https://build.chromium.org/p/chromium.fyi/builders/Android%20ChromeDriver%20Tests%20%28dbg%29/builds/36314

Traceback (most recent call last):
  File "/b/build/slave/Android_ChromeDriver_Tests__dbg_/build/src/chrome/test/chromedriver/test/run_py_tests.py", line 2625, in <module>
    ChromeDriverTest.GlobalTearDown()
  File "/b/build/slave/Android_ChromeDriver_Tests__dbg_/build/src/chrome/test/chromedriver/test/run_py_tests.py", line 348, in GlobalTearDown
    forwarder.Forwarder.UnmapAllDevicePorts(ChromeDriverTest._device)
  File "/b/build/slave/Android_ChromeDriver_Tests__dbg_/build/src/third_party/catapult/devil/devil/android/forwarder.py", line 227, in UnmapAllDevicePorts
    raise HostForwarderError('\n'.join(error_msg))
devil.android.forwarder.HostForwarderError: `/b/build/slave/Android_ChromeDriver_Tests__dbg_/build/src/third_party/catapult/devil/bin/deps/linux2/x86_64/forwarder_host --adb=/b/build/slave/Android_ChromeDriver_Tests__dbg_/build/src/third_party/android_tools/sdk/platform-tools/adb --serial-id=0757a2f000599749 --unmap-all` exited with -6
[0920/073405.231050:FATAL:host_forwarder_main.cc(145)] Check failed: bytes_read > 0 (0 vs. 0)
#0 0x000000486c47 base::debug::StackTrace::StackTrace()
#1 0x0000004721c1 logging::LogMessage::~LogMessage()
#2 0x000000409113 forwarder2::(anonymous namespace)::ClientDelegate::OnDaemonReady()
#3 0x00000040a8ff forwarder2::Daemon::SpawnIfNeeded()
#4 0x000000408ab6 main
#5 0x7f8420b00ec5 __libc_start_main
#6 0x000000408569 <unknown>

Can someone please look into it?