<html><head></head><body><div>Anyone using screen, tmux or nohup? </div><div><br></div><div>On Wed, 2016-04-20 at 11:52 -0500, Todor Fassl wrote:</div><blockquote type="cite"><pre>I posted about this problem a couple of weeks ago and still have not
figured it out. The problem is that on a group of machines running
ubuntu 15.10, after a period of time, mounting home directories via NFS
hangs. Attempting to mount or unmount home directories via NFS simply
hangs. Eventually, the root filesystem getsremounted read-only and the
machine becomes unusable even as a local user. One thing I've discovered
since my first post about this is that when end-users log out, some
processes do not get killed off. The automounter can't umount the home
directory because the user still has some processes running. Eventually,
the machine has several home directories mounted via NFS for users who
are no longer logged in. I am thinking that what is happening is that
eventually this causes NFS to get wedged which in turn leads to the
kernel freaking out. Or something. Here is an example of the output from
listing the processes for a user who has logged out:
# ps -u enduser1
PID TTY TIME CMD
101794 ? 00:00:00 systemd
101795 ? 00:00:00 (sd-pam)
103049 ? 00:00:00 ibus-daemon
103057 ? 00:00:00 ibus-dconf
So frequently, even though a user has logged out days ago, the systemd
and ibus-deamon might still be running. I am thinking after enough time,
these things mess up the nfsv4 kernel module which eventually messes up
the kernel itself.
But why would logging out *not* killoff all of an end-user's processes?
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</pre></blockquote><div><span><pre>--
James P. Kinney III
Every time you stop a school, you will have to build a jail. What you
gain at one end you lose at the other. It's like feeding a dog on his
own tail. It won't fatten the dog.
- Speech 11/23/1900 Mark Twain
http://heretothereideas.blogspot.com/
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