diff --git a/.github/workflows/ubuntu-ci-x86_64-gnu.yaml b/.github/workflows/ubuntu-ci-x86_64-gnu.yaml
index 59e4d273a..0a8a2c30d 100644
--- a/.github/workflows/ubuntu-ci-x86_64-gnu.yaml
+++ b/.github/workflows/ubuntu-ci-x86_64-gnu.yaml
@@ -197,6 +197,14 @@ jobs:
           spack stack create env --name chaintest3 --upstream ${SPACK_STACK_DIR}/envs/chaintest/install 2> stderr.txt
           cnt=$(grep -c "WARNING.*do not match" stderr.txt || true)
           echo $cnt
+          echo here
+          tail $PWD/envs/chaintest/site/packages.yaml
+          echo now here
+          tail $PWD/envs/chaintest/common/packages.yaml
+          echo right here
+          tail $PWD/envs/chaintest3/site/packages.yaml
+          echo nowhere
+          tail $PWD/envs/chaintest/common/packages.yaml
           cat stderr.txt
           if [ $cnt -ne 2 ]; then echo "Missing 'create env' warnings"; exit 1; fi