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Containers: after command "reboot" the host system will reboot after 1.5 minutes
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Description

To reproduce add any container and reboot the host system.

set container name busybox allow-host-networks
set container name busybox image 'busybox'
vyos@r1-roll:~$ reboot now
Connection to 192.168.122.11 closed by remote host.
Connection to 192.168.122.11 closed.
sever@sever:~$ ping 192.168.122.11
PING 192.168.122.11 (192.168.122.11) 56(84) bytes of data.
64 bytes from 192.168.122.11: icmp_seq=1 ttl=64 time=0.208 ms
64 bytes from 192.168.122.11: icmp_seq=2 ttl=64 time=0.225 ms
64 bytes from 192.168.122.11: icmp_seq=3 ttl=64 time=0.245 ms
64 bytes from 192.168.122.11: icmp_seq=4 ttl=64 time=0.215 ms
64 bytes from 192.168.122.11: icmp_seq=5 ttl=64 time=0.170 ms
64 bytes from 192.168.122.11: icmp_seq=6 ttl=64 time=0.210 ms
...
...
64 bytes from 192.168.122.11: icmp_seq=77 ttl=64 time=0.154 ms
64 bytes from 192.168.122.11: icmp_seq=78 ttl=64 time=0.324 ms
64 bytes from 192.168.122.11: icmp_seq=79 ttl=64 time=0.179 ms
64 bytes from 192.168.122.11: icmp_seq=80 ttl=64 time=0.193 ms
64 bytes from 192.168.122.11: icmp_seq=81 ttl=64 time=0.207 ms
64 bytes from 192.168.122.11: icmp_seq=82 ttl=64 time=0.149 ms
From 192.168.122.1 icmp_seq=93 Destination Host Unreachable
From 192.168.122.1 icmp_seq=94 Destination Host Unreachable
From 192.168.122.1 icmp_seq=95 Destination Host Unreachable
From 192.168.122.1 icmp_seq=96 Destination Host Unreachable

After about one and a half minutes, the system will reboot

A possible reason then containers created from VyOS CLI can't correctly handle SIGTERM signal (or just ignore it) to process "pid 1"
After sending SIGTERM it waits 1.5 min and then send SIGKILL, only after this the system is going into reboot.

Details

Difficulty level
Normal (likely a few hours)
Version
VyOS 1.4-rolling-202109300217
Why the issue appeared?
Will be filled on close
Is it a breaking change?
Unspecified (possibly destroys the router)
Issue type
Bug (incorrect behavior)