[Webkit-unassigned] [Bug 46978] [Qt] The scrolling benchmark crashes on Maemo 5 with QtWebKit 2.1

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Oct 8 05:58:31 PDT 2010


Benjamin Poulain <benjamin.poulain at nokia.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #5 from Benjamin Poulain <benjamin.poulain at nokia.com>  2010-10-08 05:58:31 PST ---
I finally solved this thing. The problem was in Qt, the patch is in the commit 4d974ff0a748b22e668a4cb7ef38101122c85b3b

To summarize what was going on:
-the gif plugin decode a frame
-the gif plugin keep a reference to this frame for future usage
-because of the bug, in-place conversion took place on the image returned by the plugin, which is also the one kept by the plugin
-because the color space is 16 bits on device, the in-place conversion half the memory allocated
-when WebKit need the next image, the gif plugin reuse the cached image, and write out of the memor since the conversion reduced it.

-after some time writing outside the memory bounds, the memory is so messed up we end up with random crashes in WebCore.

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