[Webkit-unassigned] [Bug 128283] New: REGRESSION (r163262?): transitions/shorthand-border-transitions.html flakily asserts

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=128283

           Summary: REGRESSION (r163262?):
                    transitions/shorthand-border-transitions.html flakily
                    asserts
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: MakingBotsRed, Regression
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ap at webkit.org
                CC: zalan at apple.com


transitions/shorthand-border-transitions.html  has started to flakily assert on WebKit2 debug testers:

ASSERTION FAILED: !rect.isEmpty()

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.JavaScriptCore          0x00000001106fd90a WTFCrash + 42 (Assertions.cpp:333)
1   com.apple.WebCore                 0x000000011209d410 WebCore::GraphicsContext::drawRect(WebCore::FloatRect const&) + 128 (GraphicsContextCG.cpp:293)
2   com.apple.WebCore                 0x0000000112e8b0a1 WebCore::RenderObject::drawLineForBoxSide(WebCore::GraphicsContext*, WebCore::LayoutUnit, WebCore::LayoutUnit, WebCore::LayoutUnit, WebCore::LayoutUnit, WebCore::BoxSide, WebCore::Color, WebCore::EBorderStyle, int, int, bool) + 16193 (RenderObject.cpp:937)
3   com.apple.WebCore                 0x0000000112d58723 WebCore::RenderBoxModelObject::paintOneBorderSide(WebCore::GraphicsContext*, WebCore::RenderStyle const*, WebCore::RoundedRect const&, WebCore::RoundedRect const&, WebCore::LayoutRect const&, WebCore::BoxSide, WebCore::BoxSide, WebCore::BoxSide, WebCore::BorderEdge const*, WebCore::Path const*, WebCore::BackgroundBleedAvoidance, bool, bool, bool, WebCore::Color const*) + 2419 (RenderBoxModelObject.cpp:1695)

A lot of similar assertions were introduced in r163262 and fixed in r163264, but this one is still happening. The first occurrence was on r163263, and it happens about 1 time out of 10.

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