[Bug 1878225] Re: Please remove lxd.snap from lxd images, as it fails to seed thus failing the first boot - snapd.seeded.service waits forever (?) to have snaps seeded in LXD on s390x and arm64

[Stéphane Graber]

Go's http stack will eventually notice, but a TCP timeout can take up to
5 minutes, so the timeout in autopkgtest is nowhere near long enough to
detect that.

It's also by far not a snapd-specific thing.

apt will experience the exact same issue and would also hold up boot if
used through cloud-init.

The only reason why apt doesn't hold up boot here is because autopkgtest
has specific logic to configure its proxy. That same logic is missing
for snapd causing this issue.


So I don't think that messing with http/tcp timeouts in snapd is the right solution here.
Instead the main actionable items would be:
 - Have the autopkgtest network reject packets rather than drop them (that would have avoided this issue)
 - Have autopkgtest's proxy config logic also configure the proxy for snapd (either through unit override or through /etc/environment)

Either of those is sufficient to avoid this problem.

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Title:
  Please remove lxd.snap from lxd images, as it fails to seed thus
  failing the first boot - snapd.seeded.service waits forever (?) to
  have snaps seeded in LXD on s390x and arm64

Status in Auto Package Testing:
  Triaged
Status in cloud-images:
  Invalid
Status in snapd:
  New
Status in autopkgtest package in Ubuntu:
  Triaged
Status in lxd package in Ubuntu:
  Invalid
Status in snapd package in Ubuntu:
  Invalid

Bug description:
  lxc launch ubuntu-daily:groovy gg-test
  lxc shell gg-test
  root at gg-test:~# service snapd.seeded status
  ● snapd.seeded.service - Wait until snapd is fully seeded
       Loaded: loaded (/lib/systemd/system/snapd.seeded.service; enabled; vendor preset: enabled)
       Active: activating (start) since Tue 2020-05-12 14:14:52 UTC; 30min ago
     Main PID: 249 (snap)
        Tasks: 10 (limit: 4704)
       Memory: 11.3M
       CGroup: /system.slice/snapd.seeded.service
               └─249 /usr/bin/snap wait system seed.loaded

  May 12 14:14:52 gg-test systemd[1]: Starting Wait until snapd is fully
  seeded...

  root at gg-test:~# systemctl list-jobs 
  JOB UNIT                                 TYPE  STATE  
  132 systemd-update-utmp-runlevel.service start waiting
  119 cloud-config.service                 start waiting
  122 snapd.seeded.service                 start running
  2   multi-user.target                    start waiting
  115 cloud-init.target                    start waiting
  1   graphical.target                     start waiting
  138 snapd.autoimport.service             start waiting
  121 cloud-final.service                  start waiting

  8 jobs listed.

  root at gg-test:~# journalctl -a | pastebinit
  https://paste.ubuntu.com/p/PtdcvvdKCM/

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