Comment 21 for bug 806248

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Rickard Westman (rwestman) wrote : Re: Launcher icons are all rendered up in top left corner

I have seen this problem three times now with Ubuntu 11.04, and the uptime was 24 days plus an unknown number of hours each time. The last time it happened, I was actually at the computer at the time, and the uptime was 24 days, 21 hours, and 5 minutes when I noticed the messed-up launcher. (I was writing an email and probably noticed within 15 minutes or so.)

The description in #20 sounds awfully much like some kind of signed tick counter overflowing into its negative range, with some other code not handling that properly until the counter gets into the positive range again. A signed 32-bit millisecond counter goes into negative territory after 2147483648 ms which is 24 days, 20 hours, and 31 minutes. This is close enough to my latest uptime observation that I suspect it's not a coincidence...