Reduce flakiness under gotsan runs.

TcpPortReuseMultiThread creates lots of connections which result in
a lot of goroutines in the sentry. This can cause gotsan runs to
take really long and timeout. Increasing listen backlog and
reducing number of connections should help the connections complete
faster as well as reduce the number of goroutines that gotsan needs
to track.

PiperOrigin-RevId: 284046018

test/syscalls/linux/socket_inet_loopback.cc

@@ -635,7 +635,9 @@ INSTANTIATE_TEST_SUITE_P(
 
 using SocketInetReusePortTest = ::testing::TestWithParam<TestParam>;
 
-TEST_P(SocketInetReusePortTest, TcpPortReuseMultiThread) {
+// TODO(gvisor.dev/issue/940): Remove _NoRandomSave when portHint/stack.Seed is
+// saved/restored.
+TEST_P(SocketInetReusePortTest, TcpPortReuseMultiThread_NoRandomSave) {
   auto const& param = GetParam();
 
   TestAddress const& listener = param.listener;
@@ -643,6 +645,7 @@ TEST_P(SocketInetReusePortTest, TcpPortReuseMultiThread) {
   sockaddr_storage listen_addr = listener.addr;
   sockaddr_storage conn_addr = connector.addr;
   constexpr int kThreadCount = 3;
+  constexpr int kConnectAttempts = 4096;
 
   // Create the listening socket.
   FileDescriptor listener_fds[kThreadCount];
@@ -657,7 +660,7 @@ TEST_P(SocketInetReusePortTest, TcpPortReuseMultiThread) {
     ASSERT_THAT(
         bind(fd, reinterpret_cast<sockaddr*>(&listen_addr), listener.addr_len),
         SyscallSucceeds());
-    ASSERT_THAT(listen(fd, 40), SyscallSucceeds());
+    ASSERT_THAT(listen(fd, kConnectAttempts / 3), SyscallSucceeds());
 
     // On the first bind we need to determine which port was bound.
     if (i != 0) {
@@ -676,7 +679,6 @@ TEST_P(SocketInetReusePortTest, TcpPortReuseMultiThread) {
     ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
   }
 
-  constexpr int kConnectAttempts = 10000;
   std::atomic<int> connects_received = ATOMIC_VAR_INIT(0);
   std::unique_ptr<ScopedThread> listen_thread[kThreadCount];
   int accept_counts[kThreadCount] = {};