Bug 173468 – Crash due to infinite recursion via FrameSelection::updateAppearanceAfterLayout

• Component: HTML Editing
• Status: RESOLVED FIXED

[Antti Koivisto]

Infinite recursion via updateAppearanceAfterLayout:

      17 libsystem_kernel.dylib: kdebug_trace
 ==> 17 WebCore: WebCore::Document::resolveStyle(WebCore::Document::ResolveStyleType) <==
          17 WebCore: WebCore::Document::updateLayout()
            17 WebCore: WebCore::Document::updateLayoutIgnorePendingStylesheets(WebCore::Document::RunPostLayoutTasks)
              17 WebCore: WebCore::VisiblePosition::canonicalPosition(WebCore::Position const&)
                17 WebCore: WebCore::VisiblePosition::init(WebCore::Position const&, WebCore::EAffinity)
                  17 WebCore: WebCore::VisiblePosition::VisiblePosition(WebCore::Position const&, WebCore::EAffinity)
                    17 WebCore: WebCore::adjustedSelectionStartForStyleComputation(WebCore::VisibleSelection const&)
                      17 WebCore: WebCore::Editor::styleForSelectionStart(WebCore::Frame*, WebCore::Node*&)
                        17 WebKit: WebKit::WebPage::editorState(WebKit::WebPage::IncludePostLayoutDataHint) const
                          17 WebKit: WebKit::WebPage::updateEditorStateAfterLayoutIfEditabilityChanged()
                            17 WebCore: WebCore::FrameSelection::updateAppearanceAfterLayout()
                              17 WebCore: WebCore::Document::resolveStyle(WebCore::Document::ResolveStyleType)
                                17 WebCore: WebCore::Document::updateLayout()
                                  17 WebCore: WebCore::Document::updateLayoutIgnorePendingStylesheets(WebCore::Document::RunPostLayoutTasks)
                                    17 WebCore: WebCore::VisiblePosition::canonicalPosition(WebCore::Position const&)
                                      17 WebCore: WebCore::VisiblePosition::init(WebCore::Position const&, WebCore::EAffinity)
                                        17 WebCore: WebCore::VisiblePosition::VisiblePosition(WebCore::Position const&, WebCore::EAffinity)
                                          17 WebCore: WebCore::adjustedSelectionStartForStyleComputation(WebCore::VisibleSelection const&)
                                            17 WebCore: WebCore::Editor::styleForSelectionStart(WebCore::Frame*, WebCore::Node*&)
                                              17 WebKit: WebKit::WebPage::editorState(WebKit::WebPage::IncludePostLayoutDataHint) const
                                                17 WebKit: WebKit::WebPage::updateEditorStateAfterLayoutIfEditabilityChanged()
                                                  17 WebCore: WebCore::FrameSelection::updateAppearanceAfterLayout()
                                                    17 WebCore: WebCore::Document::resolveStyle(WebCore::Document::ResolveStyleType)
                                                      17 WebCore: WebCore::Document::updateLayout()

[Antti Koivisto]

<rdar://problem/32597587>

[Antti Koivisto]

Created attachment 313075 [details]
patch

[Ryosuke Niwa]

Comment on attachment 313075 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=313075&action=review

r=me with the timer in FrameSelection.

> Source/WebCore/ChangeLog:11
> +        because itmay cause another call to resolveStyle. We have some cases where the style

Nit: it *may.

> Source/WebCore/page/FrameView.cpp:350
> +    m_selectionAppearanceUpdateTimer.stop();

I think it's cleaner to add this timer in FrameSelection.

> LayoutTests/editing/selection/updateAppearanceAfterLayout-recursion.html:14
> +link.setAttribute("href", "data:text/css,"+Math.random());

It seems unnecessary to use Math.random()

[Antti Koivisto]

> It seems unnecessary to use Math.random()

It is there to defeat memory cache. Otherwise the load may complete synchronously.

[Antti Koivisto]

Created attachment 313191 [details]
patch

[Build Bot]

Comment on attachment 313191 [details]
patch

Attachment 313191 [details] did not pass ios-sim-ews (ios-simulator-wk2):
Output: http://webkit-queues.webkit.org/results/3946873

New failing tests:
webrtc/video-replace-muted-track.html

[Build Bot]

Created attachment 313195 [details]
Archive of layout-test-results from ews125 for ios-simulator-wk2

The attached test failures were seen while running run-webkit-tests on the ios-sim-ews.
Bot: ews125  Port: ios-simulator-wk2  Platform: Mac OS X 10.12.5

[WebKit Commit Bot]

Comment on attachment 313191 [details]
patch

Clearing flags on attachment: 313191

Committed r218451: <http://trac.webkit.org/changeset/218451>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.