diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 88c49eee..c13694fc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -131,11 +131,15 @@ jobs:
           jobs="gcc/debug gcc/release clang/debug clang/release"
           echo "===== parallel jobs: $jobs"
           parallel -kv --lb 'cd build/extra/{} && bash ../../../../misc/testsuite/mimic_ctest_sigsegv.sh' ::: $jobs
+          ls -ld ./build/*/*/*/upx-* || true
+          rm -rf ./build/*/*/*/upx-*
       - name: Run ctest tests
         run: |
           jobs="gcc/debug gcc/release clang/debug clang/release"
           echo "===== parallel jobs: $jobs"
           CTEST_JOBS=2 parallel -kv --lb 'make build/extra/{}+test' ::: $jobs
+          ls -ld ./build/*/*/*/XTesting/*/* || true
+          rm -rf ./build/*/*/*/XTesting/*/*
       - name: Mimic ctest tests with Valgrind
         run: |
           export UPX_CONFIG_DISABLE_EXHAUSTIVE_TESTS=ON # valgrind is SLOW
@@ -240,6 +244,8 @@ jobs:
           test "${{ matrix.use_extra }}" = "true" && jobs="$jobs gcc-m32/debug gcc-m32/release"
           echo "===== parallel jobs: $jobs"
           parallel -kv --lb 'cd build/extra/{} && bash ../../../../misc/testsuite/mimic_ctest_sigsegv.sh' ::: $jobs
+          ls -ld ./build/*/*/*/upx-* || true
+          rm -rf ./build/*/*/*/upx-*
       - name: Run ctest tests
         run: |
           jobs="gcc/debug gcc/release clang/debug clang/release"
@@ -248,6 +254,8 @@ jobs:
           command -v wine >/dev/null && jobs="$jobs cross-windows-mingw64/debug cross-windows-mingw64/release"
           echo "===== parallel jobs: $jobs"
           CTEST_JOBS=2 parallel -kv --lb 'make build/extra/{}+test' ::: $jobs
+          ls -ld ./build/*/*/*/XTesting/*/* || true
+          rm -rf ./build/*/*/*/XTesting/*/*
       - name: Mimic ctest tests with Valgrind
         if: true # note: valgrind is SLOW
         run: |