//test/integration:tcp_tunneling_integration_test flakes after custom inline header changes

[alyssawilk]

no logs on CI because we hit the UI limit but looks like the changes to custom inline headers did something to tsan and I suspect it's the cause of the (logless) asan flakes on CI

git checkout ec19828
bazel test --config=remote --config=clang-tsan //test/integration:tcp_tunneling_integration_test --runs_per_test=3
Executed 1 out of 1 test: 1 test passes.

git checkout f4a9e23
bazel test --config=remote --config=clang-tsan //test/integration:tcp_tunneling_integration_test --runs_per_test=3
//test/integration:tcp_tunneling_integration_test FAILED in 25 out of 90 in 204.0s

WARNING: ThreadSanitizer: data race on vptr (ctor/dtor vs virtual call) (pid=18)
Write of size 8 at 0x7b440001c840 by main thread:
#0 Envoy::Http::HeaderMapImpl::~HeaderMapImpl() (tcp_tunneling_integration_test+0x3456a34)
#1 Envoy::Http::TypedHeaderMapImplEnvoy::Http::ResponseHeaderMap::~TypedHeaderMapImpl() (tcp_tunneling_integration_test+0x34f5c96)
#2 Envoy::Http::ResponseHeaderMapImpl::~ResponseHeaderMapImpl() (tcp_tunneling_integration_test+0x34e8285)
#3 std::__1::default_deleteEnvoy::Http::ResponseHeaderMapImpl::operator()(Envoy::Http::ResponseHeaderMapImpl*) const tcp_tunneling_integration_test.cc (tcp_tunneling_integration_test+0x34f7fc3)
#4 std::__1::__shared_ptr_pointer<Envoy::Http::ResponseHeaderMapImpl*, std::__1::default_deleteEnvoy::Http::ResponseHeaderMapImpl, std::__1::allocatorEnvoy::Http::ResponseHeaderMapImpl >::__on_zero_shared() (tcp_tunneling_integration_test+0x3a9285a)
#5 std::__1::__shared_weak_count::__release_shared() memory.cpp (tcp_tunneling_integration_test+0xacbe56d)
#6 Envoy::FakeStream::encodeHeaders(Envoy::Http::HeaderMap const&, bool) (tcp_tunneling_integration_test+0x39f8794)
#7 Envoy::(anonymous namespace)::ProxyingConnectIntegrationTest_ProxyConnectWithIP_Test::TestBody() tcp_tunneling_integration_test.cc (tcp_tunneling_integration_test+0x33be593)
#8 void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::)(), char const) (tcp_tunneling_integration_test+0xac5b517)
#9 void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::)(), char const) (tcp_tunneling_integration_test+0xac408ca)
#10 testing::Test::Run() (tcp_tunneling_integration_test+0xac24098)
#11 testing::TestInfo::Run() (tcp_tunneling_integration_test+0xac24ed1)
#12 testing::TestSuite::Run() (tcp_tunneling_integration_test+0xac25a70)
#13 testing::internal::UnitTestImpl::RunAllTests() (tcp_tunneling_integration_test+0xac35aaa)
#14 bool testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::)(), char const) (tcp_tunneling_integration_test+0xac614b7)
#15 bool testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::)(), char const) (tcp_tunneling_integration_test+0xac4418a)
#16 testing::UnitTest::Run() (tcp_tunneling_integration_test+0xac3536d)
#17 RUN_ALL_TESTS() (tcp_tunneling_integration_test+0x8431ca7)
#18 Envoy::TestRunner::runTests(int, char**) (tcp_tunneling_integration_test+0x8431000)
#19 main (tcp_tunneling_integration_test+0x842dd8e)

Previous read of size 8 at 0x7b440001c840 by thread T144:
#0 Envoy::Http::TypedHeaderMapImplEnvoy::Http::ResponseHeaderMap::getInline(Envoy::Http::CustomInlineHeaderRegistry::Handle<(Envoy::Http::CustomInlineHeaderRegistry::Type)2>) const (tcp_tunneling_integration_test+0x34e93f2)
#1 Envoy::Http::ResponseHeaderMapImpl::Status() const (tcp_tunneling_integration_test+0x34ed625)
#2 non-virtual thunk to Envoy::Http::ResponseHeaderMapImpl::Status() const (tcp_tunneling_integration_test+0x34f51c9)
#3 Envoy::Http::Http1::ResponseEncoderImpl::encodeHeaders(Envoy::Http::ResponseHeaderMap const&, bool) (tcp_tunneling_integration_test+0x758b81f)
#4 non-virtual thunk to Envoy::Http::Http1::ResponseEncoderImpl::encodeHeaders(Envoy::Http::ResponseHeaderMap const&, bool) (tcp_tunneling_integration_test+0x758c200)
#5 Envoy::FakeStream::encodeHeaders(Envoy::Http::HeaderMap const&, bool)::$_2::operator()() const fake_upstream.cc (tcp_tunneling_integration_test+0x3a13eb6)
#6 decltype(static_cast<Envoy::FakeStream::encodeHeaders(Envoy::Http::HeaderMap const&, bool)::$_2&>(fp)()) std::__1::__invoke<Envoy::FakeStream::encodeHeaders(Envoy::Http::HeaderMap const&, bool)::$_2&>(Envoy::FakeStream::encodeHeaders(Envoy::Http::HeaderMap const&, bool)::$_2&) fake_upstream.cc (tcp_tunneling_integration_test+0x3a13d25)
#7 void std::__1::__invoke_void_return_wrapper<void, true>::__call<Envoy::FakeStream::encodeHeaders(Envoy::Http::HeaderMap const&, bool)::$_2&>(Envoy::FakeStream::encodeHeaders(Envoy::Http::HeaderMap const&, bool)::$_2&) fake_upstream.cc (tcp_tunneling_integration_test+0x3a13c9d)