[Bug 2046495] Re: test-execute fails in LXD with failure in exec-privatenetwork-yes-privatemounts-yes.service

[Nick Rosbrook]

I think this test will just need to remain skipped. Since systemd gets
-EPERM when trying to mount the private sysfs, it just takes some
fallback code and re-uses the existing sysfs, which means that dummy-
test-exec will still be accessible through sysfs. I can't currently
think of a good way to generalize a patch for upstream, so we will
probably just keep this in Ubuntu only.

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Title:
  test-execute fails in LXD with failure in exec-privatenetwork-yes-
  privatemounts-yes.service

Status in systemd package in Ubuntu:
  New

Bug description:
  This is in v255. This log snippet is taken from a local autopkgtest
  build:

  exec-privatenetwork-yes-privatemounts-yes.service: Will spawn child (service_enter_start): /bin/sh
  exec-privatenetwork-yes-privatemounts-yes.service: Failed to set 'trusted.invocation_id' xattr on control group /system.slice/test-execute-48e27182b3724b7.scope/99d288e6f11f869e/system.slice/exec-privatenetwork-yes-privatemounts-yes.service, ignoring: Operation not permitted
  exec-privatenetwork-yes-privatemounts-yes.service: Failed to remove 'trusted.delegate' xattr flag on control group /system.slice/test-execute-48e27182b3724b7.scope/99d288e6f11f869e/system.slice/exec-privatenetwork-yes-privatemounts-yes.service, ignoring: Operation not permitted
  exec-privatenetwork-yes-privatemounts-yes.service: Failed to remove 'trusted.survive_final_kill_signal' xattr flag on control group /system.slice/test-execute-48e27182b3724b7.scope/99d288e6f11f869e/system.slice/exec-privatenetwork-yes-privatemounts-yes.service, ignoring: Operation not permitted
  exec-privatenetwork-yes-privatemounts-yes.service: Passing 0 fds to service
  exec-privatenetwork-yes-privatemounts-yes.service: About to execute: /bin/sh -x -c "! ip link show dummy-test-exec"
  Serializing sd-executor-state to memfd.
  exec-privatenetwork-yes-privatemounts-yes.service: Forked /bin/sh as 5092
  Closing set fd 21 (socket:[116840])
  Closing set fd 19 (socket:[113527])
  Closing set fd 20 (socket:[116839])
  exec-privatenetwork-yes-privatemounts-yes.service: Changed dead -> start
  Received SIGCHLD from PID 5092 (sh).
  Child 5092 (sh) died (code=exited, status=0/SUCCESS)
  exec-privatenetwork-yes-privatemounts-yes.service: Child 5092 belongs to exec-privatenetwork-yes-privatemounts-yes.service.
  exec-privatenetwork-yes-privatemounts-yes.service: Main process exited, code=exited, status=0/SUCCESS (success)
  exec-privatenetwork-yes-privatemounts-yes.service: Running next main command for state start.
  exec-privatenetwork-yes-privatemounts-yes.service: Will spawn child (service_run_next_main): /bin/sh
  exec-privatenetwork-yes-privatemounts-yes.service: Passing 0 fds to service
  exec-privatenetwork-yes-privatemounts-yes.service: About to execute: /bin/sh -x -c "test ! -e /proc/sys/net/ipv4/conf/dummy-test-exec"
  Serializing sd-executor-state to memfd.
  exec-privatenetwork-yes-privatemounts-yes.service: Forked /bin/sh as 5094
  Closing set fd 21 (socket:[116840])
  Closing set fd 19 (socket:[113527])
  Closing set fd 20 (socket:[116839])
  Received SIGCHLD from PID 5094 (sh).
  Child 5094 (sh) died (code=exited, status=0/SUCCESS)
  exec-privatenetwork-yes-privatemounts-yes.service: Child 5094 belongs to exec-privatenetwork-yes-privatemounts-yes.service.
  exec-privatenetwork-yes-privatemounts-yes.service: Main process exited, code=exited, status=0/SUCCESS (success)
  exec-privatenetwork-yes-privatemounts-yes.service: Running next main command for state start.
  exec-privatenetwork-yes-privatemounts-yes.service: Will spawn child (service_run_next_main): /bin/sh
  exec-privatenetwork-yes-privatemounts-yes.service: Passing 0 fds to service
  exec-privatenetwork-yes-privatemounts-yes.service: About to execute: /bin/sh -x -c "test ! -e /sys/class/net/dummy-test-exec"
  Serializing sd-executor-state to memfd.
  exec-privatenetwork-yes-privatemounts-yes.service: Forked /bin/sh as 5095
  Closing set fd 21 (socket:[116840])
  Closing set fd 19 (socket:[113527])
  Closing set fd 20 (socket:[116839])
  exec-privatenetwork-yes-privatemounts-yes.service: Control group is empty.
  Received SIGCHLD from PID 5095 (sh).
  Child 5095 (sh) died (code=exited, status=1/FAILURE)
  exec-privatenetwork-yes-privatemounts-yes.service: Child 5095 belongs to exec-privatenetwork-yes-privatemounts-yes.service.
  exec-privatenetwork-yes-privatemounts-yes.service: Main process exited, code=exited, status=1/FAILURE
  exec-privatenetwork-yes-privatemounts-yes.service: Failed with result 'exit-code'.
  exec-privatenetwork-yes-privatemounts-yes.service: Service will not restart (restart setting)
  exec-privatenetwork-yes-privatemounts-yes.service: Changed start -> failed
  exec-privatenetwork-yes-privatemounts-yes.service: Unit entered failed state.
  exec-privatenetwork-yes-privatemounts-yes.service: Consumed 27ms CPU time.
  src/test/test-execute.c:1109:test_exec_privatenetwork: exec-privatenetwork-yes-privatemounts-yes.service: can_unshare=yes: exit status 1, expected 0
  (test-execute-root) terminated by signal ABRT.
  Assertion 'r >= 0' failed at src/test/test-execute.c:1330, function prepare_ns(). Aborting.

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