hitting this DCHECK on my nautilus with ToT simplechrome build with gn args

  dcheck_always_on=true

Please take a look :-)

[6774:6774:0502/115638.618123:FATAL:thread_restrictions.cc(29)] Check failed: !g_blocking_disallowed.Get().Get(). Function marked as blocking was called from a scope that disallows blocking! If this task is running inside the TaskScheduler, it needs to have MayBlock() in its TaskTraits. Otherwise, consider making this blocking work asynchronous or, as a last resort, you may use ScopedAllowBlocking in a narrow scope.
#0 0x5a351a99ab6c base::debug::StackTrace::StackTrace()
#1 0x5a351a90a4d0 logging::LogMessage::~LogMessage()
#2 0x5a351a96a6d6 base::AssertBlockingAllowed()
#3 0x5a351a9a0b87 base::CreateTemporaryDirInDirImpl()
#4 0x5a351a9a0f20 base::CreateNewTempDirectory()
#5 0x5a351a904f5e base::ScopedTempDir::CreateUniqueTempDir()
#6 0x5a3519545149 chromeos::smb_client::TempFileManager::TempFileManager()
#7 0x5a35195435b1 chromeos::smb_client::SmbService::SmbService()
#8 0x5a35195443fa chromeos::smb_client::SmbServiceFactory::BuildServiceInstanceFor()
#9 0x5a351cbc62d5 BrowserContextKeyedServiceFactory::BuildServiceInstanceFor()
#10 0x5a351c53a375 KeyedServiceFactory::GetServiceForContext()
#11 0x5a351c53b789 DependencyManager::CreateContextServices()
#12 0x5a351cbc5db3 BrowserContextDependencyManager::DoCreateBrowserContextServices()
#13 0x5a351a7b265b ProfileImpl::OnLocaleReady()
#14 0x5a3517d4c9bc _ZN4base8internal22CancelableCallbackImplINS_17RepeatingCallbackIFvvEEEE16ForwardRepeatingIJEEEvDpT_
#15 0x5a3519291e49 chromeos::(anonymous namespace)::FinishSwitchLanguage()
#16 0x5a3519291ef2 _ZN4base8internal7InvokerINS0_9BindStateIPFvNSt3__110unique_ptrIN8chromeos12_GLOBAL__N_118SwitchLanguageDataENS3_14default_deleteIS7_EEEEEJNS0_13PassedWrapperISA_EEEEEFvvEE3RunEPNS0_13BindStateBaseE
#17 0x5a351a965ad5 base::(anonymous namespace)::PostTaskAndReplyRelay::RunReply()
#18 0x5a351a965ba6 _ZN4base8internal7InvokerINS0_9BindStateIPFvNS_12_GLOBAL__N_121PostTaskAndReplyRelayEEJS4_EEEFvvEE7RunOnceEPNS0_13BindStateBaseE
#19 0x5a351a8f30ee base::debug::TaskAnnotator::RunTask()
#20 0x5a351a9c41f6 base::internal::IncomingTaskQueue::RunTask()
#21 0x5a351a912d06 base::MessageLoop::RunTask()
#22 0x5a351a913117 base::MessageLoop::DeferOrRunPendingTask()
#23 0x5a351a9133a8 base::MessageLoop::DoWork()
#24 0x5a351a9ae7b9 base::MessagePumpLibevent::Run()
#25 0x5a351a912631 base::MessageLoop::Run()
#26 0x5a351a93e396 base::RunLoop::Run()
#27 0x5a351a52d964 ChromeBrowserMainParts::MainMessageLoopRun()
#28 0x5a35185160e4 content::BrowserMainLoop::RunMainMessageLoopParts()
#29 0x5a3518518e03 content::BrowserMainRunnerImpl::Run()
#30 0x5a3518511f8d content::BrowserMain()
#31 0x5a351a513014 content::RunNamedProcessTypeMain()
#32 0x5a351a5143b3 content::ContentMainRunnerImpl::Run()
#33 0x5a351a520bee service_manager::Main()
#34 0x5a351a511c01 content::ContentMain()
#35 0x5a35176c71ff ChromeMain
#36 0x7e2b3ec74736 __libc_start_main
#37 0x5a35176c7039 _start

Received signal 6
#0 0x5a351a99ab6c base::debug::StackTrace::StackTrace()
#1 0x5a351a99a641 base::debug::(anonymous namespace)::StackDumpSignalHandler()
#2 0x7e2b3fbca2e0 <unknown>
#3 0x7e2b3ec87dd2 gsignal
#4 0x7e2b3ec89bf6 abort
#5 0x5a351a999395 base::debug::BreakDebugger()
#6 0x5a351a90a959 logging::LogMessage::~LogMessage()
#7 0x5a351a96a6d6 base::AssertBlockingAllowed()
#8 0x5a351a9a0b87 base::CreateTemporaryDirInDirImpl()
#9 0x5a351a9a0f20 base::CreateNewTempDirectory()
#10 0x5a351a904f5e base::ScopedTempDir::CreateUniqueTempDir()
#11 0x5a3519545149 chromeos::smb_client::TempFileManager::TempFileManager()
#12 0x5a35195435b1 chromeos::smb_client::SmbService::SmbService()
#13 0x5a35195443fa chromeos::smb_client::SmbServiceFactory::BuildServiceInstanceFor()
#14 0x5a351cbc62d5 BrowserContextKeyedServiceFactory::BuildServiceInstanceFor()
#15 0x5a351c53a375 KeyedServiceFactory::GetServiceForContext()
#16 0x5a351c53b789 DependencyManager::CreateContextServices()
#17 0x5a351cbc5db3 BrowserContextDependencyManager::DoCreateBrowserContextServices()
#18 0x5a351a7b265b ProfileImpl::OnLocaleReady()
#19 0x5a3517d4c9bc _ZN4base8internal22CancelableCallbackImplINS_17RepeatingCallbackIFvvEEEE16ForwardRepeatingIJEEEvDpT_
#20 0x5a3519291e49 chromeos::(anonymous namespace)::FinishSwitchLanguage()
#21 0x5a3519291ef2 _ZN4base8internal7InvokerINS0_9BindStateIPFvNSt3__110unique_ptrIN8chromeos12_GLOBAL__N_118SwitchLanguageDataENS3_14default_deleteIS7_EEEEEJNS0_13PassedWrapperISA_EEEEEFvvEE3RunEPNS0_13BindStateBaseE
#22 0x5a351a965ad5 base::(anonymous namespace)::PostTaskAndReplyRelay::RunReply()
#23 0x5a351a965ba6 _ZN4base8internal7InvokerINS0_9BindStateIPFvNS_12_GLOBAL__N_121PostTaskAndReplyRelayEEJS4_EEEFvvEE7RunOnceEPNS0_13BindStateBaseE
#24 0x5a351a8f30ee base::debug::TaskAnnotator::RunTask()
#25 0x5a351a9c41f6 base::internal::IncomingTaskQueue::RunTask()
#26 0x5a351a912d06 base::MessageLoop::RunTask()
#27 0x5a351a913117 base::MessageLoop::DeferOrRunPendingTask()
#28 0x5a351a9133a8 base::MessageLoop::DoWork()
#29 0x5a351a9ae7b9 base::MessagePumpLibevent::Run()
#30 0x5a351a912631 base::MessageLoop::Run()
#31 0x5a351a93e396 base::RunLoop::Run()
#32 0x5a351a52d964 ChromeBrowserMainParts::MainMessageLoopRun()
#33 0x5a35185160e4 content::BrowserMainLoop::RunMainMessageLoopParts()
#34 0x5a3518518e03 content::BrowserMainRunnerImpl::Run()
#35 0x5a3518511f8d content::BrowserMain()
#36 0x5a351a513014 content::RunNamedProcessTypeMain()
#37 0x5a351a5143b3 content::ContentMainRunnerImpl::Run()
#38 0x5a351a520bee service_manager::Main()
#39 0x5a351a511c01 content::ContentMain()
#40 0x5a35176c71ff ChromeMain
#41 0x7e2b3ec74736 __libc_start_main
#42 0x5a35176c7039 _start
  r8: 0000000000000000  r9: 00007e2b3e66b740 r10: 0000000000000008 r11: 0000000000000202
 r12: 00007ffe7c079a21 r13: 00007ffe7c079fb8 r14: 00007ffe7c079b70 r15: 00007ffe7c079a20
  di: 0000000000001a76  si: 0000000000001a76  bp: 00007ffe7c0799e0  bx: 00007ffe7c079b70
  dx: 0000000000000006  ax: 0000000000000000  cx: 00007e2b3ec87dd2  sp: 00007ffe7c0798b8
  ip: 00007e2b3ec87dd2 efl: 0000000000000202 cgf: 0000000000000033 erf: 0000000000000000
 trp: 0000000000000000 msk: 0000000000000000 cr2: 0000000000000000
[end of stack trace]
Calling _exit(1). Core file will not be generated.
[0502/115640.776264:WARNING:diagnostics_writer.cc(211)] [FAIL] 002 SQLiteIntegrityCookie (File not found)