diff --git a/contrib/teamcity/build-configurations.py b/contrib/teamcity/build-configurations.py
--- a/contrib/teamcity/build-configurations.py
+++ b/contrib/teamcity/build-configurations.py
@@ -187,7 +187,13 @@
         generator = self.config.get("generator", {})
         generator_name = generator.get("name", "Ninja")
         generator_command = generator.get("command", "ninja")
-        generator_flags = generator.get("flags", ["-k0"])
+        # If the build runs on diff or has the fail_fast flag, exit on first error.
+        # Otherwise keep running so we can gather more test result.
+        fail_fast = self.config.get(
+            "fail_fast", False) or self.config.get(
+            "runOnDiff", False)
+        generator_flags = generator.get(
+            "flags", ["-k0"] if not fail_fast else [])
 
         # Max out the jobs by default when the generator uses make
         if generator_command == "make":
diff --git a/contrib/teamcity/build-configurations.yml b/contrib/teamcity/build-configurations.yml
--- a/contrib/teamcity/build-configurations.yml
+++ b/contrib/teamcity/build-configurations.yml
@@ -39,6 +39,7 @@
   build-asan:
     Werror: true
     clang: true
+    fail_fast: true
     cmake_flags:
       - '-DCMAKE_CXX_FLAGS=-DARENA_DEBUG'
       - '-DCRYPTO_USE_ASM=OFF'
@@ -289,6 +290,7 @@
   build-tsan:
     Werror: true
     clang: true
+    fail_fast: true
     cmake_flags:
       - '-DENABLE_SANITIZERS=thread'
     targets:
@@ -303,6 +305,7 @@
   build-ubsan:
     Werror: true
     clang: true
+    fail_fast: true
     cmake_flags:
       - '-DENABLE_SANITIZERS=undefined'
     templates: