Actually, let's look at this one, which is on R63

Test: desktopui_MashLogin.
Suite: bvt-perbuild.
Chrome Version: 63.0.3218.0.
Build: link-release/R63-9960.0.0.

Unhandled BrowserConnectionGoneException: Timed out while waiting 240s
for HasBrowserFinishedLaunching..
build artifacts:
https://storage.cloud.google.com/?arg=chromeos-image-archive/link-release/R63-9960.0.0.
results log: http://ubercautotest.corp.google.com/tko/retrieve_logs.cgi?job=/results/143650790-chromeos-test/chromeos4-row5-rack13-host21/debug/.
status log: http://ubercautotest.corp.google.com/tko/retrieve_logs.cgi?job=/results/143650790-chromeos-test/chromeos4-row5-rack13-host21/status.log.
job link: http://cautotest-prod.corp.google.com/afe/#tab_id=view_job&object_id=143650790.

Kyle or Sadrul, can you find an owner for this? I would give it to Rob, but I think he's OOO.

I looked at 3 stacks, on the boards link and tricky. (Crashes in the lab are now symbolized! No more minidump_stackwalk!)

All 3 crashed in ui::DrmThreadProxy::AddBindingDrmDevice()

Operating system: Linux
CPU: amd64

GPU: UNKNOWN

Crash reason:  SIGSEGV
Crash address: 0x0
Process uptime: not available

Thread 0 (crashed)
 0  chrome!base::subtle::RefCountedThreadSafeBase::AddRef() const [task_runner.cc : 44 + 0x0]
 1  chrome!ui::DrmThreadProxy::AddBindingDrmDevice(mojo::InterfaceRequest<ui::ozone::mojom::DrmDevice>) [drm_thread_proxy.cc : 80 + 0xf]
 2  chrome!ui::(anonymous namespace)::OzonePlatformGbm::CreateDrmDeviceBinding(mojo::InterfaceRequest<ui::ozone::mojom::DrmDevice>, service_manager::BindSourceInfo const&) [ozone_platform_gbm.cc : 139 + 0x8]
 3  chrome!base::internal::Invoker<base::internal::BindState<void (ui::(anonymous namespace)::OzonePlatformGbm::*)(mojo::InterfaceRequest<ui::ozone::mojom::DeviceCursor>, service_manager::BindSourceInfo const&), base::WeakPtr<ui::(anonymous namespace)::OzonePlatformGbm> >, void (mojo::InterfaceRequest<ui::ozone::mojom::DeviceCursor>, service_manager::BindSourceInfo const&)>::Run(base::internal::BindStateBase*, mojo::InterfaceRequest<ui::ozone::mojom::DeviceCursor>&&, service_manager::BindSourceInfo const&) [bind_internal.h : 194 + 0x3]
 4  chrome!service_manager::CallbackBinder<catalog::mojom::Catalog, service_manager::BindSourceInfo const&>::BindInterface(std::string const&, mojo::ScopedHandleBase<mojo::MessagePipeHandle>, service_manager::BindSourceInfo const&) [callback.h : 92 + 0x6]
 5  chrome!service_manager::BinderRegistryWithArgs<content::RenderFrameHost*>::BindInterface(std::string const&, mojo::ScopedHandleBase<mojo::MessagePipeHandle>, content::RenderFrameHost*) [binder_registry.h : 86 + 0x8]
 6  chrome!ui::Service::OnBindInterface(service_manager::BindSourceInfo const&, std::string const&, mojo::ScopedHandleBase<mojo::MessagePipeHandle>) [binder_registry.h : 103 + 0xe]
 7  chrome!service_manager::ServiceContext::OnBindInterface(service_manager::BindSourceInfo const&, std::string const&, mojo::ScopedHandleBase<mojo::MessagePipeHandle>, base::OnceCallback<void ()>) [service_context.cc : 143 + 0x9]
 8  chrome!service_manager::mojom::ServiceStubDispatch::AcceptWithResponder(service_manager::mojom::Service*, mojo::Message*, std::unique_ptr<mojo::MessageReceiverWithStatus, std::default_delete<mojo::MessageReceiverWithStatus> >) [service.mojom.cc : 463 + 0x9]
 9  chrome!service_manager::mojom::ServiceStub<mojo::RawPtrImplRefTraits<service_manager::mojom::Service> >::AcceptWithResponder(mojo::Message*, std::unique_ptr<mojo::MessageReceiverWithStatus, std::default_delete<mojo::MessageReceiverWithStatus> >) [service.mojom.h : 154 + 0x5]
10  chrome!mojo::InterfaceEndpointClient::HandleValidatedMessage(mojo::Message*) [interface_endpoint_client.cc : 393 + 0x5]
11  chrome!mojo::internal::MultiplexRouter::ProcessIncomingMessage(mojo::internal::MultiplexRouter::MessageWrapper*, mojo::internal::MultiplexRouter::ClientCallBehavior, base::SequencedTaskRunner*) [multiplex_router.cc : 885 + 0x8]
12  chrome!mojo::internal::MultiplexRouter::Accept(mojo::Message*) [multiplex_router.cc : 609 + 0xb]
13  chrome!mojo::Connector::ReadSingleMessage(unsigned int*) [connector.cc : 440 + 0xd]
14  chrome!mojo::Connector::ReadAllAvailableMessages() [connector.cc : 469 + 0xb]
15  chrome!(anonymous namespace)::OnCopyFileLocalError(base::RepeatingCallback<void (base::File::Error)> const&, base::File::Error) + 0x22
16  chrome!mojo::SimpleWatcher::OnHandleReady(int, unsigned int, mojo::HandleSignalsState const&) [callback.h : 92 + 0x6]
17  chrome!base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) [callback.h : 64 + 0x3]
18  chrome!base::MessageLoop::RunTask(base::PendingTask*) [message_loop.cc : 406 + 0x8]
19  chrome!base::MessageLoop::DoWork() [message_loop.cc : 417 + 0xb]
20  chrome!base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) [message_pump_libevent.cc : 220 + 0x9]
21  chrome!mojo::internal::ArrayDataTraits<mojo::internal::Pointer<ash::mojom::internal::MenuItem_Data> >::GetStorageSize(unsigned int) [run_loop.cc : 118 + 0x5]
22  chrome!base::internal::Invoker<base::internal::BindState<service_manager::(anonymous namespace)::RunService(service_manager::MainDelegate*)::$_0, service_manager::MainDelegate*, int*>, void (mojo::InterfaceRequest<service_manager::mojom::Service>)>::Run(base::internal::BindStateBase*, mojo::InterfaceRequest<service_manager::mojom::Service>&&) [main.cc : 313 + 0x8]
23  chrome!service_manager::RunStandaloneService(base::RepeatingCallback<void (mojo::InterfaceRequest<service_manager::mojom::Service>)> const&) [callback.h : 92 + 0x6]
24  chrome!service_manager::Main(service_manager::MainParams const&) [main.cc : 285 + 0x8]
25  chrome!content::ContentMain(content::ContentMainParams const&) [content_main.cc : 19 + 0x8]
26  chrome!ChromeMain [chrome_main.cc : 122 + 0x5]
27  libc-2.23.so!__libc_start_main [libc-start.c : 289 + 0x1a]
28  chrome!_start + 0x29
29  0x7ffc4eae3068

Thread 1
 0  libc-2.23.so!__strncasecmp_l_avx + 0xd
 1  libxkbcommon.so.0.0.0!gettok [scanner-utils.h : 133 + 0xd]
 2  libxkbcommon.so.0.0.0!xkb_components_from_rules [rules.c : 904 + 0x8]
 3  libxkbcommon.so.0.0.0!text_v1_keymap_new_from_names [xkbcomp.c : 66 + 0x8]
 4  libxkbcommon.so.0.0.0!xkb_keymap_new_from_names [keymap.c : 148 + 0x9]
 5  chrome!ui::(anonymous namespace)::LoadKeymap(std::string const&, scoped_refptr<base::SingleThreadTaskRunner>, base::RepeatingCallback<void (std::string const&, std::unique_ptr<char, base::FreeDeleter>)> const&) [xkb_keyboard_layout_engine.cc : 628 + 0xa]
 6  chrome!base::internal::Invoker<base::internal::BindState<void (*)(base::FilePath const&, scoped_refptr<base::TaskRunner> const&, base::RepeatingCallback<void (base::FilePath const&, base::FilePath const&, std::unique_ptr<ui::DrmDeviceHandle, std::default_delete<ui::DrmDeviceHandle> >)> const&), base::FilePath, scoped_refptr<base::SingleThreadTaskRunner>, base::RepeatingCallback<void (base::FilePath const&, base::FilePath const&, std::unique_ptr<ui::DrmDeviceHandle, std::default_delete<ui::DrmDeviceHandle> >)> >, void ()>::Run(base::internal::BindStateBase*) [bind_internal.h : 149 + 0x2]
 7  chrome!base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) [callback.h : 64 + 0x3]
 8  chrome!base::internal::TaskTracker::RunOrSkipTask(std::unique_ptr<base::internal::Task, std::default_delete<base::internal::Task> >, base::internal::Sequence*, bool) [task_tracker.cc : 336 + 0xf]
 9  chrome!base::internal::TaskTrackerPosix::RunOrSkipTask(std::unique_ptr<base::internal::Task, std::default_delete<base::internal::Task> >, base::internal::Sequence*, bool) [task_tracker_posix.cc : 23 + 0x13]
10  chrome!base::internal::TaskTracker::RunNextTask(base::internal::Sequence*) [task_tracker.cc : 250 + 0x11]
11  chrome!base::internal::SchedulerWorker::Thread::ThreadMain() [scheduler_worker.cc : 73 + 0x5]
12  chrome!base::(anonymous namespace)::ThreadFunc(void*) [platform_thread_posix.cc : 75 + 0x8]
13  libpthread-2.23.so!start_thread [pthread_create.c : 333 + 0x11]
14  libc-2.23.so!clone + 0x6d

Thread 2
 0  libpthread-2.23.so!pthread_cond_timedwait + 0x128
 1  chrome!base::ConditionVariable::TimedWait(base::TimeDelta const&) [condition_variable_posix.cc : 120 + 0x8]
 2  chrome!base::WaitableEvent::TimedWaitUntil(base::TimeTicks const&) [waitable_event_posix.cc : 225 + 0x13]
 3  chrome!base::WaitableEvent::TimedWait(base::TimeDelta const&) [waitable_event_posix.cc : 165 + 0x8]
 4  chrome!base::internal::SchedulerWorker::Delegate::WaitForWork(base::WaitableEvent*) [scheduler_worker.cc : 175 + 0x8]
 5  chrome!base::internal::SchedulerWorker::Thread::ThreadMain() [scheduler_worker.cc : 42 + 0x6]
 6  chrome!base::(anonymous namespace)::ThreadFunc(void*) [platform_thread_posix.cc : 75 + 0x8]
 7  libpthread-2.23.so!start_thread [pthread_create.c : 333 + 0x11]
 8  libc-2.23.so!clone + 0x6d

Thread 3
 0  libc-2.23.so!__epoll_wait_nocancel + 0x2a
 1  chrome!epoll_dispatch [epoll.c : 198 + 0x8]
 2  chrome!event_base_loop [event.c : 512 + 0x11]
 3  chrome!base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) [message_pump_libevent.cc : 247 + 0xa]
 4  chrome!mojo::internal::ArrayDataTraits<mojo::internal::Pointer<ash::mojom::internal::MenuItem_Data> >::GetStorageSize(unsigned int) [run_loop.cc : 118 + 0x5]
 5  chrome!base::Thread::ThreadMain() [thread.cc : 338 + 0xc]
 6  chrome!base::(anonymous namespace)::ThreadFunc(void*) [platform_thread_posix.cc : 75 + 0x8]
 7  libpthread-2.23.so!start_thread [pthread_create.c : 333 + 0x11]
 8  libc-2.23.so!clone + 0x6d

Thread 4
 0  ld-2.23.so!_dl_map_object [dl-load.c : 1962 + 0x0]
 1  ld-2.23.so!dl_open_worker [dl-open.c : 226 + 0x28]
 2  ld-2.23.so!_dl_catch_error [dl-error.c : 187 + 0xd]
 3  ld-2.23.so!_dl_open [dl-open.c : 649 + 0x5]
 4  libdl-2.23.so!dlopen_doit [dlopen.c : 66 + 0x8]
 5  ld-2.23.so!_dl_catch_error [dl-error.c : 187 + 0xd]
 6  libdl-2.23.so!_dlerror_run [dlerror.c : 163 + 0x1f]
 7  libdl-2.23.so!__dlopen [dlopen.c : 87 + 0x5]
 8  chrome!base::LoadNativeLibraryWithOptions(base::FilePath const&, base::NativeLibraryOptions const&, base::NativeLibraryLoadError*) [native_library_posix.cc : 42 + 0x5]
 9  chrome!base::LoadNativeLibrary(base::FilePath const&, base::NativeLibraryLoadError*) [native_library.cc : 11 + 0x8]
10  chrome!ui::LoadDefaultEGLGLES2Bindings(gl::GLImplementation) [egl_util.cc : 29 + 0x8]
11  chrome!ui::GLOzoneEGL::InitializeStaticGLBindings(gl::GLImplementation) [gl_ozone_egl.cc : 28 + 0x6]
12  chrome!gl::init::InitializeGLOneOffImplementation(gl::GLImplementation, bool, bool, bool, bool) [gl_factory.cc : 81 + 0x5]
13  chrome!gl::init::(anonymous namespace)::InitializeGLOneOffHelper(bool) [gl_factory.cc : 58 + 0x16]
14  chrome!gl::init::InitializeGLNoExtensionsOneOff() [gl_factory.cc : 72 + 0x7]
15  chrome!gpu::GpuInit::InitializeAndStartSandbox(base::CommandLine*, bool) [gpu_init.cc : 204 + 0x5]
16  chrome!ui::GpuMain::InitOnGpuThread(scoped_refptr<base::SingleThreadTaskRunner>, scoped_refptr<base::SingleThreadTaskRunner>) [gpu_main.cc : 158 + 0x10]
17  chrome!base::internal::Invoker<base::internal::BindState<void (ui::GpuMain::*)(scoped_refptr<base::SingleThreadTaskRunner>, scoped_refptr<base::SingleThreadTaskRunner>), base::internal::UnretainedWrapper<ui::GpuMain>, scoped_refptr<base::SingleThreadTaskRunner>, scoped_refptr<base::SingleThreadTaskRunner> >, void ()>::Run(base::internal::BindStateBase*) [bind_internal.h : 194 + 0x2]
18  chrome!base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) [callback.h : 64 + 0x3]
19  chrome!base::MessageLoop::RunTask(base::PendingTask*) [message_loop.cc : 406 + 0x8]
20  chrome!base::MessageLoop::DoWork() [message_loop.cc : 417 + 0xb]
21  chrome!base::MessagePumpDefault::Run(base::MessagePump::Delegate*) [message_pump_default.cc : 33 + 0xa]
22  chrome!mojo::internal::ArrayDataTraits<mojo::internal::Pointer<ash::mojom::internal::MenuItem_Data> >::GetStorageSize(unsigned int) [run_loop.cc : 118 + 0x5]
23  chrome!base::Thread::ThreadMain() [thread.cc : 338 + 0xc]
24  chrome!base::(anonymous namespace)::ThreadFunc(void*) [platform_thread_posix.cc : 75 + 0x8]
25  libpthread-2.23.so!start_thread [pthread_create.c : 333 + 0x11]
26  libc-2.23.so!clone + 0x6d

Thread 5
 0  libc-2.23.so!clone + 0x31
 1  libpthread-2.23.so + 0x71f0

Thread 6
 0  libpthread-2.23.so!pthread_cond_timedwait + 0x128
 1  chrome!base::ConditionVariable::TimedWait(base::TimeDelta const&) [condition_variable_posix.cc : 120 + 0x8]
 2  chrome!base::WaitableEvent::TimedWaitUntil(base::TimeTicks const&) [waitable_event_posix.cc : 225 + 0x13]
 3  chrome!base::WaitableEvent::TimedWait(base::TimeDelta const&) [waitable_event_posix.cc : 165 + 0x8]
 4  chrome!base::internal::SchedulerWorker::Delegate::WaitForWork(base::WaitableEvent*) [scheduler_worker.cc : 175 + 0x8]
 5  chrome!base::internal::SchedulerWorker::Thread::ThreadMain() [scheduler_worker.cc : 42 + 0x6]
 6  chrome!base::(anonymous namespace)::ThreadFunc(void*) [platform_thread_posix.cc : 75 + 0x8]
 7  libpthread-2.23.so!start_thread [pthread_create.c : 333 + 0x11]
 8  libc-2.23.so!clone + 0x6d

Thread 7
 0  libpthread-2.23.so!pthread_cond_timedwait + 0x128
 1  chrome!base::ConditionVariable::TimedWait(base::TimeDelta const&) [condition_variable_posix.cc : 120 + 0x8]
 2  chrome!base::WaitableEvent::TimedWaitUntil(base::TimeTicks const&) [waitable_event_posix.cc : 225 + 0x13]
 3  chrome!base::WaitableEvent::TimedWait(base::TimeDelta const&) [waitable_event_posix.cc : 165 + 0x8]
 4  chrome!base::internal::SchedulerWorker::Delegate::WaitForWork(base::WaitableEvent*) [scheduler_worker.cc : 175 + 0x8]
 5  chrome!base::internal::SchedulerWorker::Thread::ThreadMain() [scheduler_worker.cc : 42 + 0x6]
 6  chrome!base::(anonymous namespace)::ThreadFunc(void*) [platform_thread_posix.cc : 75 + 0x8]
 7  libpthread-2.23.so!start_thread [pthread_create.c : 333 + 0x11]
 8  libc-2.23.so!clone + 0x6d

Thread 8
 0  libc-2.23.so!__epoll_wait_nocancel + 0x2a
 1  chrome!epoll_dispatch [epoll.c : 198 + 0x8]
 2  chrome!event_base_loop [event.c : 512 + 0x11]
 3  chrome!base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) [message_pump_libevent.cc : 247 + 0xa]
 4  chrome!mojo::internal::ArrayDataTraits<mojo::internal::Pointer<ash::mojom::internal::MenuItem_Data> >::GetStorageSize(unsigned int) [run_loop.cc : 118 + 0x5]
 5  chrome!base::Thread::ThreadMain() [thread.cc : 338 + 0xc]
 6  chrome!base::(anonymous namespace)::ThreadFunc(void*) [platform_thread_posix.cc : 75 + 0x8]
 7  libpthread-2.23.so!start_thread [pthread_create.c : 333 + 0x11]
 8  libc-2.23.so!clone + 0x6d

Thread 9
 0  libc-2.23.so!__epoll_wait_nocancel + 0x2a
 1  chrome!epoll_dispatch [epoll.c : 198 + 0x8]
 2  chrome!event_base_loop [event.c : 512 + 0x11]
 3  chrome!base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) [message_pump_libevent.cc : 247 + 0xa]
 4  chrome!mojo::internal::ArrayDataTraits<mojo::internal::Pointer<ash::mojom::internal::MenuItem_Data> >::GetStorageSize(unsigned int) [run_loop.cc : 118 + 0x5]
 5  chrome!base::Thread::ThreadMain() [thread.cc : 338 + 0xc]
 6  chrome!base::(anonymous namespace)::ThreadFunc(void*) [platform_thread_posix.cc : 75 + 0x8]
 7  libpthread-2.23.so!start_thread [pthread_create.c : 333 + 0x11]
 8  libc-2.23.so!clone + 0x6d

Thread 10
 0  libpthread-2.23.so!pthread_cond_timedwait + 0x128
 1  chrome!base::ConditionVariable::TimedWait(base::TimeDelta const&) [condition_variable_posix.cc : 120 + 0x8]
 2  chrome!base::WaitableEvent::TimedWaitUntil(base::TimeTicks const&) [waitable_event_posix.cc : 225 + 0x13]
 3  chrome!base::WaitableEvent::TimedWait(base::TimeDelta const&) [waitable_event_posix.cc : 165 + 0x8]
 4  chrome!base::internal::SchedulerWorker::Delegate::WaitForWork(base::WaitableEvent*) [scheduler_worker.cc : 175 + 0x8]
 5  chrome!base::internal::SchedulerWorker::Thread::ThreadMain() [scheduler_worker.cc : 42 + 0x6]
 6  chrome!base::(anonymous namespace)::ThreadFunc(void*) [platform_thread_posix.cc : 75 + 0x8]
 7  libpthread-2.23.so!start_thread [pthread_create.c : 333 + 0x11]
 8  libc-2.23.so!clone + 0x6d

Yep, Rob is OOO for a while. I'll try to reproduce on Monday.

It looks like there is a race between registering interfaces for the GPU thread and starting the GPU thread. I think the main issue is that GPU interfaces are registered from the WS thread. The code tries to register the GPU interfaces with the GPU thread task runner, but that task runner doesn't necessarily exist yet and might be nullptr.

Service::OnStart() does things in the following order.
1. Runs OzonePlatform::InitializeForUI() to initialize WS parts of OzonePlatform.
2. Creates ws::GpuHost. This triggers GPU thread start. OzonePlatform::InitializeForGPU() is called on the GPU thread when it starts.
3. Registers mojom interfaces with BinderRegistry. OzonePlatform::AddInterfaces() is the last one added.

If #3 happens before the GPU thread initialization has reached OzonePlatform::InitializeForGPU() then |gpu_task_runner_| is null. BinderRegistry::AddInterface() has the lovely property that task_runner==nullptr means use the current threads task runner. The endpoint for ozone::mojom::DrmDevice is in the WS thread instead of the GPU thread now and things crash.

I was able to reproduce |gpu_task_runner_| being null still when interfaces are added. I'm pretty sure that is related to the problem, but there is an extra thread hop to the DRM thread I missed. Will need to dig a bit more.

I haven't been able to reproduce a crash after many iterations of running desktopui_MashLogin. However, looking at the code/stack trace I see a couple interesting things.

The GPU thread has passed the point in GpuInit where OzonePlatform::InitializeForGPU() has run. This means that DrmThreadProxy should exist and DrmThreadProxy::StartDrmThread() will have run.

DrmThreadProxy::AddBindingDrmDevice() is being run on the WS thread instead of the GPU thread. This isn't correct and is probably the source of the problem. 
DrmThreadProxy::AddBindingDrmDevice() gets the TaskRunner for the Drm thread and then PostTasks to it. The issue is that Thread::task_runner() can only be called from the GPU thread (which owns the Thread object) or DRM thread itself.

I think the correct solution is to register GPU interfaces from the GPU thread only. Any thoughts rjkroege?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/c338a6fbf4dd60d4e8dd89e091f1ce198f3337fd

commit c338a6fbf4dd60d4e8dd89e091f1ce198f3337fd
Author: James Cook <jamescook@chromium.org>
Date: Mon Oct 02 22:53:53 2017

autotest: Disable desktopui_MashLogin on the R62 branch

It tests an experimental flag for chrome that isn't shipping in
M62. Disable it to reduce spam from a known flaky failure.

BUG= chromium:767898 
TEST=desktopui_MashLogin

Change-Id: I112a7062d6663df065ddfa1463c39b14d94fdf21
Reviewed-on: https://chromium-review.googlesource.com/696285
Tested-by: James Cook <jamescook@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>

[modify] https://crrev.com/c338a6fbf4dd60d4e8dd89e091f1ce198f3337fd/client/site_tests/desktopui_MashLogin/control

We just had a couple more instances of this:

Test: desktopui_MashLogin.
Suite: bvt-perbuild.
Chrome Version: 67.0.3381.0.
Build: nautilus-release/R67-10525.0.0.

Reason:
Unhandled BrowserConnectionGoneException: Timed out while waiting 240s
for _GetDevToolsClient..
build artifacts:
https://storage.cloud.google.com/?arg=chromeos-image-archive/nautilus-release/R67-10525.0.0.
results log: http://ubercautotest.corp.google.com/tko/retrieve_logs.cgi?job=/results/187274989-chromeos-test/chromeos2-row8-rack9-host2/debug/.

Test: desktopui_MashLogin.
Suite: bvt-perbuild.
Chrome Version: 67.0.3383.0.
Build: eve-release/R67-10530.0.0.

Reason:
Unhandled BrowserConnectionGoneException: Timed out while waiting 240s
for _GetDevToolsClient..
build artifacts:
https://storage.cloud.google.com/?arg=chromeos-image-archive/eve-release/R67-10530.0.0.
results log: http://ubercautotest.corp.google.com/tko/retrieve_logs.cgi?job=/results/187852771-chromeos-test/chromeos6-row4-rack11-host5/debug/.

Is it possible this is related to the desktopui_MusLogin crash, issue 824809?

kylechar@'s change fixed this?

Ya this should be the same issue as crbug.com/824809. It looks like desktop_MashLogin was stable for a few days after my change landed so I'm marking this as fixed.