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I have no exact steps but take a look at the CPU snapshot attached. There is 102,2% for the second thread's root method.
Created attachment 43174 [details] CPU snapshot with 102,2%
Created attachment 43445 [details] One more screenshot
fixed in trunk. added a check for overflow of % value (due to rounding errors we can have the total of slightly more than 100% - but summarized time values fit the total time value). this seems to be a simple presentation error