prepare to enable ubsan in continuous build

Makefile

@@ -187,8 +187,8 @@ CC_ubsan = clang
 CXX_ubsan = clang++
 LD_ubsan = clang
 LDXX_ubsan = clang++
-CPPFLAGS_ubsan = -O1 -fsanitize-coverage=edge -fsanitize=undefined -fno-omit-frame-pointer -Wno-unused-command-line-argument
-LDFLAGS_ubsan = -fsanitize=undefined
+CPPFLAGS_ubsan = -O0 -fsanitize-coverage=edge -fsanitize=undefined,unsigned-integer-overflow -fno-omit-frame-pointer -Wno-unused-command-line-argument -Wvarargs
+LDFLAGS_ubsan = -fsanitize=undefined,unsigned-integer-overflow
 DEFINES_ubsan = NDEBUG
 DEFINES_ubsan += GRPC_TEST_SLOWDOWN_BUILD_FACTOR=1.5
 

build.yaml

@@ -3255,14 +3255,16 @@ configs:
     timeout_multiplier: 5
   ubsan:
     CC: clang
-    CPPFLAGS: -O1 -fsanitize-coverage=edge -fsanitize=undefined -fno-omit-frame-pointer
-      -Wno-unused-command-line-argument
+    CPPFLAGS: -O0 -fsanitize-coverage=edge -fsanitize=undefined,unsigned-integer-overflow
+      -fno-omit-frame-pointer -Wno-unused-command-line-argument -Wvarargs
     CXX: clang++
     DEFINES: NDEBUG
     LD: clang
-    LDFLAGS: -fsanitize=undefined
+    LDFLAGS: -fsanitize=undefined,unsigned-integer-overflow
     LDXX: clang++
     compile_the_world: true
+    test_environ:
+      UBSAN_OPTIONS: print_stacktrace=1
     timeout_multiplier: 1.5
 defaults:
   boringssl:

tools/run_tests/configs.json

@@ -56,6 +56,9 @@
   }, 
   {
     "config": "ubsan", 
+    "environ": {
+      "UBSAN_OPTIONS": "print_stacktrace=1"
+    }, 
     "timeout_multiplier": 1.5
   }, 
   {

tools/run_tests/dockerize/docker_run_tests.sh

@@ -35,6 +35,7 @@ set -e
 
 export CONFIG=$config
 export ASAN_SYMBOLIZER_PATH=/usr/bin/llvm-symbolizer
+export PATH=$PATH:/usr/bin/llvm-symbolizer
 
 # Ensure that programs depending on current-user-ownership of cache directories
 # are satisfied (it's being mounted from outside the image).