On Mon, Aug 1, 2016 at 11:19 AM, Austin S. Hemmelgarn
[off-list ref] wrote:

On 2016-08-01 13:15, Chris Murphy wrote:

quoted

I've been using balance with &, and when I logout, the btrfs command
continues to flip between status D and R, just like before logout and
it appears to complete. I still get status messages of the balance
after logout, in kernel messages.

Interesting, maybe balance is explicitly white-listed?  Either that, or it
just ignores whatever signal systemd uses to kill stuff in this context (I
initially thought SIGTERM, but SIGHUP would make more sense in this
context), which wouldn't surprise me either.

I'm not aware of any program specific white listing method with
KillUserProcesses=yes. However, there is KillExcludeUsers which by
default is KillExcludeUsers=root. Everything I run as sudo appears in
top and ps as use root. So are these processes exempt? And if so, why
is btrfs scrub becoming a zombie process? I don't know if it's
appropriate, but I asked about it (no response yet), whether all
things sudo should just be moved out of the user session. In my own
head I don't associate sudo commands with my user or my user session,
and at least top and ps agree with the former, so why not have sudo'd
processes put in a different scope from the outset?


-- 
Chris Murphy