[Webkit-unassigned] [Bug 50256] New: Web Inspector: [CRASH] on "Revert to this revision" of style with import.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=50256

           Summary: Web Inspector: [CRASH] on "Revert to this revision" of
                    style with import.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: pfeldman at chromium.org
                CC: timothy at apple.com, rik at webkit.org, keishi at webkit.org,
                    pmuellr at yahoo.com, joepeck at webkit.org,
                    pfeldman at chromium.org, yurys at chromium.org,
                    bweinstein at apple.com, apavlov at chromium.org,
                    loislo at chromium.org


1. Go to apple.com
2. Open inspector
3. edit font-size in body's selector
4. Revert to original in the resources tab

CRASH:

#0    0x1016cdc81 in WebCore::Document::removePendingSheet at Document.cpp:2856
#1    0x10195e1ce in WebCore::HTMLLinkElement::sheetLoaded at HTMLLinkElement.cpp:362
#2    0x10167bc70 in WebCore::CSSStyleSheet::checkLoaded at CSSStyleSheet.cpp:232
#3    0x102024bf1 in WebCore::StyleBase::checkLoaded at StyleBase.cpp:40
#4    0x10167bc3b in WebCore::CSSStyleSheet::checkLoaded at CSSStyleSheet.cpp:226
#5    0x1015f0283 in WebCore::CSSImportRule::setCSSStyleSheet at CSSImportRule.cpp:104
#6    0x10153f545 in WebCore::CachedCSSStyleSheet::didAddClient at CachedCSSStyleSheet.cpp:57
#7    0x1015470a7 in WebCore::CachedResource::addClient at CachedResource.cpp:216
#8    0x1015ef8c7 in WebCore::CSSImportRule::insertedIntoParent at CSSImportRule.cpp:148
#9    0x102029f82 in WebCore::StyleList::append at StyleList.cpp:35
#10    0x1015e4848 in cssyyparse at CSSGrammar.y:385
#11    0x10160d2e3 in WebCore::CSSParser::parseSheet at CSSParser.cpp:233
#12    0x10167bf98 in WebCore::CSSStyleSheet::parseStringAtLine at CSSStyleSheet.cpp:206
#13    0x10167bff3 in WebCore::CSSStyleSheet::parseString at CSSStyleSheet.cpp:199
#14    0x101a91e4d in WebCore::InspectorStyleSheet::reparseStyleSheet at InspectorStyleSheet.cpp:590
#15    0x101a2ffa2 in WebCore::InspectorCSSAgent::setStyleSheetText2 at InspectorCSSAgent.cpp:298

Here is where it crashes:

// This method is called whenever a top-level stylesheet has finished loading.
void Document::removePendingSheet()
{
    // Make sure we knew this sheet was pending, and that our count isn't out of sync.
    ASSERT(m_pendingStylesheets > 0);

    m_pendingStylesheets--;

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