[Webkit-unassigned] [Bug 203837] New: Adding logging to diagnose crashes resulting from provisional document loader unexpectedly being nullptr

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203837

            Bug ID: 203837
           Summary: Adding logging to diagnose crashes resulting from
                    provisional document loader unexpectedly being nullptr
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rniwa at webkit.org
                CC: beidson at apple.com

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

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