REGRESSION (r122168): Layout Test http/tests/misc/script-defer.html is failing

[Hayato Ito]

The following layout test is failing on WebKit Mac, Linux and Win on chromium.

http/tests/misc/script-defer.html

Dashboard:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=http%2Ftests%2Fmisc%2Fscript-defer.html

I've found the same failure on Apple Lion.
http://build.webkit.org/builders/Apple%20Lion%20Debug%20WK2%20%28Tests%29/builds/1065/steps/layout-test/logs/stdio
18:23:00.347 5232   http/tests/misc/script-defer.html -> unexpected text diff mismatch

Probable cause:
The dashboard said it started to fail after r122168.

[Eric Seidel (no email)]

Sad.  I'm surprised this wasn't caught on cr-linux.  maybe cr-linux doesn't run this test?
http://trac.webkit.org/changeset/122168

[Hayato Ito]

I marked it TEXT TestExpectations on chromium in http://trac.webkit.org/changeset/122186.

(In reply to comment #1)

> Sad.  I'm surprised this wasn't caught on cr-linux.  maybe cr-linux doesn't run this test?
> http://trac.webkit.org/changeset/122168

That should run. I am not sure why cr-linux could not catch. Is it rare case?

[Adam Barth]

> That should run. I am not sure why cr-linux could not catch. Is it rare case?

It looks like Eric's patch just made it flaky.  It happened to pass in exactly the right pattern to trick the bot into landing the patch.

[Csaba Osztrogonác]

It became flakey on GTK and Qt too:
--- /home/slave/webkitgtk/gtk-linux-64-release/build/layout-test-results/http/tests/misc/script-defer-expected.txt 
+++ /home/slave/webkitgtk/gtk-linux-64-release/build/layout-test-results/http/tests/misc/script-defer-actual.txt 
@@ -1,7 +1,9 @@
 This tests for proper execution order of scripts with the defer attribute https://bugs.webkit.org/show_bug.cgi?id=20710.
 external
 inline
+DOMContentLoaded
 slowDefer
+DOMContentLoaded
 defer
 DOMContentLoaded
 load

[Eric Seidel (no email)]

We definitely shoudl not be delivering more than one DOMContentLoaded event.  I'll look when I wake tomorrow.  I'm also happy to roll out (or have someone roll out) the patch.

[Eric Seidel (no email)]

I've found the bug.  Will fix.

[Ádám Kallai]

I skipped this flakey test on Qt.

http://trac.webkit.org/changeset/122214/trunk/LayoutTests/platform/qt/Skipped

[Eric Seidel (no email)]

Created attachment 151445 [details]
Patch

[Thiago Marcos P. Santos]

(In reply to comment #4)
> It became flakey on GTK and Qt too:
> --- /home/slave/webkitgtk/gtk-linux-64-release/build/layout-test-results/http/tests/misc/script-defer-expected.txt 
> +++ /home/slave/webkitgtk/gtk-linux-64-release/build/layout-test-results/http/tests/misc/script-defer-actual.txt 
> @@ -1,7 +1,9 @@
>  This tests for proper execution order of scripts with the defer attribute https://bugs.webkit.org/show_bug.cgi?id=20710.
>  external
>  inline
> +DOMContentLoaded
>  slowDefer
> +DOMContentLoaded
>  defer
>  DOMContentLoaded
>  load

EFL too.

[Zan Dobersek]

Comment on attachment 151445 [details]
Patch

The patch was reviewed, let's try landing it.

[WebKit Review Bot]

Comment on attachment 151445 [details]
Patch

Clearing flags on attachment: 151445

Committed r122226: <http://trac.webkit.org/changeset/122226>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.