test_maps in ubuntu_bpf failed with "Failed to create sockmap"

Series: Bionic
Kernel: linux-kvm 4.15.0-1052.52

1. 12/06 04:43:58 DEBUG| utils:0116| Running './test_maps'
2. 12/06 04:43:59 DEBUG| utils:0153| [stdout] Failed to create sockmap -1
3. 12/06 04:43:59 ERROR| test:0414| Exception escaping from test:
4. Traceback (most recent call last):
5. File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
6. _call_test_function(self.execute, *p_args, **p_dargs)
7. File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
8. return func(*args, **dargs)
9. File "/home/ubuntu/autotest/client/shared/test.py", line 291, in execute
10. postprocess_profiled_run, args, dargs)
11. File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
12. self.run_once(*args, **dargs)
13. File "/home/ubuntu/autotest/client/tests/ubuntu_bpf/ubuntu_bpf.py", line 57, in run_once
14. self.results = utils.system_output(cmd, retain_output=True)
15. File "/home/ubuntu/autotest/client/shared/utils.py", line 1267, in system_output
16. verbose=verbose, args=args).stdout
17. File "/home/ubuntu/autotest/client/shared/utils.py", line 918, in run
18. "Command returned non-zero exit status")
19. CmdError: Command <./test_maps> failed, rc=1, Command returned non-zero exit status
20. * Command:
21. ./test_maps
22. Exit status: 1
23. Duration: 0.821275949478
24.
25. stdout:
26. Failed to create sockmap -1