diff --git a/.github/workflows/stdarch.yml b/.github/workflows/stdarch.yml
index d8818eefa96..5a33382220e 100644
--- a/.github/workflows/stdarch.yml
+++ b/.github/workflows/stdarch.yml
@@ -34,7 +34,7 @@ jobs:
       uses: Swatinem/rust-cache@v2
 
     - name: Install packages
-      run: sudo apt-get install ninja-build ripgrep
+      run: sudo apt-get install ninja-build ripgrep valgrind
 
     # TODO: remove when we have binutils version 2.43 in the repo.
     - name: Install more recent binutils
@@ -91,7 +91,8 @@ jobs:
     - name: Run tests
       if: ${{ !matrix.cargo_runner }}
       run: |
-        ./y.sh test --release --clean --release-sysroot --build-sysroot --mini-tests --std-tests --test-libcore
+        ./y.sh test --release --clean --release-sysroot --build-sysroot --mini-tests --std-tests --test-libcore || true
+        valgrind /home/runner/work/rustc_codegen_gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/tests/target/debug/deps/coretests-0eb5c3b3aa55650b
 
     - name: Run stdarch tests
       if: ${{ !matrix.cargo_runner }}
diff --git a/build_system/src/test.rs b/build_system/src/test.rs
index 371fcb4bc30..7a287645751 100644
--- a/build_system/src/test.rs
+++ b/build_system/src/test.rs
@@ -1052,7 +1052,7 @@ where
             &"always",
             &"--stage",
             &"0",
-            &format!("tests/{}", test_type),
+            &format!("tests/ui/lto/fat-lto.rs"),
             &"--compiletest-rustc-args",
             &rustc_args,
         ],