The following layout test is failing on [insert platform] fast/block/margin-collapse/103.html Probable cause: WebKit blame range: http://trac.webkit.org/log/?verbose=on&rev=117821&stop_rev=117815 Abbreviated stack is: STDERR: ASSERTION FAILED: newLogicalTop >= logicalTop STDERR: Backtrace: STDERR: WebKit::WebURLRequest::hasUserGesture [0x0247F0EE+11353182] ... STDERR: WebKit::WebURLRequest::hasUserGesture [0x02EBCBB6+22091558] STDERR: webkit_glue::WebURLResponseExtraDataImpl::~WebURLResponseExtraDataImpl [0x099788AE+949584] STDERR: (No symbol) [0x005071B9] ... STDERR: (No symbol) [0x0050DFFC] STDERR: base::SharedMemory::CreateAnonymous [0x00B67B7F+364615] ... STDERR: base::SharedMemory::CreateAnonymous [0x00B6EC70+393528] STDERR: (No symbol) [0x004ABB8D] ... STDERR: (No symbol) [0x00500A0F] STDERR: RegisterWaitForInputIdle [0x7C817077+73] Test results: http://build.chromium.org/f/chromium/layout_test_results/Webkit_Win__dbg__1_/138145/layout-test-results.zip
Subpixel layout is the most likely culprit given the range and assert. Assigning to eae@ for investigation.
Also, only failing on webkit win debug.
Flakiness dashboard link: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=fast%2Fblock%2Fmargin-collapse%2F103.html
Created attachment 143420 [details] Reduced test case The crash seems to be window size specific. With the reduced test case (attached) it doesn't crash when loaded but as soon as the window is made small enough to toggle scrolling
No longer showing on flakiness dashboard. Presumably fixed, re-open at will.