https://github.com/protocolbuffers/protobuf/issues/8460
--- a/src/google/protobuf/any_test.cc
+++ b/src/google/protobuf/any_test.cc
@@ -63,6 +63,8 @@ TEST(AnyTest, TestPackAndUnpack) {
 }
 
 TEST(AnyTest, TestPackFromSerializationExceedsSizeLimit) {
+  // Filter out this test on 32-bit architectures.
+  if(sizeof(void*) < 8) return;
   protobuf_unittest::TestAny submessage;
   submessage.mutable_text()->resize(INT_MAX, 'a');
   protobuf_unittest::TestAny message;

https://github.com/protocolbuffers/protobuf/issues/8459
--- a/src/google/protobuf/arena_unittest.cc
+++ b/src/google/protobuf/arena_unittest.cc
@@ -1373,6 +1373,8 @@ TEST(ArenaTest, MessageLiteOnArena) {
 uint64_t Align8(uint64_t n) { return (n + 7) & -8; }
 
 TEST(ArenaTest, SpaceAllocated_and_Used) {
+  // Filter out this test on 32-bit architectures.
+  if(sizeof(void*) < 8) return;
   Arena arena_1;
   EXPECT_EQ(0, arena_1.SpaceAllocated());
   EXPECT_EQ(0, arena_1.SpaceUsed());
@@ -1453,6 +1455,8 @@ TEST(ArenaTest, Alignment) {
 }
 
 TEST(ArenaTest, BlockSizeSmallerThanAllocation) {
+  // Filter out this test on 32-bit architectures.
+  if(sizeof(void*) < 8) return;
   for (size_t i = 0; i <= 8; ++i) {
     ArenaOptions opt;
     opt.start_block_size = opt.max_block_size = i;