diff --git a/.github/workflows/gem5.yml b/.github/workflows/gem5.yml
index 6b370b9122..d9ef4d5fba 100644
--- a/.github/workflows/gem5.yml
+++ b/.github/workflows/gem5.yml
@@ -126,3 +126,33 @@ jobs:
           mkdir -p $GEM5_HOME/util/xs_scripts/test_multi_core
           cd $GEM5_HOME/util/xs_scripts/test_multi_core
           bash ../kmh-ruby-dual.sh /nfs-nvme/home/share/zyy/shared_payloads/bzip_checkpoint_with_sv39_without_rdtime_with_dualmtimecpt_1000M.gz
+
+    difftest_check:
+    runs-on: self-hosted
+    continue-on-error: false
+    name: XS-GEM5 - Check difftest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build DRAMSim
+        run: |
+          export GEM5_HOME=$(pwd)
+          cd ext/dramsim3
+          git clone git@github.com:umd-memsys/DRAMSim3.git DRAMsim3
+          cd DRAMsim3 && mkdir -p build
+          cd build
+          cmake ..
+          make -j 48
+          cd $GEM5_HOME
+      - name: Build GEM5 debug
+        run: CC=clang CXX=clang++ scons build/RISCV/gem5.opt -j 48 --gold-linker
+      - name: difftest check
+        run: |
+          export GCBV_REF_SO="/nfs-nvme/home/share/zhenhao/ref-h/build-error/riscv64-nemu-interpreter-so"
+          export GCB_RESTORER="/nfs-nvme/home/share/zhenhao/LibCheckpointAlpha/build/gcpt.bin"
+          export GEM5_HOME=$(pwd)
+          mkdir -p $GEM5_HOME/util/xs_scripts/test
+          cd $GEM5_HOME/util/xs_scripts/test
+          bash ../kmh_6wide.sh /nfs/home/share/jiaxiaoyu/simpoint_checkpoint_archive/spec06_rv64gcb_O3_20m_gcc12.2.0-intFpcOff-jeMalloc/zstd-checkpoint-0-0-0/xalancbmk/133/_133_0.006424_.zstd 2>log.txt || exit_code=$?
+          if [ ${exit_code} -eq 0 ]; then echo "Difftest is broken, it should report error!" exit 1; fi
+          match=$(grep ".*Difftest failed!.*" log.txt -c)
+          if [ ${match} -eq 0 ]; then echo "Difftest is broken, it should report at least one agnostic related difference!" exit 1; fi