Bug#985786: systemd: should be restartable even with mounted network filesystems

[Michael Biebl]

Control: tags -1 + upstream

Am 23.03.21 um 15:05 schrieb Marc Lehmann:

> we were just debugging an issue where systemd-networkd did not restart on
> some systems, with the following error:
> 
>     Mar 23 13:29:50 cert systemd[1]: Starting Network Service...
>     Mar 23 13:29:50 cert systemd[564743]: systemd-networkd.service: Failed to set up mount namespacing: /run/systemd/unit-r...
>     Mar 23 13:29:50 cert systemd[564743]: systemd-networkd.service: Failed at step NAMESPACE spawning /lib/systemd/systemd-...
>     Mar 23 13:29:50 cert systemd[1]: systemd-networkd.service: Main process exited, code=exited, status=226/NAMESPACE
>     Mar 23 13:29:50 cert systemd[1]: systemd-networkd.service: Failed with result 'exit-code'.
>     Mar 23 13:29:50 cert systemd[1]: Failed to start Network Service.
> 
> As it turns out, this is due to an extremely fragile setup of networkd -
> essentially, it requires working network connectivity to be restartable.
> 
> In our case, the issue above (which, btw., we could only diagnose by
> strace'ing systemd as systemd gives absolutely no useful error message for
> this) was a shared network filesystem mounted as /shared. And since we
> had a network problem (that restarting networkd with a better config was
> supposed to fix), at some point accesses to /shared caused it to fail with
> ENOTCONN.
> 
> This in turn caused sysstemd to not be able to set up the private fs
> namespace, eventually causing the failure:
> 
>     [pid 564996] statx(4, "shared", AT_STATX_SYNC_AS_STAT|AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT, 0, 0x7ffdadcf3d30) = -1 ENOTCONN (Transport endpoint is not connected)
> 


Please consider raising this upstream at
https://github.com/systemd/systemd

It's very likely that upstream has some follow up questions.

I would suggest to include your strace in that upstream bug report and 
also attach your /etc/fstab.

Thanks

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