#68595 - VLANs in static-networking-service-type hangs shepherd

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From: Ludovic Courtès <ludo@gnu.org>
To: Lars Rustand <rustand.lars@gmail.com>
Subject: Re: bug#68595: VLANs in static-networking-service-type hangs shepherd
In-Reply-To: <87v87pc7ul.fsf@yoga.mail-host-address-is-not-set> (Lars
 Rustand's message of "Fri, 19 Jan 2024 20:12:24 +0100")
References: <87v87pc7ul.fsf@yoga.mail-host-address-is-not-set>
Date: Mon, 12 Feb 2024 10:55:32 +0100
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Cc: 68595@debbugs.gnu.org, Julien Lepiller <julien@lepiller.eu>,
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Hi,

Lars Rustand <rustand.lars@gmail.com> skribis:

> Like the title says, if you add any VLAN in a
> static-networking-service-type it seems like the whole shepherd daemon
> freezes up and anything that depends on it stops responding.
> Additionally the networking does not get fully configured either.
>
> After configuring a VLAN `herd status`, `herd restart networking` and
> any other herd command hangs forever with no output. Even reboot is not
> working. The only remedy is to restart the system using the power
> button, but even after the restart the networking service still fails to
> start.

Ouch.  Could you check what /var/log/messages reports?

Once you’ve reproduced the hang, could you attach GDB to shepherd and
get a backtrace?

  gdb -p 1
  bt

(I recommend doing that in a VM rather than on your main machine!)

> 1. Add a static network with a VLAN to your system config (see below for
> minimal example)
> 2. Reconfigure your system
> 3. Restart the networking service with `sudo herd restart networking`
> 4. Observe that herd does not finish
> 5. Try to run `herd status`, `guix system reconfigure`, or `sudo reboot`.
> 6. Observe that none of the commands seem to have any effect, and that
> they hang indefinitely with no output
>
> (service static-networking-service-type
>   (list (static-networking
>          (links
>           (list (network-link
>                  (name "myvlan")
>                  (type 'vlan)
>                  (arguments '((id . 3)
>                               (link . "eth0"))))))
>          (addresses
>           (list (network-address
>                  (device "myvlan@eth0")
>                  (value "192.168.0.2/24")))))))

You mentioned in your other message that the example from the manual
works fine.  Could you try and reduce your config until you find which
bit makes it fail?

Cc’ing Alexey and Julien who may know more.

Thanks,
Ludo’.

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#68595 VLANs in static-networking-service-type hangs shepherd