[Webkit-unassigned] [Bug 47966] New: fast/css/long-css-selector-matches.html test causes TIMEOUT in some platforms

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=47966

           Summary: fast/css/long-css-selector-matches.html test causes
                    TIMEOUT in some platforms
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hayato at chromium.org


The objective of fast/css/long-css-selector-matches.html test is whether stack overflow happens or not if a long css selector is used.
To make stack overflow happen in old implementation of CSSStyleSelector, we had to increase a CSS selector's depth level at some level. But that increases a execution time of that test.

So we have a dilemma.

The more and more we increate a depth level, stack overflow becomes to happen more likely in bad implementation, but a timeout of test becomes to happen more likely in some platforms.
In fact, the test in chromium in test_shell causes TIMEOUT, so we had to mark that test 'PASS TIMEOUT' in chromium/test_expectations.txt: https://trac.webkit.org/changeset/70123.

It is not ideal situation that marking it 'PASS TIMEOUT' in only some platforms.
We have to come to compromise about a depth level so that it doesn't cause TIMEOUT.

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