The attached trace file has native heap profiling enabled. It shows that there are no active URLRequests in the net/ MemoryDumpProvider(obtained by querying URLRequestContext::url_request_.size()). 

However, there are ~2k allocations from net::URLRequest::Start() which are not deallocated. 

Why is it that we have no URLRequests, but the function-scoped allocations (net::URLRequest::StartJob and net::URLRequest::Start) are not deallocated?

net::URLRequest::Start() goes into HttpNetworkTransaction::Start(), which appears to be the last in the stack.

↳ƒIPC::ChannelMojo::OnMessageReceived(IPC::Message const&)	
902.6 KiB
2,096
↳ƒIPC::ChannelProxy::Context::OnMessageReceived(IPC::Message const&)	
901.9 KiB
2,091
↳ƒIPC::ChannelProxy::Context::TryFilters(IPC::Message const&)	
901.9 KiB
2,091
↳ƒIPC::MessageFilterRouter::TryFilters(IPC::Message const&)	
901.9 KiB
2,091
↳ƒcontent::BrowserMessageFilter::Internal::OnMessageReceived(IPC::Message const&)	
901.2 KiB
2,086
↳ƒcontent::ResourceDispatcherHostImpl::OnMessageReceived(IPC::Message const&, content::ResourceRequesterInfo*)	
249.2 KiB
1,415
↳ƒbool IPC::MessageT<ResourceHostMsg_RequestResource_Meta, std::tuple<int, int, content::ResourceRequest>, void>::Dispatch<content::ResourceDispatcherHostImpl, content::ResourceDispatcherHostImpl, content::ResourceRequesterInfo, void (content::ResourceDispatcherHostImpl::*)(content::ResourceRequesterInfo*, int, int, content::ResourceRequest const&)>(IPC::Message const*, content::ResourceDispatcherHostImpl*, content::ResourceDispatcherHostImpl*, content::ResourceRequesterInfo*, void (content::ResourceDispatcherHostImpl::*)(content::ResourceRequesterInfo*, int, int, content::ResourceRequest const&))	
227.1 KiB
1,317
↳ƒcontent::ResourceDispatcherHostImpl::OnRequestResource(content::ResourceRequesterInfo*, int, int, content::ResourceRequest const&)	
227.1 KiB
1,317
↳ƒcontent::ResourceDispatcherHostImpl::OnRequestResourceInternal(content::ResourceRequesterInfo*, int, int, content::ResourceRequest const&, mojo::AssociatedInterfaceRequest<content::mojom::URLLoader>, mojo::AssociatedInterfacePtr<content::mojom::URLLoaderClient>)	
226.8 KiB
1,312
↳ƒcontent::ResourceDispatcherHostImpl::BeginRequest(content::ResourceRequesterInfo*, int, content::ResourceRequest const&, base::Callback<void (content::SyncLoadResult const*), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, int, mojo::AssociatedInterfaceRequest<content::mojom::URLLoader>, mojo::AssociatedInterfacePtr<content::mojom::URLLoaderClient>)	
226.8 KiB
1,312
↳ƒcontent::ResourceDispatcherHostImpl::ContinuePendingBeginRequest(scoped_refptr<content::ResourceRequesterInfo>, int, content::ResourceRequest const&, base::Callback<void (content::SyncLoadResult const*), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, int, net::HttpRequestHeaders const&, mojo::AssociatedInterfaceRequest<content::mojom::URLLoader>, mojo::AssociatedInterfacePtr<content::mojom::URLLoaderClient>, bool, int)	
226.5 KiB
1,303
↳ƒcontent::ResourceDispatcherHostImpl::BeginRequestInternal(std::unique_ptr<net::URLRequest, std::default_delete<net::URLRequest> >, std::unique_ptr<content::ResourceHandler, std::default_delete<content::ResourceHandler> >)	
225.5 KiB
1,287
↳ƒcontent::ResourceDispatcherHostImpl::StartLoading(content::ResourceRequestInfoImpl*, std::unique_ptr<content::ResourceLoader, std::default_delete<content::ResourceLoader> >)	
225.3 KiB
1,284
↳ƒcontent::ResourceLoader::StartRequest()	
225.2 KiB
1,283
↳ƒnet::URLRequest::Start()	
177.3 KiB
993
↳ƒnet::URLRequest::StartJob(net::URLRequestJob*)	
158.9 KiB
908
↳ƒnet::URLRequestHttpJob::Start()	
158.7 KiB
904
↳ƒnet::URLRequestHttpJob::AddCookieHeaderAndStart()	
152.9 KiB
852
↳ƒnet::CookieMonster::GetCookieListWithOptionsAsync(GURL const&, net::CookieOptions const&, base::Callback<void (std::vector<net::CanonicalCookie, std::allocator<net::CanonicalCookie> > const&), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&)	
152.9 KiB
852
↳ƒnet::CookieMonster::DoCookieTaskForURL(scoped_refptr<net::CookieMonster::CookieMonsterTask> const&, GURL const&)	
152.9 KiB
852
↳ƒnet::CookieMonster::GetCookieListWithOptionsTask::Run()	
152.9 KiB
852
↳ƒnet::URLRequestHttpJob::SetCookieHeaderAndStart(std::vector<net::CanonicalCookie, std::allocator<net::CanonicalCookie> > const&)	
152.8 KiB
850
↳ƒnet::URLRequestHttpJob::StartTransaction()	
152.8 KiB
850
↳ƒnet::URLRequestHttpJob::MaybeStartTransactionInternal(int)	
152.8 KiB
850
↳ƒnet::URLRequestHttpJob::StartTransactionInternal()	
152.8 KiB
849
↳ƒnet::HttpCache::Transaction::Start(net::HttpRequestInfo const*, base::Callback<void (int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, net::NetLogWithSource const&)	
152.8 KiB
849
↳ƒnet::HttpCache::Transaction::DoLoop(int)	
152.8 KiB
849
↳ƒnet::HttpCache::Transaction::DoSendRequest()	
151.1 KiB
777
↳ƒDevToolsNetworkTransaction::Start(net::HttpRequestInfo const*, base::Callback<void (int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, net::NetLogWithSource const&)	
151.1 KiB
777
↳ƒnet::HttpNetworkTransaction::Start(net::HttpRequestInfo const*, base::Callback<void (int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, net::NetLogWithSource const&)	
151.1 KiB
777

 

Deleted: trace_1-19.json.zip 5.0 MB

trace_1-19.json.zip 5.0 MB Download