fix(stress): label loaders and improve john opencl diagnostics

iso/overlay/usr/local/bin/bee-john-gpu-stress

@@ -7,6 +7,8 @@ EXCLUDE=""
 FORMAT=""
 JOHN_DIR="/usr/local/lib/bee/john/run"
 JOHN_BIN="${JOHN_DIR}/john"
+export OCL_ICD_VENDORS="/etc/OpenCL/vendors"
+export LD_LIBRARY_PATH="/usr/lib:/usr/local/lib${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}"
 
 usage() {
     echo "usage: $0 [--seconds N] [--devices 0,1] [--exclude 2,3] [--format name]" >&2
@@ -24,6 +26,21 @@ contains_csv() {
 }
 
 show_opencl_diagnostics() {
+    echo "-- OpenCL ICD vendors --" >&2
+    if [ -d /etc/OpenCL/vendors ]; then
+        ls -l /etc/OpenCL/vendors >&2 || true
+        for icd in /etc/OpenCL/vendors/*.icd; do
+            [ -f "${icd}" ] || continue
+            echo "  file: ${icd}" >&2
+            sed 's/^/    /' "${icd}" >&2 || true
+        done
+    else
+        echo "  /etc/OpenCL/vendors is missing" >&2
+    fi
+    echo "-- NVIDIA device nodes --" >&2
+    ls -l /dev/nvidia* >&2 || true
+    echo "-- ldconfig OpenCL/NVIDIA --" >&2
+    ldconfig -p 2>/dev/null | grep 'libOpenCL\|libcuda\|libnvidia-opencl' >&2 || true
     if command -v clinfo >/dev/null 2>&1; then
         echo "-- clinfo -l --" >&2
         clinfo -l >&2 || true
@@ -32,6 +49,17 @@ show_opencl_diagnostics() {
     ./john --list=opencl-devices >&2 || true
 }
 
+refresh_nvidia_runtime() {
+    if [ "$(id -u)" != "0" ]; then
+        return 1
+    fi
+    if command -v bee-nvidia-load >/dev/null 2>&1; then
+        bee-nvidia-load >/dev/null 2>&1 || true
+    fi
+    ldconfig >/dev/null 2>&1 || true
+    return 0
+}
+
 ensure_nvidia_uvm() {
     if lsmod 2>/dev/null | grep -q '^nvidia_uvm '; then
         return 0
@@ -61,6 +89,13 @@ ensure_opencl_ready() {
         return 0
     fi
 
+    if refresh_nvidia_runtime; then
+        out=$(./john --list=opencl-devices 2>&1 || true)
+        if echo "${out}" | grep -q "Device #"; then
+            return 0
+        fi
+    fi
+
     if ensure_nvidia_uvm; then
         out=$(./john --list=opencl-devices 2>&1 || true)
         if echo "${out}" | grep -q "Device #"; then