Public bug reported:
Ubuntu 16.04 fresh install hangs when shutting down.
The system is diskless PXE-booted with a couple of nfs mounted directories
including homedir.
As I have no persistent storage whatsoever, I don't have any logs, but
in debug-shell, running journalctl -f I can see that it hangs at
[ *] (1 of 2) A stop job running for Raise Network Interfaces (10s / 1min
30s)Jun 20 20:23:05 $hostname kernel: nfs: server $nfs-ip-address not
responding, still trying
Jun 20 20:23:05 $hostname kernel: nfs: server $nfs-ip-address not responding,
still trying
Jun 20 20:23:14 $hostname kernel: nfs: server $nfs-ip-address not responding,
still trying
Jun 20 20:24:08 $hostname kernel: nfs: server $nfs-ip-address not responding,
still trying
Second job in "(1 of 2)" is thermald, turning it off does not fix the problem.
Also, this counter "(10s / 1min 30s)" stops visually updating.
server $nfs-ip-address is not responding, because, all network
interfaces are already down at this point.
I am not exactly sure why this happens. Looks like there is a wrong
ordering of shutdown of systemd services, which bring down interfaces
before something nfs-related, but I am not sure if that's the reason of
hanging.
Workaround that fixes the problem:
In /lib/systemd/system/networking.service
comment following line:
ExecStop=/sbin/ifdown -a --read-environment
** Affects: nfs-utils (Ubuntu)
Importance: Undecided
Status: New
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags: diskless hangs networking nfs reboot shutdown systemd
** Also affects: nfs-utils (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1594658
Title:
diskless setup with nfs mounted home hangs on shutdown/reboot
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