userns from test_regression_testsuite in ubuntu_qrt_apparmor failed on Noble

[Po-Hsu Lin]

Issue found on Azure Standard_B1ms, GCP g1-small with Noble:
  * 6.8.0-34.34
  * 6.8.0-35.35
  * N-azure 6.8.0-1008.8
  * N-gcp 6.8.0-1008.9

(it's not failing every time)

Other than the posix_ipc (could not mq_notify: Connection timed out) test failure bug 2051352. This userns test can be found failing on this instance as well.

Test failed with:
 running userns
 Error: userns failed. Test 'USERNS (confined specific perms apparmor_restrict_unprivileged_userns disabled) setns - root' was expected to 'pass'. Reason for failure 'FAIL - open write pipe /tmp/pipe1 - No such device or address'
 Error: userns failed. Test 'USERNS (confined specific perms apparmor_restrict_unprivileged_userns disabled) setns - root' was expected to 'pass'. Reason for failure 'FAIL - open write pipe /tmp/pipe1 - No such device or address'
 Error: userns failed. Test 'USERNS (confined specific perms apparmor_restrict_unprivileged_userns disabled) setns - user' was expected to 'pass'. Reason for failure 'FAIL - open write pipe /tmp/pipe1 - No such device or address'
 Error: userns failed. Test 'USERNS (unconfined apparmor_restrict_unprivileged_userns enabled) setns - user' was expected to 'pass'. Reason for failure 'FAIL - open write pipe /tmp/pipe1 - No such device or address'

PASSED: aa_exec access attach_disconnected at_secure introspect capabilities changeprofile onexec changehat changehat_fork changehat_misc chdir clone coredump deleted e2e environ exec exec_qual fchdir fd_inheritance fork i18n link link_subset mkdir mmap mount mult_mount named_pipe namespaces net_raw open openat pipe pivot_root ptrace pwrite query_label regex rename readdir rw socketpair swap sd_flags setattr symlink syscall sysv_ipc tcp unix_fd_server unix_socket_pathname unix_socket_abstract unix_socket_unnamed unix_socket_autobind unlink xattrs xattrs_profile longpath nfs dbus_eavesdrop dbus_message dbus_service dbus_unrequested_reply io_uring aa_policy_cache exec_stack nnp stackonexec stackprofile
FAILED: posix_ipc userns