[Webkit-unassigned] [Bug 218375] [GTK] wpt is very flaky on my Linux box

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218375

--- Comment #3 from Fujii Hironori <Hironori.Fujii at sony.com> ---
This issue can be reproduced by invoking WebKitTestRunner manually.

./Tools/Scripts/run-webkit-httpd --no-httpd
./Tools/Scripts/webkit-flatpak --gtk --release -c /usr/bin/bash
export TEST_RUNNER_TEST_PLUGIN_PATH=$PWD/WebKitBuild/GTK/Release/lib
yes http://localhost:8800/css/css-cascade/all-prop-001.html | head -3000 | WebKitBuild/GTK/Release/bin/WebKitTestRunner - | tee wpt.log

WebKitTestRunner renders blank pages intermittently.

> Content-Type: text/plain
> layer at (0,0) size 800x600
>   RenderView at (0,0) size 800x600
> layer at (0,0) size 800x158
>   RenderBlock {HTML} at (0,0) size 800x158
>     RenderBody {BODY} at (8,16) size 784x134
>       RenderBlock {P} at (0,0) size 784x18
>         RenderText {#text} at (0,0) size 294x17
>           text run at (0,0) width 294: "Test passes if there is a filled green square and "
>         RenderInline {STRONG} at (0,0) size 45x17
>           RenderText {#text} at (293,0) size 45x17
>             text run at (293,0) width 45: "no red"
>         RenderText {#text} at (337,0) size 5x17
>           text run at (337,0) width 5: "."
> layer at (8,50) size 784x100
>   RenderBlock (relative positioned) {DIV} at (0,34) size 784x100
>     RenderBlock {DIV} at (684,0) size 100x100 [bgcolor=#FF0000]
> layer at (692,50) size 100x100
>   RenderBlock (positioned) {DIV} at (684,0) size 100x100 [bgcolor=#008000]
> #EOF
> #EOF
> Content-Type: text/plain
> layer at (0,0) size 800x600
>   RenderView at (0,0) size 800x600
> layer at (0,0) size 800x600
>   RenderBlock {HTML} at (0,0) size 800x600
>     RenderBody {BODY} at (8,8) size 784x584
> #EOF
> #EOF

Grepping RenderBody and numbering and greping the blank page.

grep RenderBody wpt.log | cat -n | grep 784x584
   293      RenderBody {BODY} at (8,8) size 784x584
   586      RenderBody {BODY} at (8,8) size 784x584
   886      RenderBody {BODY} at (8,8) size 784x584
  1163      RenderBody {BODY} at (8,8) size 784x584
  1442      RenderBody {BODY} at (8,8) size 784x584
  1716      RenderBody {BODY} at (8,8) size 784x584
  1995      RenderBody {BODY} at (8,8) size 784x584
  2263      RenderBody {BODY} at (8,8) size 784x584
  2545      RenderBody {BODY} at (8,8) size 784x584
  2827      RenderBody {BODY} at (8,8) size 784x584

constantly failing.

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