Failure occurs when entering the page http://dangercove.github.com/html5-notifications/ . The reproduction URL was found in http://code.google.com/p/chromium/issues/detail?id=165826 .
<rdar://problem/12932480>
Also reproduced in Chromium debug build for me on the page: http://www.html5rocks.com/ru/tutorials/workers/basics/ [0x7f648416afae] base::debug::StackTrace::StackTrace() [0x7f648416a7d1] base::debug::(anonymous namespace)::StackDumpSignalHandler() [0x7f647ce224a0] <unknown> [0x7f6484e68653] WebCore::PseudoElement::PseudoElement() [0x7f6484e14a5b] WebCore::PseudoElement::create() [0x7f6484e0ff5b] WebCore::Element::createPseudoElementIfNeeded() [0x7f6484e0fda9] WebCore::Element::updatePseudoElement() [0x7f6484e0c3e1] WebCore::Element::attach() [0x7f6484d8800d] WebCore::ContainerNode::attachChildren() [0x7f6484d85bd0] WebCore::ContainerNode::attach() [0x7f6484e0c3cb] WebCore::Element::attach() [0x7f6484e12d06] WebCore::Node::reattach() [0x7f6484e0cc70] WebCore::Element::recalcStyle() [0x7f6484e0d104] WebCore::Element::recalcStyle() [0x7f6484d9b6c2] WebCore::Document::recalcStyle() [0x7f6484da0571] WebCore::Document::styleResolverChanged() [0x7f6484d9efa5] WebCore::Document::didRemoveAllPendingStylesheet() [0x7f6484dff9c9] WebCore::DocumentStyleSheetCollection::removePendingSheet() [0x7f648835234e] WebCore::StyleElement::sheetLoaded() [0x7f64855e60d5] WebCore::HTMLStyleElement::sheetLoaded() [0x7f6485adc78e] WebCore::StyleSheetContents::checkLoaded() [0x7f6488352263] WebCore::StyleElement::createSheet() [0x7f6488351c6f] WebCore::StyleElement::process() [0x7f64883517a8] WebCore::StyleElement::insertedIntoDocument() [0x7f64855e5b46] WebCore::HTMLStyleElement::insertedInto() [0x7f6484d88b37] WebCore::ChildNodeInsertionNotifier::notifyNodeInsertedIntoDocument() [0x7f6484d8ef43] WebCore::ChildNodeInsertionNotifier::notifyDescendantInsertedIntoDocument() [0x7f6484d88b86] WebCore::ChildNodeInsertionNotifier::notifyNodeInsertedIntoDocument() [0x7f6484d88d2a] WebCore::ChildNodeInsertionNotifier::notify() [0x7f6484d8749f] WebCore::updateTreeAfterInsertion() [0x7f6484d8559d] WebCore::ContainerNode::appendChild() [0x7f6484e4057f] WebCore::Node::appendChild() [0x7f64859b8e5b] WebCore::V8Node::appendChildCallback() [0x3551e5758873] <unknown> r8: 00007f6482d8c9c0 r9: 00007f6482dd00d0 r10: 0000000000000001 r11: 0000000000000000 r12: 00007f6477010020 r13: 00007f6482c3e0b8 r14: 00007f6476f87088 r15: 00007f6482c40dd0 di: 0000000000000000 si: 00000000efcdab90 bp: 00007fff9e65c3e0 bx: 00007f6477010020 dx: 00007f647d1a6aa0 ax: 00000000bbadbeef cx: 00007f647ced291d sp: 00007fff9e65c3b0 ip: 00007f6484e68653 efl: 0000000000010246 cgf: 0000000000000033 erf: 0000000000000006 trp: 000000000000000e msk: 0000000000000000 cr2: 00000000bbadbeef
*** This bug has been marked as a duplicate of bug 107223 ***
Reversing the dups as this is the older bug.
*** Bug 107223 has been marked as a duplicate of this bug. ***
See https://bugs.webkit.org/show_bug.cgi?id=107223#c3 for the explanation of what's going on in this bug.
In ToT debug, just going to http://usatoday.com causes this.
Created attachment 183582 [details] Patch
Comment on attachment 183582 [details] Patch Attachment 183582 [details] did not pass qt-ews (qt): Output: http://queues.webkit.org/results/15957363
Comment on attachment 183582 [details] Patch Attachment 183582 [details] did not pass qt-wk2-ews (qt): Output: http://queues.webkit.org/results/15947709
Comment on attachment 183582 [details] Patch Attachment 183582 [details] did not pass chromium-ews (chromium-xvfb): Output: http://queues.webkit.org/results/15948620
Comment on attachment 183582 [details] Patch Attachment 183582 [details] did not pass mac-ews (mac): Output: http://queues.webkit.org/results/15940972
Created attachment 183586 [details] Patch
*** Bug 107497 has been marked as a duplicate of this bug. ***
Comment on attachment 183586 [details] Patch Clearing flags on attachment: 183586 Committed r140452: <http://trac.webkit.org/changeset/140452>
All reviewed patches have been landed. Closing bug.