diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 89c8da310..cdfe1f11c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -314,8 +314,24 @@ jobs:
           path: ${{ runner.temp }}
       - name: Restore bootstrap seed
         run: tar -C "$RUNNER_TEMP" -xf "$RUNNER_TEMP/bootstrap-seed.tar"
+      # The sanitized emitter peaks near 13 GB while it emits the compiler,
+      # then clang compiles the 348 MB module under AddressSanitizer. Together
+      # they exceed the runner's 16 GB of memory, so back them with swap.
+      - name: Enlarge swap for the sanitized emitter
+        if: matrix.phase == 'rebuild-emit'
+        run: |
+          sudo swapoff -a
+          sudo rm -f /mnt/swapfile
+          sudo fallocate -l 24G /mnt/swapfile
+          sudo chmod 600 /mnt/swapfile
+          sudo mkswap /mnt/swapfile
+          sudo swapon /mnt/swapfile
+          free -h
       - name: Native bootstrap and package installation checks
-        run: node scripts/ci-native-bootstrap.mjs
+        # The instrumented emitter's recursion can exceed the default 8 MiB stack.
+        run: |
+          if [ "$SCRIPTC_BOOTSTRAP_PHASE" = rebuild-emit ]; then ulimit -s unlimited; fi
+          node scripts/ci-native-bootstrap.mjs
         env:
           SCRIPTC_BOOTSTRAP_SEED_DIRECTORY: ${{ runner.temp }}/native-bootstrap
           SCRIPTC_BOOTSTRAP_PACKAGE_DIR: ${{ runner.temp }}/native-cli-package
diff --git a/tests/harness/bootstrap-seed.test.ts b/tests/harness/bootstrap-seed.test.ts
index 08d03203e..2e8b3bad9 100644
--- a/tests/harness/bootstrap-seed.test.ts
+++ b/tests/harness/bootstrap-seed.test.ts
@@ -75,7 +75,9 @@ test("CI restores each seed only into its matching instrumented bootstrap lane",
   expect([...checkFlavors].toSorted()).toEqual(seed.strategy.matrix.flavor);
   expect(seed.env.SCRIPTC_SAN).toBe(checks.env.SCRIPTC_SAN);
   const prepare = seed.steps.find((step) => step.run === "node scripts/bootstrap-seed.mjs")!;
-  const execute = checks.steps.find((step) => step.run === "node scripts/ci-native-bootstrap.mjs")!;
+  const execute = checks.steps.find((step) =>
+    step.run?.split("\n").includes("node scripts/ci-native-bootstrap.mjs"),
+  )!;
   expect(prepare.env?.SCRIPTC_BOOTSTRAP_SEED_DIRECTORY).toBe("${{ runner.temp }}/native-bootstrap");
   expect(execute.env?.SCRIPTC_BOOTSTRAP_SEED_DIRECTORY).toBe(
     prepare.env?.SCRIPTC_BOOTSTRAP_SEED_DIRECTORY,