LayoutTest tiled-drawing/scrolling/fixed/four-bars-zoomed.html is a flaky failure
This test is a flaky failure on mac-wk2 debug bots
@@ -43,9 +43,9 @@
(coverage rect 0.00, 0.00 341.30 x 254.35)
(intersects coverage rect 1)
- (tile cache coverage 0, 0 341 x 445)
- (tile size 785 x 512)
- (top left tile 0, 0 tiles grid 1 x 2)
+ (tile cache coverage 0, 0 445 x 445)
+ (tile size 512 x 512)
+ (top left tile 0, 0 tiles grid 2 x 2)
(position -4.00 -4.00)
First failure according to the dashboard is ~r204892, but that change itself seems unrelated.
Marked test as flaky in http://trac.webkit.org/projects/webkit/changeset/205758
I can reproduce this 100% by simply running the test alone:
Or, it reproduces 50 times like this:
run-webkit-tests LayoutTests/tiled-drawing/scrolling/fixed/four-bars-zoomed.html --repeat 50 --no-retry -v --run-singly
The test has a 10 ms timer, which is never good in regression tests.
And if I change the timeout to 1000 ms, then the results are different yet.
Simon, is logging tile sizes meaningful at all? Are there any common techniques for deflaking tests of this kind?
Seems like the test is racing with the tile-size timer. I wonder if we could turn off dumping of the tile caches for this test.