tags 628617 - moreinfo
thanks
> I've tried various process and values for the process_age_sec and I
> have been able to get that warning. Are you still getting this and what
> sort of things are you trying to kill?
Erm, processes? :)
The problem is that killall asserts that the age of a process, as a
floating-point number of seconds, must always be greater than zero.
However, that value has a resolution of one jiffy[*], so it may very
well be equal to zero if a process was launched within the same time
slice as the call to process_age(). (Actually, as the value is obtained
by substracting two floating-point values, it sometimes falls slightly
below zero.)
You may attempt to trigger this bug yourself by launching a bunch of
short-lived processes. In one terminal, run:
$ while true; do sleep 5s; done 2> /dev/null
And in another:
$ while true; do killall sleep --younger-than 5s | cat ; done
Whether or not this works for you will depend on your particular
machine. I myself had great success on virtual machines (Xen and
VirtualBox), none at all on an small Atom box, and it was hit-and-miss
on my desktop. (For some reason, the pipe to cat helped.)
[*] So says proc(5), but it's actually 0.01s here, despite CONFIG_HZ=250
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