[Filesystems-devel] Bug#884008: Bug#884008: aufs-dkms: aufs triggers kernel WARN during boot

[sfjro at users.sourceforge.net]

(removed aufs-users ML from Cc:)

Ralf Jung:
> Oh wow, that's a long list...

Thanx for the report, anyway.


> > - linux kernel version
> >   if your kernel is not plain, for example modified by distributor,
> >   the url where i can download its source is necessary too.
>
> Linux core.hacksaar.de 4.9.0-4-amd64 #1 SMP Debian 4.9.65-3 (2017-12-03)
> x86_64 GNU/Linux
>
> The source download is at the bottom of
> <https://packages.debian.org/source/stable/linux>

Hmm, I checked linux-image-4.9.0-4-amd64 pkg and downloaded its
linux_4.9.65-3.debian.tar.xz, I could not find aufs source files.


> > - aufs version which was printed at loading the module or booting the
> >   system, instead of the date you downloaded.
>
> > Dez 10 12:10:24 core.hacksaar.de kernel: aufs: loading out-of-tree module taints kernel.
> > Dez 10 12:10:24 core.hacksaar.de kernel: aufs 4.9-20161219

While this version is very old (a year ago), the info is enough to
identify the source files (with assuming debian people didn't change
them).


> > S Sun Dec 10 12:10:27 2017 p4 kernel: WARNING: CPU: 0 PID: 1490 at /var/lib/dkms/aufs/4.9+20161219/build/fs/aufs/cpup.c:423 au_cp_regular+0x16c/0x250 [aufs]
> > S Sun Dec 10 12:10:27 2017 p4 kernel: .wh..wh.setup_maker_elements-i.ri.0007
> > Please report this warning to aufs-users ML

This is an unexpected situation for aufs. It might be related to your
environment (xen domU?). The period (10sec) this warning is appearing,
the performance of the internal file-close operation may get worse a
little bit. But it is harmless. You can ignore this warning safely.

I know it must be annoying for you, and I am going to comment it out in
next release. Your report is helpful for me to know the case where this
warning appears.


By the way, I see all your branches are under "/dev/xvda1
/var/lib/docker/aufs ext4", it is ok. But what for is
"shm /var/lib/docker/containers/2b0cb..."?
Is it totally unused?


----------------------------------------------------------------------
From: Ralf Jung <post at ralfj.de>
Date: Wed, 13 Dec 2017 22:54:08 +0100

FWIW, my message got rejected from aufs-users.  I'm not really
interested in receiving that list, is there no other way to report a bug?

aufs-users ML is members only. I expect you to join the ML before you
post. I can understand you don't want to. And... there is no other way,
sorry.


Thank you
J. R. Okajima