netdev - Re: bpfilter causes a leftover kernel process

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Message-ID: <CAADnVQ+xFfwV67BRXD0epoTwKz54W3mcYHXVWBd1iWb94p+zpg@mail.gmail.com>
Date:   Tue, 16 Oct 2018 16:38:56 +0000
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Olivier Brunel <jjk@...cky.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: bpfilter causes a leftover kernel process

On Wed, Sep 5, 2018 at 5:05 PM Olivier Brunel <jjk@...cky.com> wrote:
>
> You'll see in the end that systemd complains that it can't
> unmount /oldroot (EBUSY), aka the root fs; and that's because of the
> bpfilter helper, which wasn't killed because it's seen as a kernel
> thread due to its empty command line and therefore not signaled.

thanks for tracking it down.
can somebody send a patch to give bpfilter non-empty cmdline?
I think that would be a better fix than tweaking all pid1s.