Fix cudaErrorNvlinkUncorrectable: NVLink Hardware Error

Overview

cudaErrorNvlinkUncorrectable indicates a hardware-level error in NVLink communication. This is a serious hardware issue.

Error Messages

CUDA error: nvlink uncorrectable error
cudaErrorNvlinkUncorrectable

Common Causes

• •Hardware failure in NVLink bridge
• •Overheating causing link errors
• •Physical connection issue
• •ECC errors in NVLink

Solutions

nvidia-smi nvlink -s
nvidia-smi nvlink -e

nvidia-smi -r

nvidia-smi -q -d TEMPERATURE

Prevention Tips

• ✓Monitor NVLink status regularly
• ✓Ensure adequate cooling
• ✓Contact NVIDIA support for persistent errors

Code Examples

Before (Problematic)

Hardware errors cause data corruption.

// Ignoring NVLink errors and continuing

After (Fixed)

Stop and investigate hardware.

if (err == cudaErrorNvlinkUncorrectable) {
    log_error("NVLink hardware failure");
    shutdown_gracefully();
}

Frequently Asked Questions

Related Errors

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