test_ftplib: test_storlines() fails randomly #109845
Description
s390x RHEL7 Refleaks 3.x:
0:00:19 load avg: 3.25 [ 17/463/1] test_ftplib failed (1 failure)
beginning 6 repetitions
123456
..test test_ftplib failed -- Traceback (most recent call last):
File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel-z.refleak/build/Lib/test/test_ftplib.py", line 634, in test_storlines
self.check_data(self.server.handler_instance.last_received_data, RETR_DATA)
File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel-z.refleak/build/Lib/test/test_ftplib.py", line 505, in check_data
self.assertEqual(len(received), len(expected))
AssertionError: 12019 != 12018
build: https://buildbot.python.org/all/#/builders/129/builds/890
I can reproduce the failure locally on Linux with command:
vstinner@mona$ ./python -m test test_ftplib -m test_storlines -u all -j10 --forever -R 3:3
(...)
0:00:10 load avg: 24.24 [ 11/1] test_ftplib failed (1 failure)
beginning 6 repetitions
123456
..test test_ftplib failed -- Traceback (most recent call last):
File "/home/vstinner/python/main/Lib/test/test_ftplib.py", line 634, in test_storlines
self.check_data(self.server.handler_instance.last_received_data, RETR_DATA)
File "/home/vstinner/python/main/Lib/test/test_ftplib.py", line 505, in check_data
self.assertEqual(len(received), len(expected))
AssertionError: 12019 != 12018