posix_ipc in test_regression_testsuite from ubuntu_qrt_apparmor failed on K-5.19 arm64 (Unable to run test sub-executable)

Issue found on Kinetic 5.19 ARM64 systems,

The ApparmorTestsuites.test_regression_testsuite in ubuntu_qrt_apparmor will fail with posix_ipc test:

running posix_ipc
Fatal Error (posix_mq_rcv): Unable to run test sub-executable

It's a bit hard to find which one is failing, here is the test output of ApparmorTestsuites.test_regression_testsuite:

== BEGIN OF TEST OUPTUT ==
running aa_exec

running access
xfail: ACCESS file rx (r)
xfail: ACCESS file rwx (r)
xfail: ACCESS file r (wx)
xfail: ACCESS file rx (wx)
xfail: ACCESS file rwx (wx)
xfail: ACCESS dir rwx (r)
xfail: ACCESS dir r (wx)
xfail: ACCESS dir rx (wx)
xfail: ACCESS dir rwx (wx)

running at_secure

running introspect

running capabilities
        (ptrace)
        (sethostname)
        (setdomainname)
        (setpriority)
        (setscheduler)
        (reboot)
        (chroot)
        (mlockall)
        (net_raw)

running changeprofile

running onexec

running changehat

running changehat_fork

running changehat_misc

*** A 'Killed' message from bash is expected for the following test
/tmp/testlibxbcgpuwp/source/kinetic/apparmor-3.0.7/tests/regression/apparmor/prologue.inc: line 264: 309514 Killed $testexec "$@" > $outfile 2>&1

*** A 'Killed' message from bash is expected for the following test
/tmp/testlibxbcgpuwp/source/kinetic/apparmor-3.0.7/tests/regression/apparmor/prologue.inc: line 264: 309547 Killed $testexec "$@" > $outfile 2>&1

running chdir

running clone

running coredump
*** A 'Segmentation Fault' message from bash is expected for the following test
/tmp/testlibxbcgpuwp/source/kinetic/apparmor-3.0.7/tests/regression/apparmor/prologue.inc: line 264: 309797 Segmentation fault (core dumped) $testexec "$@" > $outfile 2>&1

*** A 'Segmentation Fault' message from bash is expected for the following test
/tmp/testlibxbcgpuwp/source/kinetic/apparmor-3.0.7/tests/regression/apparmor/prologue.inc: line 264: 309826 Segmentation fault $testexec "$@" > $outfile 2>&1

*** A 'Segmentation Fault' message from bash is expected for the following test
/tmp/testlibxbcgpuwp/source/kinetic/apparmor-3.0.7/tests/regression/apparmor/prologue.inc: line 264: 309861 Segmentation fault $testexec "$@" > $outfile 2>&1

*** A 'Segmentation Fault' message from bash is expected for the following test
/tmp/testlibxbcgpuwp/source/kinetic/apparmor-3.0.7/tests/regression/apparmor/prologue.inc: line 264: 309896 Segmentation fault $testexec "$@" > $outfile 2>&1

*** A 'Segmentation Fault' message from bash is expected for the following test
/tmp/testlibxbcgpuwp/source/kinetic/apparmor-3.0.7/tests/regression/apparmor/prologue.inc: line 264: 309931 Segmentation fault $testexec "$@" > $outfile 2>&1
XFAIL: Error: corefile present when not expected -- COREDUMP (ix confinement)

running deleted

running environ

running exec

running exec_qual

running fchdir

running fd_inheritance

running fork

running i18n

running link

running link_subset

running mkdir

running mmap

running mount
    using mount rules ...

running mult_mount

running named_pipe

running namespaces

running net_raw

running open

running openat

running pipe

running pivot_root
 kernel does not support pivot_root domain transitions - skipping tests ...

running posix_ipc
Fatal Error (posix_mq_rcv): Unable to run test sub-executable

running ptrace
   using ptrace v6 tests ...

running pwrite

running query_label

running regex

running rename

running readdir

running rw

running socketpair

running swap

running sd_flags

running setattr

running symlink

running syscall
 WARNING: syscall sysctl not supported by kernel headers, skipping tests ...

running sysv_ipc
Required feature 'ipc/sysv_mqueue' not available.. Skipping tests ...

running tcp

running unix_fd_server

running unix_socket_pathname
xpass: AF_UNIX pathname socket (dgram); confined server w/ access (rw)
xpass: AF_UNIX pathname socket (dgram); confined client w/ access (rw)

running unix_socket_abstract

running unix_socket_unnamed
xpass: AF_UNIX unnamed socket (dgram); confined server (peer label w/ implicit perms)
xpass: AF_UNIX unnamed socket (dgram); confined server (peer label w/ explicit perms)
xpass: AF_UNIX unnamed socket (dgram); confined server (peer label, peer addr)
xpass: AF_UNIX unnamed socket (dgram); confined server (type, peer label, peer addr)
xpass: AF_UNIX unnamed socket (dgram); confined server (type, addr, peer label)
xpass: AF_UNIX unnamed socket (dgram); confined server (type, addr, peer label, peer addr)

running unix_socket_autobind

running unlink

running xattrs
Required feature 'file/xattr' not available.. Skipping tests ...

running xattrs_profile

running longpath
XFAIL: This version of AppArmor does not support changing buffer size.

running dbus_eavesdrop
dbus[367250]: Unable to set up transient service directory: XDG_RUNTIME_DIR "/run/user/1005" is owned by uid 1005, not our uid 0

running dbus_message
dbus[367532]: Unable to set up transient service directory: XDG_RUNTIME_DIR "/run/user/1005" is owned by uid 1005, not our uid 0

running dbus_service
dbus[368202]: Unable to set up transient service directory: XDG_RUNTIME_DIR "/run/user/1005" is owned by uid 1005, not our uid 0

running dbus_unrequested_reply
dbus[368587]: Unable to set up transient service directory: XDG_RUNTIME_DIR "/run/user/1005" is owned by uid 1005, not our uid 0

running aa_policy_cache

running exec_stack

running nnp

running stackonexec

running stackprofile
make: *** [Makefile:354: tests] Error 1
== END OF TEST OUPTUT ==

The make error in the end might be misleading, making people think "stackprofile" test is failing. But it's actually posix_ipc.sh is failing.

If you run the posix_ipc test manually in apparmor-3.0.7/tests/regression/apparmor, it will try to run another posix_mq.sh script, which will fail with:
  Fatal Error (posix_mq_rcv): Unable to run test sub-executable