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
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.
This is readily reproducible locally.
I tried to repro it a few times with no success...I'll try again.
I was simply running this command, and could reproduce two times out of three:
run-webkit-tests -2 transitions/shorthand-border-transitions.html
Should probably be easier to reproduce with "--iterations 100".
Skipped the test in debug builds in <http://trac.webkit.org/r163951>.
Probably a dup of bug #128395?