Regression range: http://trac.webkit.org/log/?verbose=on&rev=99879&stop_rev=99870. Of those, http://trac.webkit.org/changeset/99870/ seems like the most likely (only?) possible culprit. vsevik, mind tracking down which revision caused the failure? Looks like we're hitting an assert in the font code. Stacktrace: ASSERTION FAILED: fontCache()->generation() == m_generation /b/build/slave/webkit-mac-cg-latest-dbg/build/src/third_party/WebKit/Source/WebCore/WebCore.gyp/../platform/graphics/FontFallbackList.cpp(104) : const WebCore::FontData *WebCore::FontFallbackList::fontDataAt(const WebCore::Font *, unsigned int) const 1 0x3f517018 WebCore::FontFallbackList::fontDataAt(WebCore::Font const*, unsigned int) const 2 0x3f66df69 WebCore::FontFallbackList::primaryFontData(WebCore::Font const*) const 3 0x3f516dbc WebCore::FontFallbackList::determinePitch(WebCore::Font const*) const 4 0x401e3c5b WebCore::FontFallbackList::isFixedPitch(WebCore::Font const*) const 5 0x401ddd9b WebCore::Font::isFixedPitch() const 6 0x40355ccd WebCore::RenderText::widthFromCache(WebCore::Font const&, int, int, float, WTF::HashSet<WebCore::SimpleFontData const*, WTF::PtrHash<WebCore::SimpleFontData const*>, WTF::HashTraits<WebCore::SimpleFontData const*> >*, WebCore::GlyphOverflow*) const 7 0x4035157b WebCore::RenderText::computePreferredLogicalWidths(float, WTF::HashSet<WebCore::SimpleFontData const*, WTF::PtrHash<WebCore::SimpleFontData const*>, WTF::HashTraits<WebCore::SimpleFontData const*> >&, WebCore::GlyphOverflow&) 8 0x40350aad WebCore::RenderText::computePreferredLogicalWidths(float) 9 0x403502c0 WebCore::RenderText::trimmedPrefWidths(float, float&, bool&, float&, bool&, bool&, bool&, float&, float&, float&, float&, bool&) 10 0x4017d5f6 WebCore::RenderBlock::computeInlinePreferredLogicalWidths() 11 0x4017c781 WebCore::RenderBlock::computePreferredLogicalWidths() 12 0x401f4c8c WebCore::RenderBox::minPreferredLogicalWidth() const 13 0x4017dd77 WebCore::RenderBlock::computeBlockPreferredLogicalWidths() 14 0x4017c794 WebCore::RenderBlock::computePreferredLogicalWidths() 15 0x401f4c8c WebCore::RenderBox::minPreferredLogicalWidth() const 16 0x4017dd77 WebCore::RenderBlock::computeBlockPreferredLogicalWidths() 17 0x4017c794 WebCore::RenderBlock::computePreferredLogicalWidths() 18 0x401f4c8c WebCore::RenderBox::minPreferredLogicalWidth() const 19 0x4017dd77 WebCore::RenderBlock::computeBlockPreferredLogicalWidths() 20 0x4017c794 WebCore::RenderBlock::computePreferredLogicalWidths() 21 0x401f4c8c WebCore::RenderBox::minPreferredLogicalWidth() const 22 0x4017dd77 WebCore::RenderBlock::computeBlockPreferredLogicalWidths() 23 0x4017c794 WebCore::RenderBlock::computePreferredLogicalWidths() 24 0x401f4c8c WebCore::RenderBox::minPreferredLogicalWidth() const 25 0x4017dd77 WebCore::RenderBlock::computeBlockPreferredLogicalWidths() 26 0x4017c794 WebCore::RenderBlock::computePreferredLogicalWidths() 27 0x4037927d WebCore::RenderView::computePreferredLogicalWidths() 28 0x401f4c8c WebCore::RenderBox::minPreferredLogicalWidth() const 29 0x3d88e1ea WebKit::WebFrameImpl::contentsPreferredWidth() const 30 0x3d7b5f57 WebViewHost::didUpdateLayout(WebKit::WebFrame*) 31 0x3d7b5fd9 non-virtual thunk to WebViewHost::didUpdateLayout(WebKit::WebFrame*) [65007:2307:952952286070233:ERROR:process_util_posix.cc(134)] Received signal 11 CONSOLE MESSAGE: line 1: Uncaught 42 CONSOLE MESSAGE: line 1: Uncaught SyntaxError: Unexpected token < 0 DumpRenderTree 0x3d6f76df base::debug::StackTrace::StackTrace() + 63 1 DumpRenderTree 0x3d6f767b base::debug::StackTrace::StackTrace() + 43 2 DumpRenderTree 0x3dd67397 base::(anonymous namespace)::StackDumpSignalHandler(int, __siginfo*, __darwin_ucontext*) + 295 3 libSystem.B.dylib 0x963b305b _sigtramp + 43 4 ??? 0xffffffff 0x0 + 4294967295 5 DumpRenderTree 0x3f66df69 WebCore::FontFallbackList::primaryFontData(WebCore::Font const*) const + 73 6 DumpRenderTree 0x3f516dbc WebCore::FontFallbackList::determinePitch(WebCore::Font const*) const + 60 7 DumpRenderTree 0x401e3c5b WebCore::FontFallbackList::isFixedPitch(WebCore::Font const*) const + 91 8 DumpRenderTree 0x401ddd9b WebCore::Font::isFixedPitch() const + 171 9 DumpRenderTree 0x40355ccd WebCore::RenderText::widthFromCache(WebCore::Font const&, int, int, float, WTF::HashSet<WebCore::SimpleFontData const*, WTF::PtrHash<WebCore::SimpleFontData const*>, WTF::HashTraits<WebCore::SimpleFontData const*> >*, WebCore::GlyphOverflow*) const + 269 10 DumpRenderTree 0x4035157b WebCore::RenderText::computePreferredLogicalWidths(float, WTF::HashSet<WebCore::SimpleFontData const*, WTF::PtrHash<WebCore::SimpleFontData const*>, WTF::HashTraits<WebCore::SimpleFontData const*> >&, WebCore::GlyphOverflow&) + 2619 11 DumpRenderTree 0x40350aad WebCore::RenderText::computePreferredLogicalWidths(float) + 109 12 DumpRenderTree 0x403502c0 WebCore::RenderText::trimmedPrefWidths(float, float&, bool&, float&, bool&, bool&, bool&, float&, float&, float&, float&, bool&) + 336 13 DumpRenderTree 0x4017d5f6 WebCore::RenderBlock::computeInlinePreferredLogicalWidths() + 2262 14 DumpRenderTree 0x4017c781 WebCore::RenderBlock::computePreferredLogicalWidths() + 481 15 DumpRenderTree 0x401f4c8c WebCore::RenderBox::minPreferredLogicalWidth() const + 76 16 DumpRenderTree 0x4017dd77 WebCore::RenderBlock::computeBlockPreferredLogicalWidths() + 887 17 DumpRenderTree 0x4017c794 WebCore::RenderBlock::computePreferredLogicalWidths() + 500 18 DumpRenderTree 0x401f4c8c WebCore::RenderBox::minPreferredLogicalWidth() const + 76 19 DumpRenderTree 0x4017dd77 WebCore::RenderBlock::computeBlockPreferredLogicalWidths() + 887 20 DumpRenderTree 0x4017c794 WebCore::RenderBlock::computePreferredLogicalWidths() + 500 21 DumpRenderTree 0x401f4c8c WebCore::RenderBox::minPreferredLogicalWidth() const + 76 22 DumpRenderTree 0x4017dd77 WebCore::RenderBlock::computeBlockPreferredLogicalWidths() + 887 23 DumpRenderTree 0x4017c794 WebCore::RenderBlock::computePreferredLogicalWidths() + 500 24 DumpRenderTree 0x401f4c8c WebCore::RenderBox::minPreferredLogicalWidth() const + 76 25 DumpRenderTree 0x4017dd77 WebCore::RenderBlock::computeBlockPreferredLogicalWidths() + 887 26 DumpRenderTree 0x4017c794 WebCore::RenderBlock::computePreferredLogicalWidths() + 500 27 DumpRenderTree 0x401f4c8c WebCore::RenderBox::minPreferredLogicalWidth() const + 76 28 DumpRenderTree 0x4017dd77 WebCore::RenderBlock::computeBlockPreferredLogicalWidths() + 887 29 DumpRenderTree 0x4017c794 WebCore::RenderBlock::computePreferredLogicalWidths() + 500 30 DumpRenderTree 0x4037927d WebCore::RenderView::computePreferredLogicalWidths() + 141 31 DumpRenderTree 0x401f4c8c WebCore::RenderBox::minPreferredLogicalWidth() const + 76 32 DumpRenderTree 0x3d88e1ea WebKit::WebFrameImpl::contentsPreferredWidth() const + 154 33 DumpRenderTree 0x3d7b5f57 WebViewHost::didUpdateLayout(WebKit::WebFrame*) + 103 34 DumpRenderTree 0x3d7b5fd9 non-virtual thunk to WebViewHost::didUpdateLayout(WebKit::WebFrame*) + 41 35 DumpRenderTree 0x3d7e5857 WebKit::ChromeClientImpl::layoutUpdated(WebCore::Frame*) const + 103 36 DumpRenderTree 0x3fe536f7 WebCore::FrameView::layout(bool) + 5015 37 DumpRenderTree 0x3fe4e572 WebCore::FrameView::layoutTimerFired(WebCore::Timer<WebCore::FrameView>*) + 66 38 DumpRenderTree 0x3fe6a197 WebCore::Timer<WebCore::FrameView>::fired() + 135 39 DumpRenderTree 0x3f47fe11 WebCore::ThreadTimers::sharedTimerFiredInternal() + 337 40 DumpRenderTree 0x3f47fb9f WebCore::ThreadTimers::sharedTimerFired() + 47 41 DumpRenderTree 0x40d89749 webkit_glue::WebKitPlatformSupportImpl::DoTimeout() + 73 42 DumpRenderTree 0x40d8a371 void DispatchToMethod<webkit_glue::WebKitPlatformSupportImpl, void (webkit_glue::WebKitPlatformSupportImpl::*)()>(webkit_glue::WebKitPlatformSupportImpl*, void (webkit_glue::WebKitPlatformSupportImpl::*)(), Tuple0 const&) + 145 43 DumpRenderTree 0x40d8a232 base::BaseTimer<webkit_glue::WebKitPlatformSupportImpl, false>::TimerTask::Run() + 130 44 DumpRenderTree 0x3dda9c82 base::subtle::TaskClosureAdapter::Run() + 50 45 DumpRenderTree 0x3dd1eb3f base::internal::Invoker1<false, base::internal::InvokerStorage1<void (base::subtle::TaskClosureAdapter::*)(), base::subtle::TaskClosureAdapter*>, void (base::subtle::TaskClosureAdapter::*)()>::DoInvoke(base::internal::InvokerStorageBase*) + 143 46 DumpRenderTree 0x3dd176bb base::Callback<void ()()>::Run() const + 75 47 DumpRenderTree 0x3dd14ccd MessageLoop::RunTask(MessageLoop::PendingTask const&) + 1069 48 DumpRenderTree 0x3dd14ed1 MessageLoop::DeferOrRunPendingTask(MessageLoop::PendingTask const&) + 97 49 DumpRenderTree 0x3dd15108 MessageLoop::DoWork() + 312 50 DumpRenderTree 0x3dc9647b base::MessagePumpCFRunLoopBase::RunWork() + 107 51 DumpRenderTree 0x3dc95b72 base::MessagePumpCFRunLoopBase::RunWorkSource(void*) + 50 52 CoreFoundation 0x956da42b __CFRunLoopDoSources0 + 1563 53 CoreFoundation 0x956d7eef __CFRunLoopRun + 1071 54 CoreFoundation 0x956d73c4 CFRunLoopRunSpecific + 452 55 CoreFoundation 0x956d71f1 CFRunLoopRunInMode + 97 56 HIToolbox 0x98477e04 RunCurrentEventLoopInMode + 392 57 HIToolbox 0x98477bb9 ReceiveNextEventCommon + 354 58 HIToolbox 0x98477a3e BlockUntilNextEventMatchingListInMode + 81 59 AppKit 0x97282595 _DPSNextEvent + 847 60 AppKit 0x97281dd6 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 156 61 AppKit 0x972441f3 -[NSApplication run] + 821 ax: bbadbeef, bx: 16313718, cx: 8c25fe40, dx: 8c25fe40 di: 4106010c, si: 4106007b, bp: bfffb7e8, sp: bfffb760, ss: 23, flags: 10286 ip: 3f51701d, cs: 1b, ds: 23, es: 23, fs: 0, gs: f
FYI: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=fast%2Fdom%2Fjavascript-url-exception-isolation.html
Hmmm...fast/frames/sandboxed-iframe-navigation-targetlink.html has the same stack, except the regression range is http://trac.webkit.org/log/?verbose=on&rev=99889&stop_rev=99880. And it appears fast/dom/javascript-url-exception-isolation.html crashing on Webkit Mac10.6 (CG)(dbg) started passing in the same run. :( We must have some corruption that isn't tied to a specific test. Not sure who knows this code, but Julien was the last to modify it. :)
> Not sure who knows this code, but Julien was the last to modify it. :) Nice try but I have no clue about the exact reason! This ASSERT is widely seen on our bots and it looks like a timing issue. See bug 59552 for more test failing...
It seems like the other bug covers this adequately? *** This bug has been marked as a duplicate of bug 59552 ***