Date: Wed, 20 Aug 2014 13:52:41 -0700 From: Dieter BSD <dieterbsd@gmail.com> To: freebsd-hackers@freebsd.org Subject: Re: stopped processes using cpu? Message-ID: <CAA3ZYrBRTkZppn26nv2w17mgXN-38N6t5hqy4bhKX2AR8s6xEA@mail.gmail.com>
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> whether or not the existing code is good or bad
It has been awhile since I've looked at the code for firefox, but
that code was OBSCENELY bad. :-( I fixed hundreds and hundreds and
hundreds of bugs (yes, that many!) and it still didn't work (at all).
The firefox idiots didn't believe my bug report.
Code quality of top/ps/kernel? Look at the code and/or see how many
open PRs there are.
Firefox runs in a chroot, executables in a read-only partition.
/etc/profile has
ulimit -S -m 400000
ulimit -S -v 600000
after an incident where an "idle" firefox grew without bound kicking
everything else out of memory including a small program running at rtprio
logging true real-time data resulting in the loss of data. (the data buffer
was mlocked, but the code wasn't. Silly me thinking that the kernel
wouldn't page out a small loop that is constantly running.)
Firefox is usually stopped when not being actively used. No plugins.
Other web browsers (smaller, faster, more secure, less buggy, ...)
are used whenever possible.
Rootkit? Perhaps possible in theory, but very highly unlikely.
CPU% decays as expected when processes are stopped (except for firefox).
Firefox CPU% does not decay as expected, either running or stopped.
I tried running a cpu-bound process in the same chroot as firefox,
it decayed as expected when stopped.
So firefox seems to be the only thing that this shows up on.
And also seems to be the only thing with THR > 1.
So try the -H option:
PID UID PRI NICE SIZE RES STATE TIME WCPU COMMAND
92986 941 54 0 167M 63524K STOP 0:00 5.03% {firefox-bin}
92986 941 4 0 167M 63524K STOP 0:25 0.00% {initial thread}
92986 941 44 0 167M 63524K STOP 0:01 0.00% {firefox-bin}
92986 941 44 0 167M 63524K STOP 0:00 0.00% {firefox-bin}
92986 941 44 0 167M 63524K STOP 0:00 0.00% {firefox-bin}
92986 941 44 0 167M 63524K STOP 0:00 0.00% {firefox-bin}
92986 941 44 0 167M 63524K STOP 0:00 0.00% {firefox-bin}
33796 941 44 0 5248K 1200K ttyin 0:00 0.00% bash
92986 941 44 0 167M 63524K STOP 0:00 0.00% {firefox-bin}
92986 941 44 0 167M 63524K STOP 0:00 0.00% {firefox-bin}
92979 941 48 0 6184K 632K STOP 0:00 0.00% sh
92983 941 62 0 6208K 660K STOP 0:00 0.00% sh
92978 941 44 0 8296K 1372K STOP 0:00 0.00% sh
PID UID PRI NICE SIZE RES STATE TIME WCPU COMMAND
44188 937 4 0 303M 187M STOP 104:11 12.65% {initial thread}
44188 937 44 0 303M 187M STOP 0:45 0.49% {firefox-bin}
44188 937 44 0 303M 187M STOP 8:19 0.29% {firefox-bin}
44188 937 44 0 303M 187M STOP 0:02 0.00% {firefox-bin}
44188 937 44 0 303M 187M STOP 0:01 0.00% {firefox-bin}
44188 937 44 0 303M 187M STOP 0:01 0.00% {firefox-bin}
44188 937 44 0 303M 187M STOP 0:00 0.00% {firefox-bin}
44188 937 44 0 303M 187M STOP 0:00 0.00% {firefox-bin}
44167 937 44 0 5248K 804K ttyin 0:00 0.00% bash
44181 937 76 0 6184K 632K STOP 0:00 0.00% sh
44185 937 76 0 6208K 664K STOP 0:00 0.00% sh
44188 937 60 0 303M 187M STOP 0:00 0.00% {firefox-bin}
Any clues there?
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