Connection to IMAP server cyrus.andrew.cmu.edu hangs

[tiran]

BPO	40964
Nosy	@vstinner, @tiran, @ned-deily, @ambv
PRs	bpo-40964: disable remote IMAP tests #20836

^{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 = 'https://github.com/tiran'
closed_at = None
created_at = <Date 2020-06-12.18:43:06.859>
labels = ['type-bug', '3.8', '3.9', '3.10', '3.7', 'tests']
title = 'Connection to IMAP server cyrus.andrew.cmu.edu hangs'
updated_at = <Date 2020-09-11.10:31:13.514>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2020-09-11.10:31:13.514>
actor = 'vstinner'
assignee = 'christian.heimes'
closed = False
closed_date = None
closer = None
components = ['Tests']
creation = <Date 2020-06-12.18:43:06.859>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 40964
keywords = ['patch']
message_count = 7.0
messages = ['371403', '371406', '371407', '371410', '371411', '371412', '376714']
nosy_count = 4.0
nosy_names = ['vstinner', 'christian.heimes', 'ned.deily', 'lukasz.langa']
pr_nums = ['20836']
priority = None
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue40964'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']

Linked PRs

• gh-85136: Remove disabled remote IMAP tests #106022

[tiran]

All buildbots and tests are currently failing because connections cyrus.andrew.cmu.edu:143 (IMAP) and cyrus.andrew.cmu.edu:993 (IMAPS) are hanging.

[ned-deily]

New changeset 08b1bba by Christian Heimes in branch 'master':
bpo-40964: disable remote IMAP tests (GH-20836)
08b1bba

[tiran]

The remote server is having intermittent issues. Sometimes all three servers behind the host are gone, sometimes they block all packages.

# nmap -vv cyrus.andrew.cmu.edu
Starting Nmap 7.80 ( https://nmap.org ) at 2020-06-12 20:52 CEST
Warning: Hostname cyrus.andrew.cmu.edu resolves to 3 IPs. Using 128.2.157.16.
Initiating Ping Scan at 20:52
Scanning cyrus.andrew.cmu.edu (128.2.157.16) [4 ports]
Completed Ping Scan at 20:52, 0.13s elapsed (1 total hosts)
Initiating Parallel DNS resolution of 1 host. at 20:52
Completed Parallel DNS resolution of 1 host. at 20:52, 0.12s elapsed
Initiating SYN Stealth Scan at 20:52
Scanning cyrus.andrew.cmu.edu (128.2.157.16) [1000 ports]
Completed SYN Stealth Scan at 20:52, 2.88s elapsed (1000 total ports)
Nmap scan report for cyrus.andrew.cmu.edu (128.2.157.16)
Host is up, received reset ttl 239 (0.11s latency).
Other addresses for cyrus.andrew.cmu.edu (not scanned): 128.2.157.15 128.2.157.14
rDNS record for 128.2.157.16: CYRUS.ANDREW.CMU.EDU
Scanned at 2020-06-12 20:52:35 CEST for 3s
Not shown: 979 closed ports
Reason: 979 resets
PORT STATE SERVICE REASON
23/tcp filtered telnet no-response
110/tcp filtered pop3 no-response
135/tcp filtered msrpc no-response
139/tcp filtered netbios-ssn no-response
143/tcp filtered imap no-response
445/tcp filtered microsoft-ds no-response
515/tcp filtered printer no-response
631/tcp filtered ipp no-response
993/tcp filtered imaps no-response
995/tcp filtered pop3s no-response
1433/tcp filtered ms-sql-s no-response
2000/tcp filtered cisco-sccp no-response
2003/tcp filtered finger no-response
2967/tcp filtered symantec-av no-response
3389/tcp filtered ms-wbt-server no-response
5555/tcp filtered freeciv no-response
5900/tcp filtered vnc no-response
5901/tcp filtered vnc-1 no-response
5902/tcp filtered vnc-2 no-response
5903/tcp filtered vnc-3 no-response
9100/tcp filtered jetdirect no-response

Read data files from: /usr/bin/../share/nmap
Nmap done: 1 IP address (1 host up) scanned in 3.42 seconds
Raw packets sent: 1025 (45.076KB) | Rcvd: 980 (39.200KB)

# nmap -vv 128.2.157.16 128.2.157.14 128.2.157.15
Starting Nmap 7.80 ( https://nmap.org ) at 2020-06-12 20:54 CEST
Initiating Ping Scan at 20:54
Scanning 3 hosts [4 ports/host]
Completed Ping Scan at 20:55, 5.03s elapsed (3 total hosts)
Nmap scan report for 128.2.157.16 [host down, received no-response]
Nmap scan report for 128.2.157.14 [host down, received no-response]
Nmap scan report for 128.2.157.15 [host down, received no-response]
Read data files from: /usr/bin/../share/nmap
Nmap done: 3 IP addresses (0 hosts up) scanned in 5.10 seconds
Raw packets sent: 24 (912B) | Rcvd: 0 (0B)

[ned-deily]

New changeset f919179 by Ned Deily (Christian Heimes) in branch '3.9':
bpo-40964: disable remote IMAP tests (GH-20836)
f919179

[ned-deily]

New changeset adce133 by Ned Deily (Christian Heimes) in branch '3.8':
bpo-40964: disable remote IMAP tests (GH-20836)
adce133

[ned-deily]

New changeset 0abb70e by Ned Deily (Christian Heimes) in branch '3.7':
bpo-40964: disable remote IMAP tests (GH-20836)
0abb70e

[vstinner]

The tests have been disabled, so I understand that the "release blocker" priority is no longer needed. It would be nice to reenable these tests, but I consider that it should not block the next 3.9 release.

[erlend-aasland]

These tests have been skipped since 2020. I see three possible ways to resolve this issue:

1. remove the tests (they're not running anyway)
2. remove the guards and cross our fingers
3. amend the tests to automatically skip if the remote server is unavailable

[vstinner]

remove the tests (they're not running anyway)

That sounds like a good idea to me.

[erlend-aasland]

remove the tests (they're not running anyway)

That sounds like a good idea to me.

Resolved with:

• gh-85136: Remove disabled remote IMAP tests #106022

The remote IMAP tests are now removed in main.