Bug 192039 – [ iOS WK2 ] Layout Test imported/blink/fast/forms/date-multiple-fields/date-multiple-fields-clearbutton-visibility-after-restore.html is flaky crash

• Status: RESOLVED
• Resolution: CONFIGURATION CHANGED
• Component: Layout and Rendering

[Truitt Savell]

The following layout test is flaky on iOS Sim WK2

imported/blink/fast/forms/date-multiple-fields/date-multiple-fields-clearbutton-visibility-after-restore.html

Probable cause:

unknown, test has been crashing for the whole history. Crash log is blaming imported/blink/fast/forms/datalist/slider-appearance-with-ticks-crash.html as the crashing test. 

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=imported%2Fblink%2Ffast%2Fforms%2Fdate-multiple-fields%2Fdate-multiple-fields-clearbutton-visibility-after-restore.html

Crash Log:
https://build.webkit.org/results/Apple%20iOS%2012%20Simulator%20Release%20WK2%20(Tests)/r238568%20(1193)/imported/blink/fast/forms/date-multiple-fields/date-multiple-fields-clearbutton-visibility-after-restore-crash-log.txt

[Alexey Proskuryakov]

Null pointer crash. I think that this is tracked in rdar://problem/45562160.

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.WebCore             	0x000000011945824f WebCore::RenderTheme::paintSliderTicks(WebCore::RenderObject const&, WebCore::PaintInfo const&, WebCore::IntRect const&) + 335 (RenderTheme.cpp:1085)
1   com.apple.WebCore             	0x000000011831a20c WebCore::RenderThemeIOS::paintSliderTrack(WebCore::RenderObject const&, WebCore::PaintInfo const&, WebCore::IntRect const&) + 380 (RenderThemeIOS.mm:822)
2   com.apple.WebCore             	0x00000001194568bd WebCore::RenderTheme::paint(WebCore::RenderBox const&, WebCore::ControlStates&, WebCore::PaintInfo const&, WebCore::LayoutRect const&) + 621 (RenderTheme.cpp:362)
3   com.apple.WebCore             	0x000000011932c375 WebCore::RenderBox::paintBoxDecorations(WebCore::PaintInfo&, WebCore::LayoutPoint const&) + 1077 (RenderBox.cpp:1294)
4   com.apple.WebCore             	0x00000001192f032b WebCore::RenderBlock::paintObject(WebCore::PaintInfo&, WebCore::LayoutPoint const&) + 75 (RenderBlock.cpp:1228)
5   com.apple.WebCore             	0x00000001192efdaf WebCore::RenderBlock::paint(WebCore::PaintInfo&, WebCore::LayoutPoint const&) + 271 (RenderBlock.cpp:1105)
6   com.apple.WebCore             	0x00000001193652f4 WebCore::RenderElement::paintAsInlineBlock(WebCore::PaintInfo&, WebCore::LayoutPoint const&) + 116 (RenderElement.cpp:993)
7   com.apple.WebCore             	0x00000001192d58c5 WebCore::InlineElementBox::paint(WebCore::PaintInfo&, WebCore::LayoutPoint const&, WebCore::LayoutUnit, WebCore::LayoutUnit) + 117 (InlineElementBox.cpp:82)
8   com.apple.WebCore             	0x00000001192dc150 WebCore::InlineFlowBox::paint(WebCore::PaintInfo&, WebCore::LayoutPoint const&, WebCore::LayoutUnit, WebCore::LayoutUnit) + 1056 (InlineFlowBox.cpp:1215)
...

[Ryosuke Niwa]

Looks like this is no longer happening according to https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#tests=imported%2Fblink%2Ffast%2Fforms%2Fdate-multiple-fields%2Fdate-multiple-fields-clearbutton-visibility-after-restore.html