cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=34,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=9430)
mqueue on /dev/mqueue type mqueue (rw,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)
tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=401072k,mode=700)
tmpfs on /run/netns type tmpfs (rw,nosuid,noexec,relatime,size=401076k,mode=755)
nsfs on /run/netns/test type nsfs (rw)
root@localhost:~# ip netns delete test
Cannot remove namespace file "/var/run/netns/test": Device or resource busy
root@localhost:~# umount --force /run/netns/test
umount: /run/netns/test: not mounted
netns 20 root cwd DIR 8,17 4096 2 /
netns 20 root rtd DIR 8,17 4096 2 /
netns 20 root txt unknown /proc/20/exe
root 20 0.0 0.0 0 0 ? S< 06:11 0:00 [netns]
root 21 0.0 0.0 0 0 ? S 06:11 0:00 [khungtaskd]
O que eu faço para corrigir isso? Parece que netns
é o único usuário desse ponto de montagem? Devo / posso matar o fio?