diff --git a/.github/workflows/kernel_test.yml b/.github/workflows/kernel_test.yml
index 70755a42d..27f363b44 100644
--- a/.github/workflows/kernel_test.yml
+++ b/.github/workflows/kernel_test.yml
@@ -80,6 +80,6 @@ jobs:
         id: syscall_test_at_exfat_linux
         run: make run AUTO_TEST=syscall SYSCALL_TEST_DIR=/exfat EXTRA_BLOCKLISTS_DIRS=blocklists.exfat ENABLE_KVM=0 BOOT_PROTOCOL=linux-efi-handover64 RELEASE_MODE=1
         
-      - name: Regression Test (MicroVM)
+      - name: Regression Test (Multiboot2)
         id: regression_test_linux
-        run: make run AUTO_TEST=regression ENABLE_KVM=0 SCHEME=microvm RELEASE_MODE=1
+        run: make run AUTO_TEST=regression ENABLE_KVM=0 BOOT_PROTOCOL=multiboot2 RELEASE_MODE=1
diff --git a/regression/apps/scripts/ext2.sh b/regression/apps/scripts/ext2.sh
index 249556840..001d30cd8 100755
--- a/regression/apps/scripts/ext2.sh
+++ b/regression/apps/scripts/ext2.sh
@@ -3,6 +3,7 @@
 # SPDX-License-Identifier: MPL-2.0
 
 set -e
+set -x
 
 check_file_size() {
     local file_name="$1"
@@ -29,10 +30,15 @@ cd ${EXT2_DIR}
 echo "Start ext2 fs test......"
 
 # Test case for the big file feature
-truncate -s 500M test_file.txt
-check_file_size test_file.txt $((500 * 1024 * 1024))
-truncate -s 2K test_file.txt
-check_file_size test_file.txt $((2 * 1024))
+for i in $(seq 1 10); do
+    truncate -s 500M test_file.txt
+    check_file_size test_file.txt $((500 * 1024 * 1024))
+    truncate -s 2K test_file.txt
+    check_file_size test_file.txt $((2 * 1024))
+done
+
+# Clean up
+rm -f test_file.txt
 sync
 
 echo "All ext2 fs test passed."
\ No newline at end of file