[Webkit-unassigned] [Bug 120963] New: REGRESSION: Lots of reftests fail with singe line or single pixel differences

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=120963

           Summary: REGRESSION: Lots of reftests fail with singe line or
                    single pixel differences
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ap at webkit.org
                CC: simon.fraser at apple.com, rniwa at webkit.org,
                    benjamin at webkit.org, thorton at apple.com


See e.g. <http://build.webkit.org/results/Apple%20MountainLion%20Release%20WK1%20(Tests)/r155249%20(12626)/results.html> - there are lots of tests that are marked flaky because they failed on first run and passed on second run. It's most noticeable on fast/regions and multicolumn tests, but it's not limited to these.

I've been looking into this for a while, and I couldn't find any way to reproduce locally short of running the whole test suite, and even that is not 100% reliable.

So far, I could reproduce locally with r155076, and couldn't with r155065, r155064 or r155056. But there seems to be absolutely nothing suspicious between r155065 and r155076.

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