained ECC error`	Stop your workloads. Reset the GPUs.
`Xid 95: Uncontained ECC error`	Stop your workloads. Reset the GPUs.

GSP errors

A GPU System Processor (GSP) is a microcontroller that runs on GPUs and handles some of the low level hardware management functions.

Xid error message	Resolution
`Xid 119: GSP RPC timeout`	Stop your workloads. Delete and recreate the VM. If the error persists, collect the NVIDIA bug report and file a case with Cloud Customer Care.
`Xid 120: GSP error`

Illegal memory access errors

The following Xids are returned when applications have illegal memory access issues:

Xid 13: Graphics Engine Exception
Xid 31: GPU memory page fault

Illegal memory access errors are typically caused by your workloads trying to access memory that is already freed or is out of bounds. This can be caused by issues such as the dereferencing of an invalid pointer, or an out bounds array.

To resolve this issue, you need to debug your application. To debug your application, you can use cuda-memcheck and CUDA-GDB.

In some very rare cases, hardware degradation might cause illegal memory access errors to be returned. To identify if the issue is with your hardware, use NVIDIA Data Center GPU Manager (DCGM). You can run dcgmi diag -r 3 or dcgmi diag -r 4 to run different levels of test coverage and duration. If you identify that the issue is with the hardware, file a case with Cloud Customer Care.

Other common Xid error messages

Xid error message	Resolution
`Xid 74: NVLINK error`	Stop your workloads. Reset the GPUs.
`Xid 79: GPU has fallen off the bus` This means the driver is not able to communicate with the GPU.	Reboot the VM.

Reset GPUs

Some issues might require you to reset your GPUs. To reset GPUs, complete the following steps:

For N1, G2, and A2 VMs, reboot the VM by running sudo reboot.
For A3 VMs, run nvidia-smi reset GPU.

If errors persist after resetting the GPU, you need to delete and recreate the VM.

If the error persists after a delete and recreate, file a case with Cloud Customer Care to move the VM into the repair stage.