[Webkit-unassigned] [Bug 61733] New: [Chromium] REGRESSION: Crash in WebCore::HTMLLinkElement::onloadTimerFired after r87628

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=61733

           Summary: [Chromium] REGRESSION: Crash in
                    WebCore::HTMLLinkElement::onloadTimerFired after
                    r87628
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P1
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mnaganov at chromium.org


Having r87628 in place, Chrome reliability bot crashes in WebCore::HTMLLinkElement::onloadTimerFired

http://build.chromium.org/p/chromium/builders/Win%20Reliability/builds/4073/steps/reliability%3A%20partial%20result%20of%20current%20build/logs/stdio

This is because the change makes WebCore::CachedResource::setRequest to call checkNotify on request reset.
HTMLLinkElement registers itself as CachedResource client via m_cachedSheet, which can happen even if m_cachedLinkResource wasn't set.
As a result, WebCore::HTMLLinkElement::notifyFinished is got called with unset m_cachedLinkResource, which causes a crash in HTMLLinkElement::onloadTimerFired

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