[Webkit-unassigned] [Bug 127034] New: Suspend resource requests during computedStyle

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=127034

           Summary: Suspend resource requests during computedStyle
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: koivisto at iki.fi


We have some cases where getting computed style leads to crashes in loadPendingImages. This is probably caused by load callbacks triggering re-entering webkit and killing the StyleResolver. 

(lldb) bt
* thread #5: tid = 0x2403, 0x00720078 UIKit`.str44 + 636054, stop reason = EXC_BAD_ACCESS (code=13, address=0x0)
    frame #0: 0x00720078 UIKit`.str44 + 636054
    frame #1: 0x03400532 WebCore`WebCore::StyleResolver::loadPendingImages() + 802
    frame #2: 0x033f80f9 WebCore`WebCore::StyleResolver::applyMatchedProperties(WebCore::StyleResolver::MatchResult const&) + 1097
    frame #3: 0x033f2bf1 WebCore`WebCore::StyleResolver::styleForElement(WebCore::Element*, WebCore::RenderStyle*, WebCore::StyleSharingBehavior, WebCore::RuleMatchingBehavior, WebCore::RenderRegion*) + 3489
    frame #4: 0x02a3b180 WebCore`WebCore::Document::styleForElementIgnoringPendingStylesheets(WebCore::Element*) + 144
    frame #5: 0x02b141b9 WebCore`WebCore::Element::computedStyle(WebCore::PseudoId) + 121
    frame #6: 0x0296e14f WebCore`WebCore::CSSComputedStyleDeclaration::getPropertyCSSValue(WebCore::CSSPropertyID, WebCore::EUpdateLayout) const + 479    
    frame #7: 0x0296dc1f WebCore`WebCore::CSSComputedStyleDeclaration::getPropertyValue(WebCore::CSSPropertyID) const + 47
    frame #8: 0x02986a88 WebCore`WebCore::CSSComputedStyleDeclaration::getPropertyValue(WTF::String const&) + 56
    frame #9: 0x02e0e997

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