aio_dio_bugs.aio-dio-extend-stat can fail to open test file on linux-aws 5.13 ARM64

[Andrea Righi]

aio_dio_bugs can fail with the following error on linux-aws (5.13 - even if this error is present since 5.8) ARM64 instances:
  * a1.medium
  * a1.metal
  * c6g.8xlarge

With:
        11:10:09 DEBUG| Persistent state client._record_indent now set to 2
        11:10:09 DEBUG| Persistent state client.unexpected_reboot now set to ('aio_dio_bugs.aio-dio-extend-stat', 'aio_dio_bugs.aio-dio-extend-stat')
        11:10:09 DEBUG| Waiting for pid 8727 for 600 seconds
        11:10:09 WARNI| System python is too old, crash handling disabled
        11:10:09 DEBUG| Running 'LD_LIBRARY_PATH=/home/ubuntu/autotest/client/deps/libaio/lib/ /home/ubuntu/autotest/client/tmp/aio_dio_bugs/src/aio-dio-extend-stat file'
        11:10:09 DEBUG| [stdout] failed to open test file file, errno: 20
        11:10:09 ERROR| 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/aio_dio_bugs/aio_dio_bugs.py", line 47, in run_once
            utils.system(var_ld_path + ' ' + cmd)
          File "/home/ubuntu/autotest/client/shared/utils.py", line 1232, in system
            verbose=verbose).exit_status
          File "/home/ubuntu/autotest/client/shared/utils.py", line 918, in run
            "Command returned non-zero exit status")
        CmdError: Command failed, rc=1, Command returned non-zero exit status
        * Command:
            LD_LIBRARY_PATH=/home/ubuntu/autotest/client/deps/libaio/lib/
            /home/ubuntu/autotest/client/tmp/aio_dio_bugs/src/aio-dio-extend-stat file
        Exit status: 1
        Duration: 0.0117130279541

It might be a race in the test, more than a kernel bug, but it's worth investigating.

[Po-Hsu Lin (cypressyew)]

Note that this issue seems limited to ARM64. I have the bug title / description updated accordingly.

[Po-Hsu Lin (cypressyew)]

This issue can be found on H-AWS-5.11.0-1020.21 ARM64 as well.