I was randomly reloading the page with the "update on reload" on a build with dcheck_always_on=1.
#0 0x7f65440c926e base::debug::StackTrace::StackTrace()
#1 0x7f65440df91b logging::LogMessage::~LogMessage()
#2 0x7f6546bc2d09 content::ServiceWorkerJobCoordinator::Update()
#3 0x7f6546ba3321 content::ServiceWorkerContextCore::UpdateServiceWorker()
#4 0x7f6546e334e4 content::ServiceWorkerControlleeRequestHandler::DidLookupRegistrationForMainResource()
#5 0x7f6543f79fdb _ZN4base8internal7InvokerINS_13IndexSequenceIJLm0EEEENS0_9BindStateINS0_15RunnableAdapterIMN15local_discovery28ServiceDiscoveryDeviceListerEFvNS6_14ServiceWatcher10UpdateTypeERKSsEEEFvPS7_S9_SB_EJNS_7WeakPtrIS7_EEEEENS0_12InvokeHelperILb1EvSE_EEFvS9_SB_EE3RunEPNS0_13BindStateBaseEOS9_SB_
#6 0x7f6546bd38ea content::ServiceWorkerStorage::FindRegistrationForDocument()
#7 0x7f6546e32ece content::ServiceWorkerControlleeRequestHandler::PrepareForMainResource()
#8 0x7f6546e32b37 content::ServiceWorkerControlleeRequestHandler::MaybeCreateJob()
#9 0x7f65444835a6 net::URLRequestInterceptingJobFactory::MaybeCreateJobWithProtocolHandler()
#10 0x7f65444835be net::URLRequestInterceptingJobFactory::MaybeCreateJobWithProtocolHandler()
#11 0x7f6543d512e2 ProtocolHandlerRegistry::JobInterceptorFactory::MaybeCreateJobWithProtocolHandler()
#12 0x7f6544486a00 net::URLRequestJobManager::CreateJob()
#13 0x7f654447c93a net::URLRequest::BeforeRequestComplete()
#14 0x7f654447c496 net::URLRequest::Start()
#15 0x7f6546b21c81 content::ResourceLoader::StartRequestInternal()
#16 0x7f6546b24530 content::ResourceLoader::Resume()
#17 0x7f6546b2a560 content::ThrottlingResourceHandler::ResumeStart()
#18 0x7f6546b2a44d content::ThrottlingResourceHandler::Resume()
#19 0x7f6546dbbe94 content::NavigationResourceThrottle::OnUIChecksPerformed()
Comment 1 by pfeldman@chromium.org
, Apr 7 2016