https://bugs.kde.org/show_bug.cgi?id=479230
--- Comment #3 from madc...@atlas.cz --- My guess is that the problem lies in integer overflow. As far as I could deduce, the transmission speeds are calculated continuously by a timer in ConnectionItem QML component. This is done by subtracting the current value of rxBytes reported by the model from prevRxBytes stored as a property of the timer. The model uses qulonglong for the values of transmitted bytes but the QML component uses 32bit ints. I don't know how exactly Qt handles 64 -> 32 bit conversions when it passes data to QML but I suspect that if the actual number of rxBytes is greater than 2^31, then RxBytes - prevRxBytes exceeds the integer range and gets clamped to 2^31. When I reproduced the problem today, value reported from "cat /sys/class/net/wlan0/statistics/rx_bytes" was 3560443876 which is greater than what a signed 32 bit integer can represent. It also explains why the issue is difficult to reproduce; the NIC must receive over 2 GiB of data for the problem to occur. -- You are receiving this mail because: You are watching all bug changes.
