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bbfa235
(Get the code!)
`shutdown now` executes poweroff command which in systemd signals manpage documented as:
SIGRTMIN+4 Powers off the machine, starts the poweroff.target unit. This is mostly equivalent to systemctl start poweroff.target.
The logs indicate that lxc is sending
SIGRTMIN+3 Halts the machine, starts the halt.target unit. This is mostly equivalent to systemctl start halt.target.
Note that in addition to above, systemd have more immediate variants for these:
SIGRTMIN+13 Immediately halts the machine.
SIGRTMIN+14 Immediately powers off the machine.
Could you please start the affected containter and try `shutdown --halt now` and check if that hangs as well?