diff --git a/php/ext/google/protobuf/php-upb.c b/php/ext/google/protobuf/php-upb.c
index 640e5a4beb..67b9cfebfa 100644
--- a/php/ext/google/protobuf/php-upb.c
+++ b/php/ext/google/protobuf/php-upb.c
@@ -1,6 +1,8 @@
 /* Amalgamated source file */
 #include "php-upb.h"
 
+test-xyz
+
 /*
  * This is where we define internal portability macros used across upb.
  *
diff --git a/ruby/ext/google/protobuf_c/ruby-upb.c b/ruby/ext/google/protobuf_c/ruby-upb.c
index 23be9a1249..7bf191aad2 100644
--- a/ruby/ext/google/protobuf_c/ruby-upb.c
+++ b/ruby/ext/google/protobuf_c/ruby-upb.c
@@ -1,6 +1,8 @@
 /* Amalgamated source file */
 #include "ruby-upb.h"
 
+test-xyz
+
 /*
  * This is where we define internal portability macros used across upb.
  *
diff --git a/rust/test/cpp/interop/BUILD b/rust/test/cpp/interop/BUILD
index bef220a0ad..5479e20458 100644
--- a/rust/test/cpp/interop/BUILD
+++ b/rust/test/cpp/interop/BUILD
@@ -15,6 +15,10 @@ cc_library(
 rust_test(
     name = "interop_test",
     srcs = ["main.rs"],
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = [
         ":test_utils",
         "//rust:protobuf_cpp",
diff --git a/rust/test/shared/BUILD b/rust/test/shared/BUILD
index 1ade4ce364..d8e035d2e7 100644
--- a/rust/test/shared/BUILD
+++ b/rust/test/shared/BUILD
@@ -19,6 +19,10 @@ load("@rules_rust//rust:defs.bzl", "rust_test")
 rust_test(
     name = "child_parent_upb_test",
     srcs = ["child_parent_test.rs"],
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = [
         "//rust/test:child_upb_rust_proto",
         "//rust/test:parent_upb_rust_proto",
@@ -28,6 +32,10 @@ rust_test(
 rust_test(
     name = "child_parent_cpp_test",
     srcs = ["child_parent_test.rs"],
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = [
         "//rust/test:child_cc_rust_proto",
         "//rust/test:parent_cc_rust_proto",
@@ -37,6 +45,10 @@ rust_test(
 rust_test(
     name = "package_cpp_test",
     srcs = ["package_test.rs"],
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = [
         "//rust/test:dots_in_package_cc_rust_proto",
         "//rust/test:no_package_cc_rust_proto",
@@ -47,6 +59,10 @@ rust_test(
 rust_test(
     name = "package_upb_test",
     srcs = ["package_test.rs"],
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = [
         "//rust/test:dots_in_package_upb_rust_proto",
         "//rust/test:no_package_upb_rust_proto",
@@ -57,6 +73,10 @@ rust_test(
 rust_test(
     name = "reserved_cpp_test",
     srcs = ["reserved_test.rs"],
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = [
         "//rust/test:reserved_cc_rust_proto",
         "//rust/test:unittest_cc_rust_proto",
@@ -66,6 +86,10 @@ rust_test(
 rust_test(
     name = "reserved_upb_test",
     srcs = ["reserved_test.rs"],
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = [
         "//rust/test:reserved_upb_rust_proto",
         "//rust/test:unittest_upb_rust_proto",
@@ -75,12 +99,20 @@ rust_test(
 rust_test(
     name = "nested_messages_cpp_test",
     srcs = ["nested_messages_test.rs"],
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = ["//rust/test:unittest_cc_rust_proto"],
 )
 
 rust_test(
     name = "nested_messages_upb_test",
     srcs = ["nested_messages_test.rs"],
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = ["//rust/test:unittest_upb_rust_proto"],
 )
 
@@ -90,6 +122,10 @@ rust_test(
     aliases = {
         "//rust:protobuf_cpp": "protobuf",
     },
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = [
         "//rust:protobuf_cpp",
         "//rust/test:unittest_cc_rust_proto",
@@ -102,6 +138,10 @@ rust_test(
     aliases = {
         "//rust:protobuf_upb": "protobuf",
     },
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = [
         "//rust:protobuf_upb",
         "//rust/test:unittest_upb_rust_proto",
@@ -114,6 +154,10 @@ rust_test(
     aliases = {
         "//rust:protobuf_cpp": "protobuf",
     },
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = [
         "//rust:protobuf_cpp",
         "//rust/test:unittest_proto3_cc_rust_proto",
@@ -127,6 +171,10 @@ rust_test(
     aliases = {
         "//rust:protobuf_upb": "protobuf",
     },
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = [
         "//rust:protobuf_upb",
         "//rust/test:unittest_proto3_optional_upb_rust_proto",
@@ -137,11 +185,19 @@ rust_test(
 rust_test(
     name = "serialization_upb_test",
     srcs = ["serialization_test.rs"],
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = ["//rust/test:unittest_upb_rust_proto"],
 )
 
 rust_test(
     name = "serialization_cpp_test",
     srcs = ["serialization_test.rs"],
+    tags = [
+        # TODO(b/298006932): Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
     deps = ["//rust/test:unittest_cc_rust_proto"],
 )