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Subjectuser time going down on successive reads

i'm working on software that is archiving utime (and stime and some
other stuff too) of processes running in the system for later
analysis. I am reading all that data from /proc/[pid]/stat and I have
noticed that utime can actually go down on successive read (10 secs
later in this case). How is it possible? Is this a bug or I just don't
fully understand what utime is?

I have kernel if that matters.

Thanks in advance for help.

Best Regards,
Piotr Jaroszyński
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