TEST-13-NSPAWN-SMOKE seems to be failing

[evverx]

Either systemd-nspawn or TEST-13-NSPAWN-SMOKE seems to be broken.

+ systemd-nspawn --register=no -D /var/lib/machines/unified-no-cgns-no-api-vfs-writable-yes --network-namespace-path=/proc/self/ns/net --private-network -b
--network-namespace-path cannot be combined with other network options.
+ ip netns add nspawn_test
+ _netns_opt=--network-namespace-path=/run/netns/nspawn_test
+ grep -v -E '^1: lo.*UP'
+ UNIFIED_CGROUP_HIERARCHY=no
+ SYSTEMD_NSPAWN_USE_CGNS=no
+ SYSTEMD_NSPAWN_API_VFS_WRITABLE=yes
+ systemd-nspawn --register=no -D /var/lib/machines/unified-no-cgns-no-api-vfs-writable-yes --network-namespace-path=/run/netns/nspawn_test /bin/ip a
Found cgroup2 on /sys/fs/cgroup/unified, unified hierarchy for systemd controller
Spawning container unified-no-cgns-no-api-vfs-writable-yes on /var/lib/machines/unified-no-cgns-no-api-vfs-writable-yes.
Press ^] three times within 1s to kill container.
Path /run/netns/nspawn_test doesn't refer to a network namespace

The full log can be found at https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-artful-pitti-systemd-semaphore/artful/amd64/s/systemd-upstream/20180321_231945_37893@/log.gz