https://logs.chromium.org/v/?s=chromium%2Fbb%2Fchromium.memory%2FLinux_ChromiumOS_MSan_Tests%2F6228%2F%2B%2Frecipes%2Fsteps%2Fbrowser_tests%2F0%2Flogs%2FPageLoadMetricsBrowserTest.NoPaintForEmptyDocument%2F0

LogDog : chromium/bb/chromium.memory/Linux_ChromiumOS_MSan_Tests/6228/+/recipes/steps/browser_tests/0/logs/PageLoadMetricsBrowserTest.NoPaintForEmptyDocument/0  crouleau@google.com | Sign out
 [ RUN      ] PageLoadMetricsBrowserTest.NoPaintForEmptyDocument
[27944:27944:0315/020126.517862:WARNING:chrome_browser_main_chromeos.cc(614)] Running as stub user with profile dir: test-user
==27944==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x1d62a0f1 in ui::ws::DisplayManager::DisplayManager(ui::ws::WindowServer*) ./../../services/ui/ws/display_manager.cc:44:7
    #1 0x1d66ba0d in make_unique<ui::ws::DisplayManager, ui::ws::WindowServer *> ./../../buildtools/third_party/libc++/trunk/include/memory:3079:32
    #2 0x1d66ba0d in ui::ws::WindowServer::WindowServer(ui::ws::WindowServerDelegate*, bool) ./../../services/ui/ws/window_server.cc:138:0
    #3 0xd31d8e5 in make_unique<ui::ws::WindowServer, ui::Service *, const bool &> ./../../buildtools/third_party/libc++/trunk/include/memory:3079:32
    #4 0xd31d8e5 in ui::Service::OnStart() ./../../services/ui/service.cc:261:0
    #5 0x1520fb2e in service_manager::ServiceContext::OnStart(service_manager::Identity const&, base::OnceCallback<void (mojo::InterfaceRequest<service_manager::mojom::Connector>, mojo::AssociatedInterfaceRequest<service_manager::mojom::ServiceControl>)>) ./../../services/service_manager/public/cpp/service_context.cc:130:13
    #6 0x177d292d in service_manager::mojom::ServiceStubDispatch::AcceptWithResponder(service_manager::mojom::Service*, mojo::Message*, std::__1::unique_ptr<mojo::MessageReceiverWithStatus, std::__1::default_delete<mojo::MessageReceiverWithStatus> >) ./gen/services/service_manager/public/mojom/service.mojom.cc:483:13
    #7 0x1521399b in service_manager::mojom::ServiceStub<mojo::RawPtrImplRefTraits<service_manager::mojom::Service> >::AcceptWithResponder(mojo::Message*, std::__1::unique_ptr<mojo::MessageReceiverWithStatus, std::__1::default_delete<mojo::MessageReceiverWithStatus> >) ./gen/services/service_manager/public/mojom/service.mojom.h:174:12
    #8 0x172ebdee in mojo::InterfaceEndpointClient::HandleValidatedMessage(mojo::Message*) ./../../mojo/public/cpp/bindings/lib/interface_endpoint_client.cc:394:34
    #9 0x172e9c5a in mojo::FilterChain::Accept(mojo::Message*) ./../../mojo/public/cpp/bindings/lib/filter_chain.cc:40:17
    #10 0x17304386 in mojo::internal::MultiplexRouter::ProcessIncomingMessage(mojo::internal::MultiplexRouter::MessageWrapper*, mojo::internal::MultiplexRouter::ClientCallBehavior, base::SequencedTaskRunner*) ./../../mojo/public/cpp/bindings/lib/multiplex_router.cc:880:42
    #11 0x17301be6 in mojo::internal::MultiplexRouter::Accept(mojo::Message*) ./../../mojo/public/cpp/bindings/lib/multiplex_router.cc:604:38
    #12 0x172e9c5a in mojo::FilterChain::Accept(mojo::Message*) ./../../mojo/public/cpp/bindings/lib/filter_chain.cc:40:17
    #13 0x172e3445 in mojo::Connector::ReadSingleMessage(unsigned int*) ./../../mojo/public/cpp/bindings/lib/connector.cc:445:51
    #14 0x172e597b in mojo::Connector::ReadAllAvailableMessages() ./../../mojo/public/cpp/bindings/lib/connector.cc:474:10
    #15 0x172d10ec in Run ./../../base/callback.h:124:12
    #16 0x172d10ec in mojo::SimpleWatcher::OnHandleReady(int, unsigned int, mojo::HandleSignalsState const&) ./../../mojo/public/cpp/system/simple_watcher.cc:273:0
    #17 0x123557e5 in Run ./../../base/callback.h:95:12
    #18 0x123557e5 in base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) ./../../base/debug/task_annotator.cc:61:0
    #19 0x123ea455 in base::MessageLoop::RunTask(base::PendingTask*) ./../../base/message_loop/message_loop.cc:395:25
    #20 0x123ebeef in DeferOrRunPendingTask ./../../base/message_loop/message_loop.cc:407:5
    #21 0x123ebeef in base::MessageLoop::DoWork() ./../../base/message_loop/message_loop.cc:451:0
    #22 0x123f3a23 in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) ./../../base/message_loop/message_pump_libevent.cc:220:31
    #23 0x124b938f in base::RunLoop::Run() ./../../base/run_loop.cc:133:14
    #24 0x1258b6b8 in base::Thread::ThreadMain() ./../../base/threading/thread.cc:338:3
    #25 0x1258123a in base::(anonymous namespace)::ThreadFunc(void*) ./../../base/threading/platform_thread_posix.cc:76:13
    #26 0x7fde66a35183 in start_thread /build/eglibc-SvCtMH/eglibc-2.19/nptl/pthread_create.c:312:0
    #27 0x7fde61612ffc in clone /build/eglibc-SvCtMH/eglibc-2.19/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:111:0
  Uninitialized value was created by a heap allocation
    #0 0xa81d19 in operator new(unsigned long) /b/build/slave/linux_upload_clang/build/src/third_party/llvm/compiler-rt/lib/msan/msan_new_delete.cc:45:35
    #1 0xd31d884 in make_unique<ui::ws::WindowServer, ui::Service *, const bool &> ./../../buildtools/third_party/libc++/trunk/include/memory:3079:28
    #2 0xd31d884 in ui::Service::OnStart() ./../../services/ui/service.cc:261:0
    #3 0x1520fb2e in service_manager::ServiceContext::OnStart(service_manager::Identity const&, base::OnceCallback<void (mojo::InterfaceRequest<service_manager::mojom::Connector>, mojo::AssociatedInterfaceRequest<service_manager::mojom::ServiceControl>)>) ./../../services/service_manager/public/cpp/service_context.cc:130:13
    #4 0x177d292d in service_manager::mojom::ServiceStubDispatch::AcceptWithResponder(service_manager::mojom::Service*, mojo::Message*, std::__1::unique_ptr<mojo::MessageReceiverWithStatus, std::__1::default_delete<mojo::MessageReceiverWithStatus> >) ./gen/services/service_manager/public/mojom/service.mojom.cc:483:13
    #5 0x1521399b in service_manager::mojom::ServiceStub<mojo::RawPtrImplRefTraits<service_manager::mojom::Service> >::AcceptWithResponder(mojo::Message*, std::__1::unique_ptr<mojo::MessageReceiverWithStatus, std::__1::default_delete<mojo::MessageReceiverWithStatus> >) ./gen/services/service_manager/public/mojom/service.mojom.h:174:12
    #6 0x172ebdee in mojo::InterfaceEndpointClient::HandleValidatedMessage(mojo::Message*) ./../../mojo/public/cpp/bindings/lib/interface_endpoint_client.cc:394:34
    #7 0x172e9c5a in mojo::FilterChain::Accept(mojo::Message*) ./../../mojo/public/cpp/bindings/lib/filter_chain.cc:40:17
    #8 0x17304386 in mojo::internal::MultiplexRouter::ProcessIncomingMessage(mojo::internal::MultiplexRouter::MessageWrapper*, mojo::internal::MultiplexRouter::ClientCallBehavior, base::SequencedTaskRunner*) ./../../mojo/public/cpp/bindings/lib/multiplex_router.cc:880:42
    #9 0x17301be6 in mojo::internal::MultiplexRouter::Accept(mojo::Message*) ./../../mojo/public/cpp/bindings/lib/multiplex_router.cc:604:38
    #10 0x172e9c5a in mojo::FilterChain::Accept(mojo::Message*) ./../../mojo/public/cpp/bindings/lib/filter_chain.cc:40:17
    #11 0x172e3445 in mojo::Connector::ReadSingleMessage(unsigned int*) ./../../mojo/public/cpp/bindings/lib/connector.cc:445:51
    #12 0x172e597b in mojo::Connector::ReadAllAvailableMessages() ./../../mojo/public/cpp/bindings/lib/connector.cc:474:10
    #13 0x172d10ec in Run ./../../base/callback.h:124:12
    #14 0x172d10ec in mojo::SimpleWatcher::OnHandleReady(int, unsigned int, mojo::HandleSignalsState const&) ./../../mojo/public/cpp/system/simple_watcher.cc:273:0
    #15 0x123557e5 in Run ./../../base/callback.h:95:12
    #16 0x123557e5 in base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) ./../../base/debug/task_annotator.cc:61:0
    #17 0x123ea455 in base::MessageLoop::RunTask(base::PendingTask*) ./../../base/message_loop/message_loop.cc:395:25
    #18 0x123ebeef in DeferOrRunPendingTask ./../../base/message_loop/message_loop.cc:407:5
    #19 0x123ebeef in base::MessageLoop::DoWork() ./../../base/message_loop/message_loop.cc:451:0
    #20 0x123f3a23 in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) ./../../base/message_loop/message_pump_libevent.cc:220:31
    #21 0x124b938f in base::RunLoop::Run() ./../../base/run_loop.cc:133:14
    #22 0x1258b6b8 in base::Thread::ThreadMain() ./../../base/threading/thread.cc:338:3
    #23 0x1258123a in base::(anonymous namespace)::ThreadFunc(void*) ./../../base/threading/platform_thread_posix.cc:76:13
SUMMARY: MemorySanitizer: use-of-uninitialized-value (/b/s/w/ir/out/Release/browser_tests+0x1d62a0f1)
Exiting

blame log is in here: https://ci.chromium.org/buildbot/chromium.memory/Linux%20ChromiumOS%20MSan%20Tests/6221
but I have no idea.

Is this possibly related to  bug 822246 ?