test_largefile: TestSocketSendfile.test_it() failed on AMD64 Fedora Stable Refleaks 3.x

[vstinner]

BPO	39004
Nosy	@vstinner, @giampaolo, @pablogsal
PRs	bpo-39004: increment large sendfile() test timeout #17552

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-12-10.12:29:56.485>
created_at = <Date 2019-12-09.13:24:37.405>
labels = ['tests', '3.9']
title = 'test_largefile: TestSocketSendfile.test_it() failed on AMD64 Fedora Stable Refleaks 3.x'
updated_at = <Date 2019-12-10.12:29:56.480>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2019-12-10.12:29:56.480>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2019-12-10.12:29:56.485>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2019-12-09.13:24:37.405>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 39004
keywords = ['patch']
message_count = 5.0
messages = ['358075', '358076', '358172', '358174', '358184']
nosy_count = 3.0
nosy_names = ['vstinner', 'giampaolo.rodola', 'pablogsal']
pr_nums = ['17552']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue39004'
versions = ['Python 3.9']

[vstinner]

0:22:15 load avg: 15.82 [288/420/3] test_largefile failed (11 min 19 sec) -- running: test_capi (2 min 40 sec), test_compileall (3 min 42 sec), test_shelve (14 min 46 sec), test_sax (10 min 4 sec), test_dbm (3 min 36 sec), test_multiprocessing_spawn (13 min 21 sec), test_posix (3 min 39 sec), test_mailbox (12 min 46 sec), test_asyncio (9 min 23 sec)
beginning 6 repetitions
123456
.Warning -- threading._dangling was modified by test_largefile
  Before: {<weakref at 0x7f1cf0e08fb0; to '_MainThread' at 0x7f1cf19395a0>}
  After:  {<weakref at 0x7f1cf0526470; to '_MainThread' at 0x7f1cf19395a0>, <weakref at 0x7f1cf0526170; to 'Thread' at 0x7f1cf057a3c0>} 
test test_largefile failed -- Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-x86_64.refleak/build/Lib/test/test_largefile.py", line 211, in test_it
    self.assertEqual(os.path.getsize(TESTFN2), size)
AssertionError: 2496925696 != 2500000001

[vstinner]

AMD64 Fedora Stable Refleaks 3.x:
https://buildbot.python.org/all/#/builders/126/builds/14

[giampaolo]

I suspect it's a timing problem (client disconnects, threaded server fails to detect that in time). Let's see what happens by incrementing the timeout when waiting for the thread to be join()ed (PR-17552).

[giampaolo]

New changeset 8237497 by Giampaolo Rodola in branch 'master':
bpo-39004: increment large sendfile() test timeout (GH-17552)
8237497

[vstinner]

Let's say that it's enough to hide the race condition :-) I close the issue.