** Attachment added: "lxc-vs-old-systemd.log"
   
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1943704/+attachment/5525407/+files/lxc-vs-old-systemd.log

** Description changed:

  lxc fails 4 autopkgtests if ran on a cgroups v2 enabled systemd
  (248.3-1ubuntu7) using a pure unified hierarchy (in favor of the hybrid
  hierarchy used before).
  
  https://autopkgtest.ubuntu.com/packages/lxc
  
  FAIL: lxc-tests: lxc-test-apparmor-mount (0s)
  FAIL: lxc-tests: lxc-test-autostart (360s)
  FAIL: lxc-tests: lxc-test-no-new-privs (361s)
  FAIL: lxc-tests: lxc-test-unpriv (0s)
  
  I needed to skip the "lxc-test-exit-code" test to avoid my local autopkgtest 
to hang but that seems to be working on the Ubuntu infrastructure, so its 
probably related to my local environment:
  diff --git a/debian/tests/exercise b/debian/tests/exercise
  index 4a22f33..70231ee 100755
  --- a/debian/tests/exercise
  +++ b/debian/tests/exercise
  @@ -88,6 +88,10 @@ for testbin in lxc-test-*; do
-      echo "${testbin}" | grep -qv "\.in$" || continue
-      STRING="lxc-tests: $testbin"
-  
+      echo "${testbin}" | grep -qv "\.in$" || continue
+      STRING="lxc-tests: $testbin"
+ 
  +    # Skip some tests because for testing
  +    [ "$testbin" = "lxc-test-exit-code" ] && \
  +        ignore "$STRING" && continue
  +
-      # Some tests can't be run standalone
-      [ "$testbin" = "lxc-test-may-control" ] && continue
-  
+      # Some tests can't be run standalone
+      [ "$testbin" = "lxc-test-may-control" ] && continue
  
- Reproducer:
+ Reproducer (while being connected to the Canonical VPN, or setup another 
squid proxy):
  $ autopkgtest-buildvm-ubuntu-cloud -v -r impish
  $ autopkgtest lxc -s -U --apt-pocket=proposed=src:systemd --env 
"http_proxy=http://squid.internal:3128"; --env 
"https_proxy=http://squid.internal:3128"; --env 
"no_proxy=127.0.0.1,127.0.1.1,localhost,localdomain,novalocal,internal,archive.ubuntu.com,security.ubuntu.com,ddebs.ubuntu.com,changelogs.ubuntu.com,launchpad.net,10.24.0.0/24"
 -- qemu autopkgtest-impish-amd64.img
  
  I used "../lxc_4.0.10-0ubuntu4+wip0_amd64.changes" instead of the "lxc"
  SRCPKG name, to use a custom package, skipping the additional "lxc-test-
  exit-code" test.
+ 
+ Interestingly, the same set of tests fails if I run the test using the
+ old (non cgroups v2) systemd (248.3-1ubuntu3), i.e. by leaving out the "
+ --apt-pocket=proposed=src:systemd" parameter. Although, they fail in a
+ slightly different way (see attached lxc-vs-old-systemd.log). Running a
+ baseline test using the old systemd passed on the Ubuntu infrastructure.
+ – I cannot really explain this infra-baseline vs local-autopkgtest
+ difference... But it doesn't matter too much either, as we need to fix
+ the situation for the new (cgroupv2) enabled systemd.
  
  
  Logs (full logs attached):
  
  FAIL: lxc-tests: lxc-test-apparmor-mount (0s)
  ---
  /usr/sbin/deluser: The user `lxcunpriv' does not exist.
  ./lxc-test-apparmor-mount: 152: cannot create 
/sys/fs/cgroup/-.mount/lxctest/tasks: Permission denied
  lxc-destroy: tmp.6hX6BylHCU: tools/lxc_destroy.c: main: 242 Container is not 
defined
  umount: /sys/kernel/security/apparmor/features/mount: not mounted.
  sed: can't read /run/lxc/nics: No such file or directory
  ---
  => "./lxc-test-apparmor-mount: 152: cannot create 
/sys/fs/cgroup/-.mount/lxctest/tasks: Permission denied" seems to be 
relevant/related to unified cgroup hierarchy here.
  => fails in a different way with old (non cgroup v2) systemd, locally
- 
  
  FAIL: lxc-tests: lxc-test-autostart (21s)
  ---
  Setting up the GPG keyring
  Downloading the image index
  ERROR: Failed to download 
http://images.linuxcontainers.org//meta/1.0/index-system
  lxc-create: lxc-test-auto: lxccontainer.c: create_run_template: 1621 Failed 
to create container from template
  lxc-create: lxc-test-auto: tools/lxc_create.c: main: 319 Failed to create 
container lxc-test-auto
  FAIL
  ---
  => fails in the same way with old (non cgroup v2) systemd, locally.
  
  FAIL: lxc-tests: lxc-test-no-new-privs (22s)
  ---
  + DONE=0
  + trap cleanup EXIT SIGHUP SIGINT SIGTERM
  + '[' '!' -d /etc/lxc ']'
  + ARCH=i386
  + type dpkg
  ++ dpkg --print-architecture
  + ARCH=amd64
  + lxc-create -t download -n c1 -- -d ubuntu -r xenial -a amd64
  Setting up the GPG keyring
  Downloading the image index
  ERROR: Failed to download 
http://images.linuxcontainers.org//meta/1.0/index-system
  lxc-create: c1: lxccontainer.c: create_run_template: 1621 Failed to create 
container from template
  lxc-create: c1: tools/lxc_create.c: main: 319 Failed to create container c1
  + cleanup
  + cd /
  + lxc-destroy -n c1 -f
  lxc-destroy: c1: tools/lxc_destroy.c: main: 242 Container is not defined
  + true
  + '[' 0 -eq 0 ']'
  + echo FAIL
  FAIL
  + exit 1
  ---
  => fails in the same way with old (non cgroup v2) systemd, locally.
  
  FAIL: lxc-tests: lxc-test-unpriv (0s)
  ---
  ./lxc-test-unpriv: line 163: /sys/fs/cgroup/-.mount/lxctest/tasks: Permission 
denied
  cat: /tmp/tmp.w4zIOZHyAA: No such file or directory
  ---
  => "./lxc-test-unpriv: line 163: /sys/fs/cgroup/-.mount/lxctest/tasks: 
Permission denied" seems to be relevant/related to unified cgroup hierarchy 
here.
  => fails in a different way with old (non cgroup v2) systemd, locally.

** Tags added: update-excuse

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https://bugs.launchpad.net/bugs/1943704

Title:
  lxc fails autopkgtests on (pure) cgroups v2 enabled system

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