diff --git a/.github/workflows/develop.yml b/.github/workflows/develop.yml
new file mode 100644
index 00000000..cf404dca
--- /dev/null
+++ b/.github/workflows/develop.yml
@@ -0,0 +1,174 @@
+name: develop
+
+on:
+  pull_request:
+  push:
+
+jobs:
+
+  linux-x86-deny:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      # https://github.com/EmbarkStudios/cargo-deny-action
+      - uses: EmbarkStudios/cargo-deny-action@v1
+        with:
+          arguments: --all-features
+          command: check advisories licenses sources bans
+
+  linux-x86-ci-generated:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run ci-generated
+        run: make ci-generated
+
+  linux-x86-ci:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run ci
+        run: rustup component add clippy rustfmt && make ci
+
+  linux-x86-ci-asm:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run ci-asm
+        run: make ci-asm
+
+  linux-x86-ci-asm-chaos:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run ci-asm-chaos
+        run: make ci-asm-chaos
+
+  linux-x86-test-suite:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install dependencies
+        run: |
+          sudo apt install -y git \
+                              build-essential \
+                              autoconf \
+                              automake \
+                              autotools-dev \
+                              libmpc-dev \
+                              libmpfr-dev \
+                              libgmp-dev \
+                              gawk \
+                              libtool \
+                              patchutils \
+                              libexpat-dev \
+                              zlib1g-dev
+      - name: Run test suite
+        run: |
+          git clone https://github.com/nervosnetwork/ckb-vm-test-suite
+          ln -snf .. ckb-vm-test-suite/ckb-vm
+          docker run --rm -v `pwd`:/code nervos/ckb-riscv-gnu-toolchain:bionic-20210804 cp -r /riscv /code/riscv
+          cd ckb-vm-test-suite
+          git checkout 441e0f2149c097ccad133b040544dca13caeb01e
+          git submodule update --init --recursive
+          RISCV=`pwd`/../riscv ./test.sh
+
+  linux-x86-test-spawn:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run spawn tests in release
+        run: cargo test test_spawn --release --features=asm -- --nocapture
+
+  linux-arm-ci-asm:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install dependencies
+        run: |
+          sudo apt-get update -y
+          sudo apt install -y build-essential \
+                              autoconf \
+                              automake \
+                              autotools-dev \
+                              libmpc-dev \
+                              libmpfr-dev \
+                              libgmp-dev \
+                              gawk \
+                              libtool \
+                              patchutils \
+                              libexpat-dev \
+                              zlib1g-dev \
+                              gcc-aarch64-linux-gnu \
+                              g++-aarch64-linux-gnu \
+                              qemu-user-static
+          rustup target add aarch64-unknown-linux-gnu
+      - name: Run ci-asm
+        run: |
+          export CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc &&
+          export CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_RUSTFLAGS="-C link-args=-L -C link-args=/usr/lib/gcc-cross/aarch64-linux-gnu/11" &&
+          export CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_RUNNER="qemu-aarch64-static -L /usr/aarch64-linux-gnu" &&
+          cargo test --features=asm --target aarch64-unknown-linux-gnu
+
+  linux-arm-test-suite:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install dependencies
+        run: |
+          sudo apt update -y
+          sudo apt install -y build-essential \
+                              autoconf \
+                              automake \
+                              autotools-dev \
+                              libmpc-dev \
+                              libmpfr-dev \
+                              libgmp-dev \
+                              gawk \
+                              libtool \
+                              patchutils \
+                              libexpat-dev \
+                              zlib1g-dev
+          rustup target add aarch64-unknown-linux-gnu
+      - name: Build test suite
+        run: |
+          git clone https://github.com/nervosnetwork/ckb-vm-test-suite
+          ln -snf .. ckb-vm-test-suite/ckb-vm
+          docker run --rm -v `pwd`:/code nervos/ckb-riscv-gnu-toolchain:bionic-20210804 cp -r /riscv /code/riscv
+          cd ckb-vm-test-suite
+          git checkout 441e0f2149c097ccad133b040544dca13caeb01e
+          git submodule update --init --recursive
+          RISCV=`pwd`/../riscv ./test.sh --build-only
+          cd ..
+      - name: Run test suite
+        run: |
+          sudo apt install -y qemu binfmt-support qemu-user-static
+          sudo apt install -y gcc-multilib
+          sudo apt install -y gcc-aarch64-linux-gnu g++-aarch64-linux-gnu clang
+          docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+          cd ckb-vm-test-suite
+          cd binary && cargo build --release --target=aarch64-unknown-linux-gnu && cd ..
+          cd ..
+          docker run --rm -v `pwd`:/code -t --platform linux/arm64 arm64v8/rust bash -c "RISCV=/dummy /code/ckb-vm-test-suite/test.sh --prebuilt-prefix aarch64-unknown-linux-gnu"
+
+  macos-x86-ci-asm:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run ci-asm
+        run: make ci-asm
+
+  windows-x86-ci-asm:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install dependencies
+        shell: pwsh
+        # https://github.com/ScoopInstaller/Install#for-admin
+        run: |
+          iex "& {$(irm get.scoop.sh)} -RunAsAdmin"
+          scoop install mingw
+      - name: Run ci-asm
+        shell: pwsh
+        run: |
+          make ci-asm
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
deleted file mode 100644
index 9935276c..00000000
--- a/azure-pipelines.yml
+++ /dev/null
@@ -1,199 +0,0 @@
-trigger:
-  branches:
-    include:
-    - '*'
-  tags:
-    include:
-    - '*'
-
-variables:
-  TEST_SUITE_COMMIT: 441e0f2149c097ccad133b040544dca13caeb01e
-
-jobs:
-  - job: LinuxCIDeps
-    pool:
-      vmImage: 'ubuntu-20.04'
-    steps:
-      - template: devtools/azure/linux-dependencies.yml
-      - script: cargo install cargo-deny --locked --version 0.12.1
-        displayName: Install cargo deny
-      - script: make ci-deps
-        displayName: Run ci-deps
-
-  - job: LinuxCIGenerated
-    pool:
-      vmImage: 'ubuntu-20.04'
-    steps:
-      - template: devtools/azure/linux-dependencies.yml
-      - script: make ci-generated
-        displayName: Run ci-generated
-
-  - job: LinuxCIASM
-    pool:
-      vmImage: 'ubuntu-20.04'
-    steps:
-      - template: devtools/azure/linux-dependencies.yml
-      - script: make ci-asm
-        displayName: Run ci-asm
-
-  - job: LinuxCI
-    pool:
-      vmImage: 'ubuntu-20.04'
-    steps:
-      - template: devtools/azure/linux-dependencies.yml
-      - script: make ci
-        displayName: Run ci
-
-  - job: LinuxCIASMChaos
-    pool:
-      vmImage: 'ubuntu-20.04'
-    steps:
-      - template: devtools/azure/linux-dependencies.yml
-      - script: make ci-asm-chaos
-        displayName: Run ci-asm-chaos
-
-  - job: LinuxTestSuite
-    pool:
-      vmImage: 'ubuntu-20.04'
-    steps:
-      - template: devtools/azure/linux-dependencies.yml
-      - script: |
-          sudo apt install -y git \
-                              build-essential \
-                              autoconf \
-                              automake \
-                              autotools-dev \
-                              libmpc-dev \
-                              libmpfr-dev \
-                              libgmp-dev \
-                              gawk \
-                              libtool \
-                              patchutils \
-                              libexpat-dev \
-                              zlib1g-dev
-      - script: |
-          git clone https://github.com/nervosnetwork/ckb-vm-test-suite &&
-          ln -snf .. ckb-vm-test-suite/ckb-vm &&
-          docker run --rm -v `pwd`:/code nervos/ckb-riscv-gnu-toolchain:bionic-20210804 cp -r /riscv /code/riscv &&
-          cd ckb-vm-test-suite &&
-          git checkout $TEST_SUITE_COMMIT &&
-          git submodule update --init --recursive &&
-          RISCV=`pwd`/../riscv ./test.sh
-        displayName: Run test suite
-
-  - job: LinuxArm64AsmCI
-    pool:
-      vmImage: 'ubuntu-20.04'
-    steps:
-      - template: devtools/azure/linux-dependencies.yml
-      - script: |
-          sudo apt-get install -y qemu binfmt-support qemu-user-static
-          docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
-          echo "Comment: updating crates.io cause oom in arm docker, use -v /usr/local/cargo/registry/:/usr/local/cargo/registry/ to skip this problem"
-          cargo update
-          docker run --rm -v `pwd`:/code -v /home/vsts/.cargo/registry/:/usr/local/cargo/registry/ -t arm64v8/rust bash -c "cd /code && cargo test --features=asm"
-        displayName: Run ci-asm on arm64 machines
-
-  - job: LinuxArm64TestSuite
-    pool:
-      vmImage: 'ubuntu-20.04'
-    steps:
-      - template: devtools/azure/linux-dependencies.yml
-      - script: |
-          sudo apt update -y &&
-          sudo apt install -y git \
-                              build-essential \
-                              autoconf \
-                              automake \
-                              autotools-dev \
-                              libmpc-dev \
-                              libmpfr-dev \
-                              libgmp-dev \
-                              gawk \
-                              libtool \
-                              patchutils \
-                              libexpat-dev \
-                              zlib1g-dev
-      - script: |
-          git clone https://github.com/nervosnetwork/ckb-vm-test-suite &&
-          ln -snf .. ckb-vm-test-suite/ckb-vm &&
-          docker run --rm -v `pwd`:/code nervos/ckb-riscv-gnu-toolchain:bionic-20210804 cp -r /riscv /code/riscv &&
-          cd ckb-vm-test-suite &&
-          git checkout $TEST_SUITE_COMMIT &&
-          git submodule update --init --recursive &&
-          RISCV=`pwd`/../riscv ./test.sh --build-only &&
-          cd ..
-        displayName: Build test suite
-      - script: |
-          sudo apt-get install -y qemu binfmt-support qemu-user-static
-          sudo apt-get install -y gcc-multilib
-          sudo apt-get install -y gcc-aarch64-linux-gnu g++-aarch64-linux-gnu clang
-          rustup target add aarch64-unknown-linux-gnu
-          docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
-          cd ckb-vm-test-suite &&
-          cd binary && cargo build --release --target=aarch64-unknown-linux-gnu && cd .. &&
-          cd .. &&
-          docker run --rm -v `pwd`:/code -t arm64v8/rust bash -c "RISCV=/dummy /code/ckb-vm-test-suite/test.sh --prebuilt-prefix aarch64-unknown-linux-gnu"
-        displayName: Run test suite on arm64 machines
-
-  - job: LinuxCodeCoverage
-    condition: eq(variables['Build.SourceBranch'], 'refs/heads/release')
-    pool:
-      vmImage: 'ubuntu-20.04'
-    steps:
-      - template: devtools/azure/linux-dependencies.yml
-      - script: |
-          sudo apt install -y git \
-                              build-essential \
-                              autoconf \
-                              automake \
-                              autotools-dev \
-                              libmpc-dev \
-                              libmpfr-dev \
-                              libgmp-dev \
-                              gawk \
-                              libtool \
-                              patchutils \
-                              libexpat-dev \
-                              binutils-dev \
-                              libcurl4-openssl-dev \
-                              zlib1g-dev \
-                              libdw-dev \
-                              libiberty-dev
-      - script: |
-          wget https://github.com/SimonKagstrom/kcov/archive/v36.tar.gz &&
-          tar xzf v36.tar.gz &&
-          cd kcov-36 &&
-          mkdir build &&
-          cd build &&
-          cmake .. &&
-          make &&
-          sudo make install &&
-          cd ../.. &&
-          rm -rf kcov-36 v36.tar.gz &&
-          git clone https://github.com/nervosnetwork/ckb-vm-test-suite &&
-          ln -snf .. ckb-vm-test-suite/ckb-vm &&
-          docker run --rm -v `pwd`:/code nervos/ckb-riscv-gnu-toolchain:bionic-20210804 cp -r /riscv /code/riscv &&
-          cd ckb-vm-test-suite && git checkout $TEST_SUITE_COMMIT && git submodule update --init --recursive &&
-          RISCV=`pwd`/../riscv ./test.sh --coverage &&
-          cd .. &&
-          make cov &&
-          bash <(curl -s https://codecov.io/bash) &&
-          echo "Uploaded code coverage"
-        displayName: Run code coverage
-
-  - job: OSXCI
-    pool:
-      vmImage: 'macOS-11'
-    steps:
-      - template: devtools/azure/osx-dependencies.yml
-      - script: make ci-asm
-        displayName: Run unit tests
-
-  - job: WinCI
-    pool:
-      vmImage: 'windows-2019'
-    steps:
-      - template: devtools/azure/windows-dependencies.yml
-      - script: make ci-asm
-        displayName: Run unit tests
diff --git a/definitions/src/asm.rs b/definitions/src/asm.rs
index 402505f8..768e46fa 100644
--- a/definitions/src/asm.rs
+++ b/definitions/src/asm.rs
@@ -2,7 +2,7 @@ use crate::{
     instructions::Instruction, MEMORY_FRAMES, MEMORY_FRAMESIZE, MEMORY_FRAME_SHIFTS,
     RISCV_GENERAL_REGISTER_NUMBER, RISCV_MAX_MEMORY, RISCV_PAGES, RISCV_PAGESIZE,
 };
-use std::alloc::{alloc, Layout};
+use std::alloc::{alloc_zeroed, Layout};
 
 // The number of trace items to keep
 pub const TRACE_SIZE: usize = 8192;
@@ -88,29 +88,19 @@ impl AsmCoreMachine {
                 std::mem::size_of::<AsmCoreMachine>() - RISCV_MAX_MEMORY + memory_size;
 
             let layout = Layout::array::<u8>(machine_size).unwrap();
-            let raw_allocation = alloc(layout) as *mut AsmCoreMachine;
+            let raw_allocation = alloc_zeroed(layout) as *mut AsmCoreMachine;
             Box::from_raw(raw_allocation)
         };
-        machine.registers = [0; RISCV_GENERAL_REGISTER_NUMBER];
-        machine.pc = 0;
-        machine.next_pc = 0;
-        machine.running = 0;
-        machine.cycles = 0;
         machine.max_cycles = max_cycles;
         if cfg!(feature = "enable-chaos-mode-by-default") {
             machine.chaos_mode = 1;
-        } else {
-            machine.chaos_mode = 0;
         }
-        machine.chaos_seed = 0;
-        machine.reset_signal = 0;
+        machine.load_reservation_address = u64::MAX;
         machine.version = version;
         machine.isa = isa;
-        machine.flags = [0; RISCV_PAGES];
         for i in 0..TRACE_SIZE {
             machine.traces[i] = Trace::default();
         }
-        machine.frames = [0; MEMORY_FRAMES];
 
         machine.memory_size = memory_size as u64;
         machine.frames_size = (memory_size / MEMORY_FRAMESIZE) as u64;
diff --git a/tests/programs/_build_all_native.sh b/tests/programs/_build_all_native.sh
index d507c829..d1f2a627 100755
--- a/tests/programs/_build_all_native.sh
+++ b/tests/programs/_build_all_native.sh
@@ -52,6 +52,7 @@ riscv64-unknown-elf-as -o rorw_in_end_of_aot_block.o rorw_in_end_of_aot_block.S
 sh rvc_pageend.sh
 # TODO: sbinvi_aot_load_imm_bug
 riscv64-unknown-elf-as -o sc_after_sc.o sc_after_sc.S && riscv64-unknown-elf-ld -T sc_after_sc.lds -o sc_after_sc sc_after_sc.o && rm sc_after_sc.o
+riscv64-unknown-elf-as -o sc_only.o sc_only.S && riscv64-unknown-elf-ld -T sc_only.lds -o sc_only sc_only.o && rm sc_only.o
 # SKIP: simple
 riscv64-unknown-elf-gcc -o simple64 simple.c
 riscv64-unknown-elf-as -o sp_alignment_test.o sp_alignment_test.S && riscv64-unknown-elf-ld -o sp_alignment_test sp_alignment_test.o && rm sp_alignment_test.o
diff --git a/tests/programs/sc_only b/tests/programs/sc_only
new file mode 100755
index 00000000..96e107c7
Binary files /dev/null and b/tests/programs/sc_only differ
diff --git a/tests/programs/sc_only.S b/tests/programs/sc_only.S
new file mode 100644
index 00000000..3a638bfe
--- /dev/null
+++ b/tests/programs/sc_only.S
@@ -0,0 +1,16 @@
+.global _start
+_start:
+    la a0, n0         # a0 holds address of memory location n0
+    sc.d a3, a2, (a0)
+    beqz a3, fail     # sc.d must fail
+done:
+    li a0, 0
+    li a7, 93
+    ecall
+fail:
+    li a0, 1
+    li a7, 93
+    ecall
+.section .data
+n0:
+    .dword 4      # Initialize to 4
diff --git a/tests/programs/sc_only.lds b/tests/programs/sc_only.lds
new file mode 100644
index 00000000..fdfa58fb
--- /dev/null
+++ b/tests/programs/sc_only.lds
@@ -0,0 +1,7 @@
+SECTIONS
+{
+. = 0x100b0;
+.text : { *(.text) }
+. = 0x11000;
+.data : { *(.data) }
+}
diff --git a/tests/test_a_extension.rs b/tests/test_a_extension.rs
index d6fa9a42..99073492 100644
--- a/tests/test_a_extension.rs
+++ b/tests/test_a_extension.rs
@@ -33,6 +33,22 @@ pub fn test_sc_after_sc() {
     }
 }
 
+#[test]
+pub fn test_sc_only() {
+    let mut machine = machine_build::int_v2_imacb("tests/programs/sc_only");
+    let ret = machine.run();
+    assert!(ret.is_ok());
+    assert_eq!(ret.unwrap(), 0);
+
+    #[cfg(has_asm)]
+    {
+        let mut machine_asm = machine_build::asm_v2_imacb("tests/programs/sc_only");
+        let ret_asm = machine_asm.run();
+        assert!(ret_asm.is_ok());
+        assert_eq!(ret_asm.unwrap(), 0);
+    }
+}
+
 #[test]
 pub fn test_amo_compare() {
     let mut machine = machine_build::int_v2_imacb("tests/programs/amo_compare");