[Webkit-unassigned] [Bug 208339] Web process crashes with UI-side compositing on macOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=208339

--- Comment #1 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
WebProcess::createWebPage() is in WebPage::create() which hasn't yet set the value in the m_pageMap:

    if (result.isNewEntry) {
        ASSERT(!result.iterator->value);
        result.iterator->value = WebPage::create(pageID, WTFMove(parameters));

then WebProcess::updatePageScreenProperties() tries to iterate the map:

    bool allPagesAreOnHDRScreens = allOf(m_pageMap.values(), [] (auto& page) {
        return screenSupportsHighDynamicRange(page->mainFrameView());
    });

and gets a null page.

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