[Webkit-unassigned] [Bug 13183] New: 100% CPU (but no beachball) when loading Gmail

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=13183

           Summary: 100% CPU (but no beachball) when loading Gmail
           Product: WebKit
           Version: 522+ (nightly)
          Platform: Macintosh PowerPC
               URL: http://mail.google.com/mail/
        OS/Version: Mac OS X 10.4
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Page Loading
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: akan at apple.com


On my G4 450 MHz Cube, WebKit CPU usage goes to 100% and stays there once the
page is almost loaded (the black "Loading..." on the left side has already
disappeared and only the red-on-white "Loading..." box on the right remains).
Page loading then appears to make no forward progress. Sharking WebKit at this
point shows a lot of time spent in WebCore::TimerBase::sharedTimerFired(),
which seems to consist mostly of CoreFoundation timer adding and invalidation.

This appears to have started sometime between r20387 and r20419, from my
testing with the builds on nightly.webkit.org, and doesn't happen on my MBP
with the same builds. On my Cube, it also happens sporadically with other
webpages, but not with the same reproducibility of Gmail (i.e. I can get pages
to load eventually if I stop and reload). I don't have another PPC machine here
to reproduce this with, unfortunately.


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