1. Run Chrome w/ USS 
> out/Default/chrome --enable-features=EnableSyncUSSDeviceInfo
2. Sign in
3. Sign out
4. Sign in

[49163:49163:1024/074728:FATAL:shared_model_type_processor.cc(55)] Check failed: !is_metadata_loaded_. 
#0 0x7efdba897d8e base::debug::StackTrace::StackTrace()
#1 0x7efdba9070bf logging::LogMessage::~LogMessage()
#2 0x7efdc0029fe5 syncer::SharedModelTypeProcessor::OnMetadataLoaded()
#3 0x7efdbff4d109 syncer::DeviceInfoService::OnReadAllMetadata()
#4 0x7efdbff5c0fc _ZN4base8internal13FunctorTraitsIMN6syncer17DeviceInfoServiceEFvNS2_14ModelTypeStore6ResultESt10unique_ptrINSt7__debug6vectorINS4_6RecordESaIS9_EEESt14default_deleteISB_EERKSsEvE6InvokeIRKNS_7WeakPtrIS3_EEJS5_SE_SG_EEEvSI_OT_DpOT0_
#5 0x7efdbff5c029 _ZN4base8internal12InvokeHelperILb1EvE8MakeItSoIRKMN6syncer17DeviceInfoServiceEFvNS4_14ModelTypeStore6ResultESt10unique_ptrINSt7__debug6vectorINS6_6RecordESaISB_EEESt14default_deleteISD_EERKSsERKNS_7WeakPtrIS5_EEJS7_SG_SI_EEEvOT_OT0_DpOT1_
#6 0x7efdbff5bf71 _ZN4base8internal7InvokerINS0_9BindStateIMN6syncer17DeviceInfoServiceEFvNS3_14ModelTypeStore6ResultESt10unique_ptrINSt7__debug6vectorINS5_6RecordESaISA_EEESt14default_deleteISC_EERKSsEJNS_7WeakPtrIS4_EEEEEFvS6_SF_SH_EE7RunImplIRKSJ_RKSt5tupleIJSL_EEJLm0EEEEvOT_OT0_NS_13IndexSequenceIJXspT1_EEEEOS6_OSF_SH_
#7 0x7efdbff5be83 _ZN4base8internal7InvokerINS0_9BindStateIMN6syncer17DeviceInfoServiceEFvNS3_14ModelTypeStore6ResultESt10unique_ptrINSt7__debug6vectorINS5_6RecordESaISA_EEESt14default_deleteISC_EERKSsEJNS_7WeakPtrIS4_EEEEEFvS6_SF_SH_EE3RunEPNS0_13BindStateBaseEOS6_OSF_SH_
#8 0x7efdbbfb729f base::internal::RunMixin<>::Run()
#9 0x7efdc001c63c syncer::ModelTypeStoreImpl::ReadAllMetadataDone()
#10 0x7efdc00275d3 _ZN4base8internal13FunctorTraitsIMN6syncer18ModelTypeStoreImplEFvRKNS_8CallbackIFvNS2_14ModelTypeStore6ResultESt10unique_ptrINSt7__debug6vectorINS5_6RecordESaISA_EEESt14default_deleteISC_EERKSsELNS0_8CopyModeE1ELNS0_10RepeatModeE1EEESF_SF_S7_INS9_ISsSaISsEEESD_ISP_EES6_EvE6InvokeIRKNS_7WeakPtrIS3_EEJSN_SF_SF_SR_S6_EEEvST_OT_DpOT0_
#11 0x7efdc0027400 _ZN4base8internal12InvokeHelperILb1EvE8MakeItSoIRKMN6syncer18ModelTypeStoreImplEFvRKNS_8CallbackIFvNS4_14ModelTypeStore6ResultESt10unique_ptrINSt7__debug6vectorINS7_6RecordESaISC_EEESt14default_deleteISE_EERKSsELNS0_8CopyModeE1ELNS0_10RepeatModeE1EEESH_SH_S9_INSB_ISsSaISsEEESF_ISR_EES8_ERKNS_7WeakPtrIS5_EEJSP_SH_SH_ST_S8_EEEvOT_OT0_DpOT1_
#12 0x7efdc00272fc _ZN4base8internal7InvokerINS0_9BindStateIMN6syncer18ModelTypeStoreImplEFvRKNS_8CallbackIFvNS3_14ModelTypeStore6ResultESt10unique_ptrINSt7__debug6vectorINS6_6RecordESaISB_EEESt14default_deleteISD_EERKSsELNS0_8CopyModeE1ELNS0_10RepeatModeE1EEESG_SG_S8_INSA_ISsSaISsEEESE_ISQ_EES7_EJNS_7WeakPtrIS4_EESM_NS0_13PassedWrapperISG_EESY_NSX_ISS_EEEEEFvS7_EE7RunImplIRKSU_RKSt5tupleIJSW_SM_SY_SY_SZ_EEJLm0ELm1ELm2ELm3ELm4EEEEvOT_OT0_NS_13IndexSequenceIJXspT1_EEEEOS7_
#13 0x7efdc002713c _ZN4base8internal7InvokerINS0_9BindStateIMN6syncer18ModelTypeStoreImplEFvRKNS_8CallbackIFvNS3_14ModelTypeStore6ResultESt10unique_ptrINSt7__debug6vectorINS6_6RecordESaISB_EEESt14default_deleteISD_EERKSsELNS0_8CopyModeE1ELNS0_10RepeatModeE1EEESG_SG_S8_INSA_ISsSaISsEEESE_ISQ_EES7_EJNS_7WeakPtrIS4_EESM_NS0_13PassedWrapperISG_EESY_NSX_ISS_EEEEEFvS7_EE3RunEPNS0_13BindStateBaseEOS7_
#14 0x7efdbb78f7ff base::internal::RunMixin<>::Run()
#15 0x7efdbb9204e0 base::internal::ReplyAdapter<>()
#16 0x7efdbb790f5f _ZN4base8internal13FunctorTraitsIPFvRKNS_8CallbackIFSt10unique_ptrINS_5ValueESt14default_deleteIS4_EEvELNS0_8CopyModeE1ELNS0_10RepeatModeE1EEEPS7_EvE6InvokeIJSD_RKSE_EEEvSG_DpOT_
#17 0x7efdbb920cfd _ZN4base8internal12InvokeHelperILb0EvE8MakeItSoIRKPFvRKNS_8CallbackIFviELNS0_8CopyModeE1ELNS0_10RepeatModeE1EEEPiEJSA_SB_EEEvOT_DpOT0_
#18 0x7efdc0024e28 _ZN4base8internal7InvokerINS0_9BindStateIPFvRKNS_8CallbackIFvN6syncer14ModelTypeStore6ResultEELNS0_8CopyModeE1ELNS0_10RepeatModeE1EEEPS6_EJSA_NS0_12OwnedWrapperIS6_EEEEEFvvEE7RunImplIRKSF_RKSt5tupleIJSA_SH_EEJLm0ELm1EEEEvOT_OT0_NS_13IndexSequenceIJXspT1_EEEE
#19 0x7efdc0024d3c _ZN4base8internal7InvokerINS0_9BindStateIPFvRKNS_8CallbackIFvN6syncer14ModelTypeStore6ResultEELNS0_8CopyModeE1ELNS0_10RepeatModeE1EEEPS6_EJSA_NS0_12OwnedWrapperIS6_EEEEEFvvEE3RunEPNS0_13BindStateBaseE
#20 0x7efdba86925b base::internal::RunMixin<>::Run()
#21 0x7efdbaa63a98 base::(anonymous namespace)::PostTaskAndReplyRelay::RunReplyAndSelfDestruct()
#22 0x7efdbaa63eb9 _ZN4base8internal13FunctorTraitsIMNS_12_GLOBAL__N_121PostTaskAndReplyRelayEFvvEvE6InvokeIPS3_JEEEvS5_OT_DpOT0_
#23 0x7efdbaa63dc1 _ZN4base8internal12InvokeHelperILb0EvE8MakeItSoIRKMNS_12_GLOBAL__N_121PostTaskAndReplyRelayEFvvEJPS5_EEEvOT_DpOT0_
#24 0x7efdbaa63d67 _ZN4base8internal7InvokerINS0_9BindStateIMNS_12_GLOBAL__N_121PostTaskAndReplyRelayEFvvEJNS0_17UnretainedWrapperIS4_EEEEEFvvEE7RunImplIRKS6_RKSt5tupleIJS8_EEJLm0EEEEvOT_OT0_NS_13IndexSequenceIJXspT1_EEEE
#25 0x7efdbaa63cac _ZN4base8internal7InvokerINS0_9BindStateIMNS_12_GLOBAL__N_121PostTaskAndReplyRelayEFvvEJNS0_17UnretainedWrapperIS4_EEEEEFvvEE3RunEPNS0_13BindStateBaseE
#26 0x7efdba89dc71 _ZNO4base8internal8RunMixinINS_8CallbackIFvvELNS0_8CopyModeE0ELNS0_10RepeatModeE0EEEE3RunEv
#27 0x7efdba89d679 base::debug::TaskAnnotator::RunTask()
#28 0x7efdba92fcda base::MessageLoop::RunTask()
#29 0x7efdba92ff64 base::MessageLoop::DeferOrRunPendingTask()
#30 0x7efdba93024e base::MessageLoop::DoWork()
#31 0x7efdba94856c base::MessagePumpGlib::HandleDispatch()
#32 0x7efdba948d31 base::(anonymous namespace)::WorkSourceDispatch()
#33 0x7efdaad8ee04 g_main_context_dispatch
#34 0x7efdaad8f048 <unknown>
#35 0x7efdaad8f0ec g_main_context_iteration
#36 0x7efdba94866f base::MessagePumpGlib::Run()
#37 0x7efdba92f85a base::MessageLoop::RunHandler()
#38 0x7efdba9d5f14 base::RunLoop::Run()
#39 0x7efdbcd92b4f ChromeBrowserMainParts::MainMessageLoopRun()
#40 0x7efdb43e7c59 content::BrowserMainLoop::RunMainMessageLoopParts()
#41 0x7efdb43f3195 content::BrowserMainRunnerImpl::Run()
#42 0x7efdb43e1888 content::BrowserMain()
#43 0x7efdb5aec796 content::RunNamedProcessTypeMain()
#44 0x7efdb5aee842 content::ContentMainRunnerImpl::Run()
#45 0x7efdb5aeba82 content::ContentMain()
#46 0x7efdbb6f8f5b ChromeMain
#47 0x7efdbb6f8ef2 main
#48 0x7efda817ef45 __libc_start_main
#49 0x7efdbb6f8df5 <unknown>