ESAN prototype
diff --git a/build.yaml b/build.yaml
index a277539..c025b25 100644
--- a/build.yaml
+++ b/build.yaml
@@ -2724,6 +2724,9 @@
   dbg:
     CPPFLAGS: -O0
     DEFINES: _DEBUG DEBUG
+  esan:
+    CPPFLAGS: -O0
+    DEFINES: _DEBUG DEBUG GRPC_EXECUTION_CONTEXT_SANITIZER
   gcov:
     CC: gcc
     CPPFLAGS: -O0 -fprofile-arcs -ftest-coverage -Wno-return-type