kselftest: powerpc/ptrace:ptrace-hwbreak fails on ppc64el.10

Seen on kernel-P10d-LPAR10

Lgs:
12865 05:57:00 INFO | START ubuntu_kernel_selftests.powerpc/ptrace:ptrace-hwbreak ubuntu_kernel_selftests.powerpc/ptrace:ptrace-hwbreak timeout=1800 timestamp=1690351020 localtime=Jul 26 05:57:00
      12866 05:57:00 DEBUG| Persistent state client._record_indent now set to 2
      12867 05:57:00 DEBUG| Persistent state client.unexpected_reboot now set to ('ubuntu_kernel_selftests.powerpc/ptrace:ptrace-hwbreak', 'ubuntu_kernel_selftests.powerpc/ptrace:ptrace-hwbreak')
      12868 05:57:00 DEBUG| Waiting for pid 1557555 for 1800 seconds
      12869 05:57:00 WARNI| System python is too old, crash handling disabled
      12870 05:57:00 DEBUG| Running 'make run_tests -C powerpc/ptrace TEST_PROGS=ptrace-hwbreak TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
      12871 05:57:00 DEBUG| [stdout] make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/ptrace'
      12872 05:57:00 DEBUG| [stdout] TAP version 13
      12873 05:57:00 DEBUG| [stdout] 1..1
      12874 05:57:00 DEBUG| [stdout] # selftests: powerpc/ptrace: ptrace-hwbreak
      12875 05:57:00 DEBUG| [stdout] # test: ptrace-hwbreak
      12876 05:57:00 DEBUG| [stdout] # tags: git_version:unknown
      12877 05:57:00 DEBUG| [stdout] # PTRACE_SET_DEBUGREG, WO, len: 1: Ok
      12878 05:57:00 DEBUG| [stdout] # PTRACE_SET_DEBUGREG, WO, len: 2: Ok
      12879 05:57:00 DEBUG| [stdout] # PTRACE_SET_DEBUGREG, WO, len: 4: Ok
      12880 05:57:00 DEBUG| [stdout] # PTRACE_SET_DEBUGREG, WO, len: 8: Ok
      12881 05:57:00 DEBUG| [stdout] # PTRACE_SET_DEBUGREG, RO, len: 1: Fail
      12882 05:57:00 DEBUG| [stdout] # failure: ptrace-hwbreak
      12883 05:57:00 DEBUG| [stdout] not ok 1 selftests: powerpc/ptrace: ptrace-hwbreak # exit=255
      12884 05:57:00 DEBUG| [stdout] make: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/ptrace'
      12885 05:57:00 ERROR| Exception escaping from test:
      12886 Traceback (most recent call last):
      12887 File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
      12888 _call_test_function(self.execute, *p_args, **p_dargs)
      12889 File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
      12890 return func(*args, **dargs)
      12891 ^^^^^^^^^^^^^^^^^^^^
      12892 File "/home/ubuntu/autotest/client/shared/test.py", line 290, in execute
      12893 self._call_run_once(constraints, profile_only,
      12894 File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
      12895 self.run_once(*args, **dargs)
      12896 File "/home/ubuntu/autotest/client/tests/ubuntu_kernel_selftests/ubuntu_kernel_selftests.py", line 282, in run_once
      12897 raise error.TestError(test_name + ' failed.')
      12898 autotest.client.shared.error.TestError: powerpc/ptrace:ptrace-hwbreak failed.
      12899 05:57:00 ERROR| child process failed
      12900 05:57:00 DEBUG| Traceback (most recent call last):
      12901 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
      12902 05:57:00 DEBUG| _call_test_function(self.execute, *p_args, **p_dargs)
      12903 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
      12904 05:57:00 DEBUG| return func(*args, **dargs)
      12905 05:57:00 DEBUG| ^^^^^^^^^^^^^^^^^^^^
      12906 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 290, in execute
      12907 05:57:00 DEBUG| self._call_run_once(constraints, profile_only,
      12908 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
      12909 05:57:00 DEBUG| self.run_once(*args, **dargs)
      12910 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/tests/ubuntu_kernel_selftests/ubuntu_kernel_selftests.py", line 282, in run_once
      12911 05:57:00 DEBUG| raise error.TestError(test_name + ' failed.')
      12912 05:57:00 DEBUG| autotest.client.shared.error.TestError: powerpc/ptrace:ptrace-hwbreak failed.
      12913 05:57:00 DEBUG|
      12914 05:57:00 DEBUG| During handling of the above exception, another exception occurred:
      12915 05:57:00 DEBUG|
      12916 05:57:00 DEBUG| Traceback (most recent call last):
      12917 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/parallel.py", line 25, in fork_start
      12918 05:57:00 DEBUG| l()
      12919 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/job.py", line 505, in
      12920 05:57:00 DEBUG| l = lambda: test.runtest(self, url, tag, args, dargs)
      12921 05:57:00 DEBUG| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      12922 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/test.py", line 121, in runtest
      12923 05:57:00 DEBUG| common_test.runtest(job, url, tag, args, dargs, locals(), globals(),
      12924 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 913, in runtest
      12925 05:57:00 DEBUG| mytest._exec(args, dargs)
      12926 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 434, in _exec
      12927 05:57:00 DEBUG| raise exc_info[0](exc_info[1]).with_traceback(exc_info[2])
      12928 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
      12929 05:57:00 DEBUG| _call_test_function(self.execute, *p_args, **p_dargs)
      12930 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
      12931 05:57:00 DEBUG| return func(*args, **dargs)
      12932 05:57:00 DEBUG| ^^^^^^^^^^^^^^^^^^^^
      12933 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 290, in execute
      12934 05:57:00 DEBUG| self._call_run_once(constraints, profile_only,
      12935 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
      12936 05:57:00 DEBUG| self.run_once(*args, **dargs)
      12937 05:57:00 DEBUG| File "/home/ubuntu/autotest/client/tests/ubuntu_kernel_selftests/ubuntu_kernel_selftests.py", line 282, in run_once
      12938 05:57:00 DEBUG| raise error.TestError(test_name + ' failed.')
      12939 05:57:00 DEBUG| autotest.client.shared.error.TestError: powerpc/ptrace:ptrace-hwbreak failed.
      12940 05:57:02 INFO | ERROR ubuntu_kernel_selftests.powerpc/ptrace:ptrace-hwbreak ubuntu_kernel_selftests.powerpc/ptrace:ptrace-hwbreak timestamp=1690351022 localtime=Jul 26 05:57:02 pow

Considered not a regression because this is the first cycle where we run power 10