Looks like 10% failure rate:
for i in $(seq 0 100); do ./test_sgx | grep failed; done SGX_IOC_ENCLAVE_INIT failed: errno=1 SGX_IOC_ENCLAVE_INIT failed: errno=1 SGX_IOC_ENCLAVE_INIT failed: errno=1 SGX_IOC_ENCLAVE_INIT failed: errno=1 SGX_IOC_ENCLAVE_INIT failed: errno=1 SGX_IOC_ENCLAVE_INIT failed: errno=1 SGX_IOC_ENCLAVE_INIT failed: errno=1 SGX_IOC_ENCLAVE_INIT failed: errno=1 SGX_IOC_ENCLAVE_INIT failed: errno=1