diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index eaaf053..ad54029 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,6 +11,7 @@ env:
 
 jobs:
   linux-native:
+    timeout-minutes: 3
     runs-on: ${{ matrix.machine.os }}
     if: success() || failure()
     strategy:
@@ -46,6 +47,7 @@ jobs:
         run: cargo test --target ${{ matrix.machine.arch }}-unknown-linux-${{ matrix.libc }} --release --no-default-features
 
   linux-cross:
+    timeout-minutes: 5
     runs-on: ubuntu-latest
     if: success() || failure()
     strategy:
@@ -60,6 +62,7 @@ jobs:
           - arm-unknown-linux-musleabi
           - arm-unknown-linux-musleabihf
           - armv7-unknown-linux-gnueabihf
+          - i686-pc-windows-gnu  # runs under wine, Itanium
           - i686-unknown-linux-gnu
           - i686-unknown-linux-musl
           - loongarch64-unknown-linux-gnu
@@ -71,6 +74,7 @@ jobs:
           - riscv64gc-unknown-linux-gnu
           - s390x-unknown-linux-gnu
           - sparc64-unknown-linux-gnu
+          - x86_64-pc-windows-gnu  # runs under wine, Itanium
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -91,7 +95,59 @@ jobs:
       - name: Test without std (release)
         run: cross test --target ${{ matrix.target }} --release --no-default-features
 
+  xwin-cross:
+    timeout-minutes: 10
+    runs-on: ${{ matrix.machine.os }}
+    if: success() || failure()
+    strategy:
+      fail-fast: false
+      matrix:
+        machine:
+          - os: ubuntu-latest
+            xwin_arch: x86_64
+            arch: amd64
+            target: x86_64-pc-windows-msvc
+          - os: ubuntu-latest
+            xwin_arch: x86
+            arch: i386
+            target: i686-pc-windows-msvc
+          # XXX: Wine is hanging during initial startup on arm64???
+          # - os: ubuntu-24.04-arm
+          #   xwin_arch: aarch64
+          #   arch: arm64
+          #   target: aarch64-pc-windows-msvc
+    env:
+      XWIN_ARCH: ${{ matrix.machine.xwin_arch }}
+      WINEDEBUG: fixme+all,err+all
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install Rust
+        run: rustup update nightly && rustup default nightly && rustup target add ${{ matrix.machine.target }}
+      - name: Install cargo-xwin
+        run: cargo install --locked cargo-xwin
+      - name: Install wine
+        run: |
+          set -exuo pipefail
+          sudo dpkg --add-architecture ${{ matrix.machine.arch }}
+          sudo apt-get update
+          sudo apt install wine:${{ matrix.machine.arch }}
+          wineboot
+      - name: Test with panic backend (debug)
+        run: LITHIUM_BACKEND=panic cargo xwin test --target ${{ matrix.machine.target }}
+      - name: Test with SEH backend (debug)
+        run: LITHIUM_BACKEND=seh cargo xwin test --target ${{ matrix.machine.target }}
+      - name: Test without std (debug)
+        run: cargo xwin test --target ${{ matrix.machine.target }} --no-default-features
+      - name: Test with panic backend (release)
+        run: LITHIUM_BACKEND=panic cargo xwin test --target ${{ matrix.machine.target }} --release
+      - name: Test with SEH backend (release)
+        run: LITHIUM_BACKEND=seh cargo xwin test --target ${{ matrix.machine.target }} --release
+      - name: Test without std (release)
+        run: cargo xwin test --target ${{ matrix.machine.target }} --release --no-default-features
+
   emscripten:
+    timeout-minutes: 5
     runs-on: ubuntu-latest
     if: success() || failure()
     steps:
@@ -111,6 +167,7 @@ jobs:
         run: LITHIUM_BACKEND=emscripten cross test --target wasm32-unknown-emscripten --release
 
   wasi:
+    timeout-minutes: 3
     runs-on: ubuntu-latest
     if: success() || failure()
     steps:
@@ -141,6 +198,7 @@ jobs:
       #   run: ci/cargo-wasi test --target wasm32-wasip1 --release --no-default-features
 
   darwin:
+    timeout-minutes: 3
     runs-on: ${{ matrix.os }}
     if: success() || failure()
     strategy:
@@ -168,6 +226,7 @@ jobs:
         run: cargo test --release
 
   windows:
+    timeout-minutes: 5
     runs-on: windows-latest
     if: success() || failure()
     strategy:
@@ -191,7 +250,6 @@ jobs:
         if: matrix.abi == 'gnu'
         run: set LITHIUM_BACKEND=itanium && cargo test
       - name: Test without std (debug)
-        if: matrix.abi == 'msvc'
         run: cargo test --no-default-features
       - name: Test with panic backend (release)
         run: set LITHIUM_BACKEND=panic && cargo test --release
@@ -202,10 +260,10 @@ jobs:
         if: matrix.abi == 'gnu'
         run: set LITHIUM_BACKEND=itanium && cargo test --release
       - name: Test without std (release)
-        if: matrix.abi == 'msvc'
         run: cargo test --release --no-default-features
 
   miri-linux:
+    timeout-minutes: 5
     runs-on: ubuntu-latest
     if: success() || failure()
     strategy:
@@ -232,6 +290,7 @@ jobs:
         run: cargo miri test --target ${{ matrix.target }} --no-default-features
 
   valgrind:
+    timeout-minutes: 5
     runs-on: ubuntu-latest
     env:
       RUSTC_BOOTSTRAP: '1'
@@ -259,6 +318,7 @@ jobs:
         run: cargo valgrind test --release --no-default-features
 
   test-stable:
+    timeout-minutes: 3
     runs-on: ubuntu-latest
     if: success() || failure()
     steps:
@@ -272,6 +332,7 @@ jobs:
         run: cargo test --release
 
   lint:
+    timeout-minutes: 1
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false