Dump some diagnostics as a step
diff --git a/zorg/buildbot/builders/sanitizers/buildbot_functions.sh b/zorg/buildbot/builders/sanitizers/buildbot_functions.sh
index b1be956..3eb83c1 100755
--- a/zorg/buildbot/builders/sanitizers/buildbot_functions.sh
+++ b/zorg/buildbot/builders/sanitizers/buildbot_functions.sh
@@ -1,12 +1,14 @@
 #!/usr/bin/env bash
 
-echo
-echo "How to reproduce locally: https://github.com/google/sanitizers/wiki/SanitizerBotReproduceBuild"
-echo
-
+echo @@@BUILD_STEP Prepare@@@
 uptime
 ulimit -n 100000 || true
 ulimit -a
+df -h
+ccache -s || true
+echo
+echo "How to reproduce locally: https://github.com/google/sanitizers/wiki/SanitizerBotReproduceBuild"
+echo
 
 function stage1_clobber {
   rm -rf llvm_build2_* llvm_build_* libcxx_build_* ${STAGE1_CLOBBER:-}