netdev - Re: bpfilter causes a leftover kernel process

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Date:   Mon, 27 Aug 2018 20:35:02 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Olivier Brunel <jjk@...cky.com>
Cc:     netdev@...r.kernel.org, daniel@...earbox.net
Subject: Re: bpfilter causes a leftover kernel process

On Mon, Aug 27, 2018 at 06:31:22PM +0200, Olivier Brunel wrote:
> 
> So the process is required, never ends and prevents umouting the

it's not required. It's not doing anything useful at the moment
and defaults to 'n' in kconfig. Please disable it your kernel.

> rootfs on shutdown. Unless I'm missing something, there's definitely a
> bug there?

I'm also running Arch Linux in my VM, but I'm not able to reproduce umount issue.
I'm guessing it's somehow related to non-static build and libc.so being busy
with old systemd.
Typical shutdown should have done:
[   73.498022] shutdown[1]: Sending SIGTERM to remaining processes...
[   73.505501] shutdown[1]: Sending SIGKILL to remaining processes...
[   73.512783] shutdown[1]: Unmounting file systems.
And at the time of umount / no processes are alive other than systemd.