linux-kernel - Re: [PATCH] [REGRESSION] ovl: Handle ENOSYS when fileattr support is missing in lower/upper fs

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Message-ID: <CALKgVmfZdVnqMAW81T12sD5ZLTO0fp-oADp-WradW5O=PBjp1Q@mail.gmail.com>
Date:   Mon, 6 Mar 2023 17:12:41 -0800
From:   Jonathan Katz <jkatz@...mlabs.org>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     Christian Kohlschütter 
        <christian@...lschutter.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        overlayfs <linux-unionfs@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] [REGRESSION] ovl: Handle ENOSYS when fileattr support is
 missing in lower/upper fs

Hi all,

In pursuing this issue, I downloaded the kernel source to see if I
could debug it further.  In so doing, it looks like Christian's patch
was never committed to the main source tree (sorry if my terminology
is wrong).  This is up to and including the 6.3-rc1.  I could also
find no mention of the fix in the log.

I am trying to manually apply this patch now, but, I am wondering if
there was some reason that it was not applied (e.g. it introduces some
instability?)?

Thank you,
Jonathan



On Thu, Feb 23, 2023 at 3:11 PM Jonathan Katz <jkatz@...mlabs.org> wrote:
>
> Hi all,
>
> Problem persists with me with 6.2.0
> # mainline --install-latest
> # reboot
>
> # uname -r
> 6.2.0-060200-generic
>
>
> Representative log messages when mounting:
> Feb 23 22:50:43 instance-20220314-1510-fileserver-for-overlay kernel:
> [   44.641683] overlayfs: null uuid detected in lower fs '/', falling
> back to xino=off,index=off,nfs_export=off.
>
>
>
> Representative log messages when accessing files:
> eb 23 23:06:31 instance-20220314-1510-fileserver-for-overlay kernel: [
>  992.505357] overlayfs: failed to retrieve lower fileattr (8020
> MeOHH2O RecoverySample2-20221219-A-JJL-WebinarHilic10C-TOF-TT54-Neg-1722.d/Storage.mcf_idx,
> err=-38)
> Feb 23 23:06:32 instance-20220314-1510-fileserver-for-overlay kernel:
> [  993.523712] overlayfs: failed to retrieve lower fileattr (8020
> MeOHH2O RecoverySample2-20221219-A-JJL-WebinarHilic10C-TOF-TT54-Neg-1722.d/Storage.mcf_idx,
> err=-38)
>
>
> On Mon, Jan 30, 2023 at 11:27 AM Jonathan Katz <jkatz@...mlabs.org> wrote:
> >
> > On Thu, Jan 26, 2023 at 5:26 AM Miklos Szeredi <miklos@...redi.hu> wrote:
> > >
> > > On Wed, 18 Jan 2023 at 04:41, Jonathan Katz <jkatz@...mlabs.org> wrote:
> > >
> > > > I believe that I am still having issues occur within Ubuntu 22.10 with
> > > > the 5.19 version of the kernel that might be associated with this
> > > > discussion.  I apologize up front for any faux pas I make in writing
> > > > this email.
> > >
> > > No need to apologize.   The fix in question went into v6.0 of the
> > > upstream kernel.  So apparently it's still missing from the distro you
> > > are using.
> >
> > Thank you for the reply! ---  I have upgraded the Kernel and it still
> > seems to be throwing errors.  Details follow:
> >
> > Distro: Ubuntu 22.10.
> > Upgraded kernel using mainline (mainline --install-latest)
> >
> > # uname -a
> > Linux instance-20220314-1510-fileserver-for-overlay
> > 6.1.8-060108-generic #202301240742 SMP PREEMPT_DYNAMIC Tue Jan 24
> > 08:13:53 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
> >
> > On mount I still get the following notice in syslog (representative):
> > Jan 30 19:11:46 instance-20220314-1510-fileserver-for-overlay kernel:
> > [   71.613334] overlayfs: null uuid detected in lower fs '/', falling
> > back to xino=off,index=off,nfs_export=off.
> >
> > And on access (via samba) I still see the following errors in the
> > syslog (representative):
> > Jan 30 19:19:34 instance-20220314-1510-fileserver-for-overlay kernel:
> > [  539.181858] overlayfs: failed to retrieve lower fileattr (8020
> > MeOHH2O RecoverySample2-20221219-A-JJL-WebinarHilic10C-TOF-TT54-Neg-1722.d/Storage.mcf_idx,
> > err=-38)
> >
> > And on the Windows client, the software still fails with the same symptomology.
> >
> >
> >
> >
> > >
> > > > An example error from our syslog:
> > > >
> > > > kernel: [2702258.538549] overlayfs: failed to retrieve lower fileattr
> > > > (8020 MeOHH2O
> > > > RecoverySample2-20221219-A-JJL-WebinarHilic10C-TOF-TT54-Neg-1722.d/analysis.tsf,
> > > > err=-38)
> > >
> > > Yep, looks like the same bug.
> > >
> > > Thanks,
> > > Miklos