[systemd-devel] Antw: Re: Antw: Re: Antw: failing unmounts during reboot

[Lennart Poettering]

On Mo, 29.07.19 14:08, Ulrich Windl (Ulrich.Windl at rz.uni-regensburg.de) wrote:

> >> And just repeating the unmount without further actions is not a
> >> hack?
> >
> > Hmm? we tend to give up when we can't unmount something, log about it
> > and go on. We also have a second shutdown phase, which is a dumb and
> > brutal kill/umount loop that kills remaining processes and removes
> > mounts in a tight loop until nothing changes anymore. This second
> > phase is a safety net only though: it takes care of stuff that somehow
> > survive the first phase, i.e. the clean phase.
> >
> >> Why not stop when unmount fails?
> >
> > We do that.
>
> But it seems to be a better idea for the second phase to kill processes
> blocking unmount.

Hmm? The second phase kills *all* processes still remaining, in a
tight loop, under the assumption this will unblock mounts. When it
notices that doing so doesn#t help it eventually gives up too...

But again, the second phase is just a safety net, it should only get
involved if there are issues with the first phase. If the first phase
works correctly the second phase does exactly nothing anymore.

Lennart

--
Lennart Poettering, Berlin