UnicodeDecodeError raised when running python tests on arm instance

Run command 'python/run-tests --python-executables=python2.7,python3.6' on arm instance, then UnicodeDecodeError raised:

....

Starting test(python2.7): pyspark.broadcast

Got an exception while trying to store skipped test output:
Traceback (most recent call last):
File "./python/run-tests.py", line 137, in run_individual_python_test
decoded_lines = map(lambda line: line.decode(), iter(per_test_output))
File "./python/run-tests.py", line 137, in <lambda>
decoded_lines = map(lambda line: line.decode(), iter(per_test_output))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe4 in position 51: ordinal not in range(128)