test-apparmor.py from ubuntu_qrt_apparmor fails on Impish on gcp

test-apparmor.py from ubuntu_qrt_apparmor fails on Impish. Only seeing when ran on GCP. Also seen in a previous released version on impish, so not considered a regression.

Host: f1-micro

10/21 01:12:18 DEBUG| utils:0156| [stdout] preparing apparmor_3.0.3-0ubuntu1.dsc...
10/21 01:12:19 ERROR| utils:0157| [stderr] Run kernel regression tests ...
10/21 01:12:20 ERROR| test:0414| Exception escaping from test:
Traceback (most recent call last):
  File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
    return func(*args, **dargs)
  File "/home/ubuntu/autotest/client/shared/test.py", line 291, in execute
    postprocess_profiled_run, args, dargs)
  File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
    self.run_once(*args, **dargs)
  File "/home/ubuntu/autotest/client/tests/ubuntu_qrt_apparmor/ubuntu_qrt_apparmor.py", line 111, in run_once
    self.results = utils.system_output(cmd, retain_output=True)
  File "/home/ubuntu/autotest/client/shared/utils.py", line 1267, in system_output
    verbose=verbose, args=args).stdout
  File "/home/ubuntu/autotest/client/shared/utils.py", line 918, in run
    "Command returned non-zero exit status")
CmdError: Command <python3 ./test-apparmor.py -v> failed, rc=-9, Command returned non-zero exit status
* Command:
    python3 ./test-apparmor.py -v
Exit status: -9
Duration: 3401.14232302

stdout:
Running test: './test-apparmor.py' distro: 'Ubuntu 21.10' kernel: '5.13.0-21.21 (Ubuntu 5.13.0-21.21-generic 5.13.18)' arch: 'amd64' uid: 0/0 SUDO_USER: 'ubuntu')
Skipping private tests

WARN: kernel rate limiting in effect
Disabling ratelimiting until the next reboot. To renable, run:
# sysctl -w kernel.printk_ratelimit=5