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Groups > linux.debian.kernel > #84863

Bug#1089976: nfs-kernel-server: Fails to start - segmentation fault

Cross-posted to 2 groups.

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Hi Bill,

On Mon, Dec 16, 2024 at 06:30:07PM -0800, Bill Brelsford wrote:
> Hi Salvatore,
> 
> On Mon Dec 16 2024 at 09:36 PM +0100, Salvatore Bonaccorso wrote:
> > What is commont on thoe system where you see the failure? Are all not
> > using systemd as init? Additionally can you give some more details on
> > your setup, how the exports look? Can we boild down the setup
> > minimally to trigger the issue (and so report upstream)?
> 
> The other system is an old one that I maintain as a backup; it also
> uses sysvinit. The nfs setup for both is simple, with no changes to
> /etc/nfs.conf or /etc/default/nfs-kernel-server. /etc/exports on
> the newer system:
> 
>    / 10.20.40.80/29(rw,fsid=8208,no_root_squash,no_subtree_check,sync)
>    /u 10.20.40.80/29(rw,fsid=8202,no_root_squash,no_subtree_check,sync)
>    /u1 10.20.40.80/29(rw,fsid=8203,no_root_squash,no_subtree_check,sync)
>    /n/ws 10.20.40.80/29(rw,fsid=8206,no_root_squash,no_subtree_check,sync)
>    /n/wt 10.20.40.80/29(rw,fsid=8207,no_root_squash,no_subtree_check,sync)
> 
> It had been working fine on both systems prior to the 2.8.2-1
> upgrade. It also works on 5 bookworm systems with the same setup.

Thanks. Unfortunately still no look in a lab setup to trigger your
issue. When rpc.segfaults, are there any other nfs related processed
and threads running on the system?

> > Can you additionally please test to downgrade to the 2.8.1-2 version
> > and please report back if you see the problem there was well? For us
> > it should behave actually same as 2.8.1-1 but I would like to double
> > check.
> 
> I downgraded to 2.8.1-1 because it was available in the trixie
> repository. Where can I get 2.8.1-2?

It is not anymore available in the archive as it is superseeded. But
you can find it on snapshot.d.o:

https://snapshot.debian.org/package/nfs-utils/1%3A2.8.1-2/


> 
> I also have trixie installed on both systems. Trixie now uses
> 2.8.2-1 so I upgraded one of them -- it also fails.
> 
> > the supported way is to run it with systemd, the ship'ed sysvinit
> > scripts contain legacy, for instance with new version we would start
> > the server with nfsdctl:
> > 
> > ExecStart=/bin/sh -c '/usr/sbin/nfsdctl autostart || /usr/sbin/rpc.nfsd'
> > 
> > If you start it through nfsdctl do you get the exports working?
> 
> I haven't installed systemd -- nothing I use has required it -- so
> nfsdctl isn't available.

nfsdctl is independent of systemd, it is shipped in as the new
tool(ing) for starting the nfsd server:

/usr/sbin/nfsdctl from nfs-kernel-server package.

> > Still, having more information on the underlying setup would be
> > helpful.
> 
> Another possible clue: after upgrading (to 2.8.2-1), there is no
> problem -- I can start and stop the daemon, export/unexport
> filesystems, etc.  Everything seems normal -- until the system is
> rebooted and rpc.nfsd is invoked.

As for the first part: What processes and kernel threads are started
on the system at this stage?

Regards,
Salvatore

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Thread

Bug#1089976: nfs-kernel-server: Fails to start - segmentation fault Bill Brelsford <wb@k2di.net> - 2024-12-15 02:30 +0100
  Processed: Re: Bug#1089976: nfs-kernel-server: Fails to start -  segmentation fault "Debian Bug Tracking System" <owner@bugs.debian.org> - 2024-12-15 14:20 +0100
  Bug#1089976: nfs-kernel-server: Fails to start - segmentation fault Salvatore Bonaccorso <carnil@debian.org> - 2024-12-15 14:20 +0100
    Bug#1089976: nfs-kernel-server: Fails to start - segmentation fault Bill Brelsford <wb@k2di.net> - 2024-12-16 04:30 +0100
      Bug#1089976: nfs-kernel-server: Fails to start - segmentation fault Salvatore Bonaccorso <carnil@debian.org> - 2024-12-16 21:40 +0100
        Bug#1089976: nfs-kernel-server: Fails to start - segmentation fault Bill Brelsford <wb@k2di.net> - 2024-12-17 03:40 +0100
          Bug#1089976: nfs-kernel-server: Fails to start - segmentation fault Salvatore Bonaccorso <carnil@debian.org> - 2024-12-17 23:20 +0100
            Bug#1089976: nfs-kernel-server: Fails to start - segmentation fault Bill Brelsford <wb@k2di.net> - 2024-12-19 06:50 +0100
              Bug#1089976: nfs-kernel-server: Fails to start - segmentation fault Bill Brelsford <wb@k2di.net> - 2024-12-19 16:30 +0100
                Bug#1089976: nfs-kernel-server: Fails to start - segmentation fault Bill Brelsford <wb@k2di.net> - 2025-01-15 03:00 +0100
                Bug#1089976: nfs-kernel-server: Fails to start - segmentation fault Salvatore Bonaccorso <carnil@debian.org> - 2025-01-15 07:20 +0100
  Processed: Re: Bug#1089976: nfs-kernel-server: Fails to start -  segmentation fault "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-01-16 09:40 +0100
  Bug#1089976: nfs-kernel-server: Fails to start - segmentation fault Salvatore Bonaccorso <carnil@debian.org> - 2025-01-16 09:40 +0100
    Bug#1089976: nfs-kernel-server: Fails to start - segmentation fault Bill Brelsford <wb@k2di.net> - 2025-01-17 04:30 +0100

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