Add safety check to stop_guest function to prevent killing non-existent processes

test/benchmark/iperf3/tcp_virtio_bw/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit

test/benchmark/memcached/t16_conc64_window10k/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit

test/benchmark/memcached/t8_conc32_window10k/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit

test/benchmark/memcached/t8_conc32_window20k/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit

test/benchmark/nginx/http_file16KB_bw/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit

test/benchmark/nginx/http_file32KB_bw/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit

test/benchmark/nginx/http_file4KB_bw/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit

test/benchmark/nginx/http_file64KB_bw/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit

test/benchmark/nginx/http_file8KB_bw/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit

test/benchmark/nginx/http_req10k_conc1_bw/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit

test/benchmark/nginx/http_req10k_conc20_bw/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit

test/benchmark/redis/get_100k_conc20_rps/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit

test/benchmark/redis/ping_inline_100k_conc20_rps/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit

test/benchmark/redis/ping_mbulk_100k_conc20_rps/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit

test/benchmark/redis/set_100k_conc20_rps/host.sh

@@ -7,7 +7,8 @@ set -e
 # Function to stop the guest VM
 stop_guest() {
     echo "Stopping guest VM..."
-    pgrep qemu | xargs kill
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
 }
 
 # Trap EXIT signal to ensure guest VM is stopped on script exit