One more update: I verified that the steps from comment #17 can be used
to reproduce the issue in an Ubuntu Core image started in qemu, and
without using the spread. I verified it with the 20211105 image provided
by Lukas in https://people.ubuntu.com/~slyon/uc18/
To reproduce it, start the image in QEMU:
qemu-system-x86_64 -enable-kvm -smp 2 -m 1500 \
-netdev user,id=mynet0,hostfwd=tcp::8022-:22,hostfwd=tcp::8090-:80 \
-device virtio-net-pci,netdev=mynet0 \
-drive file=~/Downloads/uc18-20211105+systemd+3G.img,format=raw \
-drive
file=/usr/share/OVMF/OVMF_CODE.fd,if=pflash,format=raw,unit=0,readonly=on
configure it as usual, and install a snap. Then:
sudo snap install hello-world
sudo systemctl start 'snap-hello\x2dworld-29.mount'
sudo systemctl daemon-reload
sudo systemctl stop 'snap-hello\x2dworld-29.mount'
sudo systemctl start 'snap-hello\x2dworld-29.mount'
The last command will hang for 90 seconds, after which the logs (`sudo
journalctl -xe`) will say:
```
Nov 15 06:10:20 localhost systemd[1]: dev-loop6.device: Job
dev-loop6.device/start timed out.
Nov 15 06:10:20 localhost systemd[1]: Timed out waiting for device /dev/loop6.
-- Subject: Unit dev-loop6.device has failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit dev-loop6.device has failed.
--
-- The result is RESULT.
Nov 15 06:10:20 localhost systemd[1]: Dependency failed for Mount unit for
hello-world, revision 29.
-- Subject: Unit snap-hello\x2dworld-29.mount has failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit snap-hello\x2dworld-29.mount has failed.
--
-- The result is RESULT.
Nov 15 06:10:20 localhost systemd[1]: snap-hello\x2dworld-29.mount: Job
snap-hello\x2dworld-29.mount/start failed with result 'dependency'.
Nov 15 06:10:20 localhost systemd[1]: dev-loop6.device: Job
dev-loop6.device/start failed with result 'timeout'.
```
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https://bugs.launchpad.net/bugs/1949089
Title:
systemd randomly fails to activate mount units in Ubuntu Core 18
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