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[ale] Lab Workstation Mystery
Anyone using screen, tmux or nohup??
On Wed, 2016-04-20 at 11:52 -0500, Todor Fassl wrote:
> 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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