Disable PhysicalSocketTest.TestUdpReadyToSendIPv4 on linux due to flakiness on the Linux64 Debug bo…

webrtc/base/physicalsocketserver_unittest.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 198 matching lines @@
   SocketTest::TestUdpIPv6();
 }
 
 // Disable for TSan v2, see
 // https://code.google.com/p/webrtc/issues/detail?id=3498 for details.
 // Also disable for MSan, see:
 // https://code.google.com/p/webrtc/issues/detail?id=4958
 // TODO(deadbeef): Enable again once test is reimplemented to be unflaky.
 // Also disable for ASan.
 // Disabled on Android: https://code.google.com/p/webrtc/issues/detail?id=4364
+// Disabled on Linux: https://bugs.chromium.org/p/webrtc/issues/detail?id=5233
 #if defined(THREAD_SANITIZER) || defined(MEMORY_SANITIZER) || \
-  defined(ADDRESS_SANITIZER) || defined(WEBRTC_ANDROID)
+    defined(ADDRESS_SANITIZER) || defined(WEBRTC_ANDROID) ||  \
+    defined(WEBRTC_LINUX)
 #define MAYBE_TestUdpReadyToSendIPv4 DISABLED_TestUdpReadyToSendIPv4
 #else
 #define MAYBE_TestUdpReadyToSendIPv4 TestUdpReadyToSendIPv4
 #endif
 TEST_F(PhysicalSocketTest, MAYBE_TestUdpReadyToSendIPv4) {
   SocketTest::TestUdpReadyToSendIPv4();
 }
 
 TEST_F(PhysicalSocketTest, TestUdpReadyToSendIPv6) {
   SocketTest::TestUdpReadyToSendIPv6();
@@ skipping 126 matching lines @@
   thread->Start(runnable.get());
   EXPECT_TRUE(ss_->Wait(1500, true));
   EXPECT_TRUE(ExpectSignal(SIGTERM));
   EXPECT_EQ(Thread::Current(), signaled_thread_);
   EXPECT_TRUE(ExpectNone());
 }
 
 #endif
 
 }  // namespace rtc