diff --git a/tests/unit/test_fmha_hd64_smem_p.cu b/tests/unit/test_fmha_hd64_smem_p.cu
index 2ab0773e..07a7607c 100644
--- a/tests/unit/test_fmha_hd64_smem_p.cu
+++ b/tests/unit/test_fmha_hd64_smem_p.cu
@@ -221,8 +221,12 @@ int main() {
     printf("SMEM: %d bytes (%.1f KB, limit 232 KB)\n", smem, smem/1024.0f);
     test_fmha_hd64_smem_p<<<1, 128, smem>>>(d_q, d_k, d_v, d_o, d_o_scalar, SCALE);
 
+    cudaError_t launch_err = cudaGetLastError();
+    if (launch_err != cudaSuccess) { printf("LAUNCH ERROR: %s\n", cudaGetErrorString(launch_err)); return 1; }
+
     cudaError_t err = cudaDeviceSynchronize();
     if (err != cudaSuccess) { printf("CUDA ERROR: %s\n", cudaGetErrorString(err)); return 1; }
+    if (err != cudaSuccess) { printf("CUDA ERROR: %s\n", cudaGetErrorString(err)); return 1; }
 
     cudaMemcpy(h_o, d_o, HD*sizeof(bf16_t), cudaMemcpyDeviceToHost);
     cudaMemcpy(h_o_scalar, d_o_scalar, HD*sizeof(float), cudaMemcpyDeviceToHost);