Fix cudaErrorSymbolNotFound: Missing CUDA Symbol

Overview

cudaErrorSymbolNotFound occurs when CUDA cannot find a requested kernel or device symbol.

Error Messages

CUDA error: symbol not found
cudaErrorSymbolNotFound

Common Causes

• •Typo in symbol name
• •Symbol not exported
• •C++ name mangling
• •Separate compilation issues

Solutions

extern "C" __global__ void myKernel() {}

cuobjdump --list-text kernel.cubin

Prevention Tips

• ✓Use extern "C" for kernels
• ✓Verify symbol names with cuobjdump

Code Examples

Before (Problematic)

Name must match exactly.

cuModuleGetFunction(&f, mod, "kernel");  // Wrong name

After (Fixed)

extern C and exact name.

extern "C" __global__ void kernel() {}
cuModuleGetFunction(&f, mod, "kernel");

Frequently Asked Questions

Related Errors

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