diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 78853129..f82c33d8 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -8,93 +8,40 @@ on:
     types: [opened, reopened, synchronize]
 
 jobs:
-  tests:
-    name: Test
-    uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
-    with:
-      linux_os_versions: '["amazonlinux2023", "bookworm", "noble", "jammy", "rhel-ubi9"]'
-      linux_swift_versions: '["6.2", "nightly-main"]'
-      linux_pre_build_command: |
-        if command -v apt-get >/dev/null 2>&1 ; then # bookworm, noble, jammy
-          # Test dependencies
-          if command -v sudo &> /dev/null && [ "$EUID" -ne 0 ]; then
-            sudo apt-get update -y
-            sudo apt-get install -y procps
-          else
-            apt-get update -y
-            apt-get install -y procps
-          fi
-        elif command -v dnf >/dev/null 2>&1 ; then # amazonlinux2023, rhel-ubi9
-          dnf update -y
-
-          # Test dependencies
-          dnf install -y procps
-        fi
-      linux_exclude_swift_versions: '[{"swift_version": "6.2", "os_version": "amazonlinux2023"}]'
-      linux_static_sdk_exclude_swift_versions: '[{"swift_version": "6.2", "os_version": "amazonlinux2023"}]'
-      linux_build_command: "swift test && swift test -c release && swift test --disable-default-traits"
-      enable_freebsd_checks: true
-      freebsd_build_command: "swift test && swift test -c release && swift test --disable-default-traits"
-      windows_swift_versions: '["6.2", "nightly-main"]'
-      windows_build_command: |
-        Invoke-Program swift test
-        Invoke-Program swift test -c release
-        Invoke-Program swift test --disable-default-traits
-      enable_macos_checks: true
-      macos_xcode_versions: '["26.4"]'
-      macos_build_command: "xcrun swift test && xcrun swift test -c release && xcrun swift test --disable-default-traits"
-      enable_linux_static_sdk_build: true
-      enable_android_sdk_build: true
-      enable_android_sdk_checks: true
-      android_ndk_versions: '["r27d", "r29"]'
-      linux_static_sdk_versions: '["6.2", "nightly-main"]'
-      linux_static_sdk_build_command: |
-        for triple in aarch64-swift-linux-musl x86_64-swift-linux-musl ; do
-          swift build --swift-sdk "\$triple"
-          swift build --swift-sdk "\$triple" --disable-default-traits
-        done
-        # empty line to ignore the --swift-sdk given by swiftlang/github-workflows/.github/workflows/scripts/install-and-build-with-sdk.sh \
-
-  test_linux_kernel:
-    name: Test Linux Kernel / ${{ matrix.dist-kern }}
-    runs-on: ubuntu-latest
-    timeout-minutes: 60
-    strategy:
-      fail-fast: false
-      matrix:
-        # These are specific distro and kernel versions that the test qemu script supports from here: https://images.linuxcontainers.org
-        dist-kern: ["al2-4.18", "al2-5.10"]
-    container:
-      image: ubuntu:24.04
+  test_macos_root:
+    name: Test macOS (root)
+    runs-on: macos-26
+    timeout-minutes: 30
+    env:
+      ROOT_SUITE: SubprocessUnixRootTests
     steps:
+      - name: Remove leftover root build
+        run: sudo -n rm -rf "${GITHUB_WORKSPACE}/.build-root" || true
+
       - name: Checkout repository
         uses: actions/checkout@v7
-      - name: Run Test
-        run: bash -c './scripts/test-using-qemu.sh ${{ matrix.dist-kern }} -- swift test'
 
-  soundness:
-    name: Soundness
-    uses: swiftlang/github-workflows/.github/workflows/soundness.yml@0.0.12
-    with:
-      license_header_check_project_name: "Swift.org"
-      docs_check_enabled: false
-      format_check_enabled: true
-      unacceptable_language_check_enabled: false
-      api_breakage_check_enabled: false
+      - name: Select Xcode
+        run: sudo xcode-select -s /Applications/Xcode_26.4.app
 
-  cmake_build:
-    name: CMake Build
-    runs-on: ubuntu-latest
-    container: swiftlang/swift:nightly-noble
-    steps:
-      - name: checkout sources
-        uses: actions/checkout@v7
-      - name: Install dependencies
-        shell: bash
-        run: apt update && apt install -y cmake ninja-build
-      - name: Configure Project
-        shell: bash
-        run: cmake -G 'Ninja' -B build -S . -DCMAKE_C_COMPILER=clang -DCMAKE_Swift_COMPILER=swiftc -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=YES
-      - name: Build Project
-        shell: bash
-        run: cmake --build build
+      - name: Verify passwordless sudo
+        run: |
+          uid="$(sudo -n id -u)" || { echo "::error::passwordless sudo unavailable"; exit 1; }
+          [ "$uid" -eq 0 ] || { echo "::error::sudo did not elevate to root (uid=$uid)"; exit 1; }
+
+      - name: Build root test suite
+        run: sudo -n xcrun swift build --build-tests --scratch-path "${GITHUB_WORKSPACE}/.build-root"
+
+      - name: Discover root test suite
+        run: |
+          sudo -n xcrun swift test list --scratch-path "${GITHUB_WORKSPACE}/.build-root" > "$RUNNER_TEMP/root-list.txt"
+          count="$(grep -c "${ROOT_SUITE}/" "$RUNNER_TEMP/root-list.txt" || true)"
+          echo "discovered ${count} ${ROOT_SUITE} test(s)"
+          [ "${count:-0}" -ge 1 ] || { echo "::error::${ROOT_SUITE} not found"; cat "$RUNNER_TEMP/root-list.txt"; exit 1; }
+
+      - name: Run root test suite
+        run: sudo -n xcrun swift test --scratch-path "${GITHUB_WORKSPACE}/.build-root" --filter "$ROOT_SUITE"
+
+      - name: Clean up root test suite
+        if: always()
+        run: sudo -n rm -rf "${GITHUB_WORKSPACE}/.build-root" || true
diff --git a/Tests/SubprocessTests/UnixTests.swift b/Tests/SubprocessTests/UnixTests.swift
index 197dcaf4..5d3d6179 100644
--- a/Tests/SubprocessTests/UnixTests.swift
+++ b/Tests/SubprocessTests/UnixTests.swift
@@ -34,6 +34,13 @@ import System
 import SystemPackage
 #endif
 
+@Suite(.serialized)
+struct SubprocessUnixRootTests {
+    init() {
+        _ = globallyIgnoredSIGPIPE
+    }
+}
+
 @Suite(.serialized)
 struct SubprocessUnixTests {
     init() {
@@ -42,8 +49,7 @@ struct SubprocessUnixTests {
 }
 
 // MARK: - PlatformOption Tests
-extension SubprocessUnixTests {
-    // Run this test with sudo
+extension SubprocessUnixRootTests {
     @Test(
         .enabled(
             if: getgid() == 0,
@@ -61,7 +67,6 @@ extension SubprocessUnixTests {
         )
     }
 
-    // Run this test with sudo
     @Test(
         .enabled(
             if: getgid() == 0,
@@ -79,7 +84,6 @@ extension SubprocessUnixTests {
         )
     }
 
-    // Run this test with sudo
     @Test(
         .enabled(
             if: getgid() == 0,
@@ -107,7 +111,6 @@ extension SubprocessUnixTests {
         )
     }
 
-    // Run this test with sudo
     @Test(
         .enabled(
             if: getgid() == 0,
@@ -171,7 +174,9 @@ extension SubprocessUnixTests {
         // PGID should == PID
         #expect(match.output.pid == match.output.pgid)
     }
+}
 
+extension SubprocessUnixTests {
     @Test(
         .enabled(
             "This test requires ps (install procps package on Debian or RedHat Linux distros)",
@@ -893,7 +898,7 @@ extension SubprocessUnixTests {
 }
 
 // MARK: - Utils
-extension SubprocessUnixTests {
+extension SubprocessUnixRootTests {
     private func assertID(
         withArgument argument: String,
         platformOptions: PlatformOptions,