We're getting nullptr crashes in various loader code where the provisional document loader unexpectedly is nullptr. e.g. 0 com.apple.WebKit 0x0000000108f75a75 WebKit::WebFrameLoaderClient::dispatchDidChangeProvisionalURL() + 67 1 com.apple.WebCore 0x000000010ae9c909 WebCore::DocumentLoader::willSendRequest(WebCore::ResourceRequest&&, WebCore::ResourceResponse const&, WTF::CompletionHandler<void (WebCore::ResourceRequest&&)>&&) + 1465 2 com.apple.WebCore 0x000000010ae9cc46 non-virtual thunk to WebCore::DocumentLoader::redirectReceived(WebCore::CachedResource&, WebCore::ResourceRequest&&, WebCore::ResourceResponse const&, WTF::CompletionHandler<void (WebCore::ResourceRequest&&)>&&) + 118 3 com.apple.WebCore 0x000000010af10391 WebCore::iterateClients(WebCore::CachedResourceClientWalker<WebCore::CachedRawResourceClient>&&, WebCore::CachedResourceHandle<WebCore::CachedRawResource>&&, WebCore::ResourceRequest&&, std::__1::unique_ptr<WebCore::ResourceResponse, std::__1::default_delete<WebCore::ResourceResponse> >&&, WTF::CompletionHandler<void (WebCore::ResourceRequest&&)>&&) + 433 4 com.apple.WebCore 0x000000010af10055 WebCore::CachedRawResource::redirectReceived(WebCore::ResourceRequest&&, WebCore::ResourceResponse const&, WTF::CompletionHandler<void (WebCore::ResourceRequest&&)>&&) + 1285 5 com.apple.WebCore 0x000000010aee7cae WebCore::SubresourceLoader::willSendRequestInternal(WebCore::ResourceRequest&&, WebCore::ResourceResponse const&, WTF::CompletionHandler<void (WebCore::ResourceRequest&&)>&&) + 4126 6 com.apple.WebKit 0x0000000108f4796f WebKit::WebResourceLoader::willSendRequest(WebCore::ResourceRequest&&, WebCore::ResourceResponse&&) + 457 7 com.apple.WebKit 0x000000010907df17 WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&) + 423 8 com.apple.WebKit 0x0000000108f4184c WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) + 702 9 com.apple.WebKit 0x0000000108b9bac2 IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) + 164 10 com.apple.WebKit 0x0000000108b9efff IPC::Connection::dispatchOneIncomingMessage() + 189 11 com.apple.JavaScriptCore 0x000000010d289057 WTF::RunLoop::performWork() + 231
Created attachment 382799 [details] Adds logging
<rdar://problem/56891110>
Comment on attachment 382799 [details] Adds logging r=me
Committed r252077: <https://trac.webkit.org/changeset/252077>