Bug#997006: systemd-networkd: broken/regression in unprivileged LXD container in v247

[Michael Biebl]

Control: tags -1 fixed-upstream patch
Control: fixed -1 248-1


Hello

Am 22.10.21 um 11:43 schrieb Linus Lüssing:
> Package: systemd
> Version: 247.3-6
> Severity: normal
> Tags: upstream
> X-Debbugs-Cc: linus.luessing at c0d3.blue
> 
> Hi,
> 
> We found that using systemd-networkd in an unprivileged LXD container is
> broken in systemd v247. A network or link file is not attached to an
> interface and instead "networkctl -l status eth0" shows "n/a" for the
> "Link File" and "Network File". Leading to the network interface not being
> configured at all. systemd v246 and v248/v249 work fine, so it is a
> regression specific to v247.
> 
> Bisect'ing shows that this commit introduced the bug for v247:
> 
> https://github.com/systemd/systemd/commit/88da55e28b467999da005591d3252a98f4436522
> 
> And the following commit fixed it again for v248:
> 
> https://github.com/systemd/systemd/commit/0e789e6d48046d43c50dd949a71ac56f1127bb96
> 
> Git cherry-picking 0e789e6d4 onto v247 fixes the issue (cherry-picking does
> not apply cleanly but resolving this is straight forward).

Thanks for the detailed bug report and the effort of bisecting the issue.
Marking the bug report accordingly.

> Furthermore systemd-networkd does not work if the udev package is
> missing (same symptoms, no link or network file gets attached to the
> interface).
> 
> 
> Suggestions to fix:
> 
> * Add a dependency to the systemd package for the udev package.

I don't think we want that. We deliberately do not have a udev 
dependency in systemd, as udev is not strictly needed in minimal containers.

> * Backport 0e789e6d4 to the systemd v247 package.

The patch seems reasonable and small enough to qualify for a v247 
backport and being fixed via a stable upload. I've marked it accordingly [1]

> Alternatively (or additionally) systemd v249 could be added to
> bullseye-backports, so people using Debian Bullseye could work around
> the issue by installing systemd v249.
> 

A backport of v249 (and later) for bullseye is planned in any case.

Regards,
Michael

[1] 
https://bugs.debian.org/cgi-bin/pkgreport.cgi?users=pkg-systemd-maintainers@lists.alioth.debian.org;tag=bullseye-backport;dist=bullseye

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