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test_ssl fails with "env changed" on ARM64 Windows buildbot: thread doesn't catch TimeoutError #108342

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vstinner opened this issue Aug 23, 2023 · 1 comment
Closed
2 tasks done

test_ssl fails with "env changed" on ARM64 Windows buildbot: thread doesn't catch TimeoutError #108342

vstinner opened this issue Aug 23, 2023 · 1 comment
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topic-SSL type-bug An unexpected behavior, bug, or error

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@vstinner
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vstinner commented Aug 23, 2023 •
edited by bedevere-bot
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Bug report

Checklist

  • I am confident this is a bug in CPython, not a bug in a third-party project
  • I have searched the CPython issue tracker,
    and am confident this bug has not been reported before

CPython versions tested on:

CPython main branch

Operating systems tested on:

Windows

Output from running 'python -VV' on the command line:

No response

A clear and concise description of the bug:

ARM64 Windows Non-Debug PR buildbot build failed with: test_ssl failed (env changed):

== CPython 3.13.0a0 (heads/refs/pull/108299/merge-dirty:5af459ef07, Aug 23 2023, 01:37:38) [MSC v.1936 64 bit (AMD64)]
== Windows-11-10.0.22621-SP0 little-endian
== Python build: debug
== cwd: R:\buildarea\pull_request.ambv-bb-win11.bigmem\build\build\test_python_12132�
== CPU count: 6
== encodings: locale=cp1252, FS=utf-8
0:00:00 Run tests in parallel using 4 child processes (timeout: 1 hour 15 min, worker timeout: 1 hour 20 min)
(...)
0:08:08 load avg: 0.81 [228/447/1] test_ssl failed (env changed) (32.5 sec) -- ...
(...)
test_https_client_non_tls_response_ignored (test.test_ssl.TestPreHandshakeClose.test_https_client_non_tls_response_ignored) ...

Warning -- Uncaught thread exception: TimeoutError
Exception in thread non_tls_http_RST_responder:
Traceback (most recent call last):
  File "R:\buildarea\pull_request.ambv-bb-win11.bigmem\build\Lib\threading.py", line 1059, in _bootstrap_inner
    self.run()
  File "R:\buildarea\pull_request.ambv-bb-win11.bigmem\build\Lib\test\test_ssl.py", line 4708, in run
    conn, address = self.listener.accept()
                    ^^^^^^^^^^^^^^^^^^^^^^
  File "R:\buildarea\pull_request.ambv-bb-win11.bigmem\build\Lib\socket.py", line 295, in accept
    fd, addr = self._accept()
               ^^^^^^^^^^^^^^
TimeoutError: timed out
ok

test.pythoninfo:

ssl.OPENSSL_VERSION: OpenSSL 3.0.9 30 May 2023
ssl.OPENSSL_VERSION_INFO: (3, 0, 0, 9, 0)

Linked PRs
@vstinner vstinner added the type-bug An unexpected behavior, bug, or error label Aug 23, 2023
@vstinner vstinner mentioned this issue Aug 23, 2023
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@vstinner
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Not sure if it's the same, but on Linux, I can reproduce an "env changed" failure:

$ ./python -m test test_ssl -u all --fail-env-changed -v -R 3:3 -m test_preauth_data_to_tls_server
(...)
Warning -- threading_cleanup() failed to cleanup 0 threads (count: 0, dangling: 2)
Warning -- Dangling thread: <SingleConnectionTestServerThread(preauth_data_to_tls_server, stopped 139945293178560)>
Warning -- Dangling thread: <_MainThread(MainThread, started 139945539692352)>
(...)
Tests result: ENV CHANGED

vstinner added a commit to vstinner/cpython that referenced this issue Aug 23, 2023
@vstinner
pythongh-108342: Break ref cycle in SSLSocket._create() exc
7d384a2 
Break explicitly a reference cycle when SSLSocket._create() raises an
exception. Clear the variable storing the exception, since the
exception traceback contains the variables and so creates a reference
cycle.
@bedevere-bot bedevere-bot mentioned this issue Aug 23, 2023
Merged
gpshead pushed a commit that referenced this issue Aug 23, 2023
@vstinner
gh-108342: Break ref cycle in SSLSocket._create() exc (#108344)
64f9935 
Explicitly break a reference cycle when SSLSocket._create() raises an
exception. Clear the variable storing the exception, since the
exception traceback contains the variables and so creates a reference
cycle.

This test leak was introduced by the test added for the fix of #108310.
@bedevere-bot bedevere-bot mentioned this issue Aug 23, 2023
Merged
miss-islington pushed a commit to miss-islington/cpython that referenced this issue Aug 23, 2023
@vstinner @miss-islington
pythongh-108342: Break ref cycle in SSLSocket._create() exc (pythonGH…
20414fa 
…-108344)

Explicitly break a reference cycle when SSLSocket._create() raises an
exception. Clear the variable storing the exception, since the
exception traceback contains the variables and so creates a reference
cycle.

This test leak was introduced by the test added for the fix of pythonGH-108310.
(cherry picked from commit 64f9935)

Co-authored-by: Victor Stinner <[email protected]>
@bedevere-bot bedevere-bot mentioned this issue Aug 23, 2023
Merged
miss-islington pushed a commit to miss-islington/cpython that referenced this issue Aug 23, 2023
@vstinner @miss-islington
pythongh-108342: Break ref cycle in SSLSocket._create() exc (pythonGH…
8e55056 
…-108344)

Explicitly break a reference cycle when SSLSocket._create() raises an
exception. Clear the variable storing the exception, since the
exception traceback contains the variables and so creates a reference
cycle.

This test leak was introduced by the test added for the fix of pythonGH-108310.
(cherry picked from commit 64f9935)

Co-authored-by: Victor Stinner <[email protected]>
This was referenced Aug 23, 2023
Merged
Merged
miss-islington pushed a commit to miss-islington/cpython that referenced this issue Aug 23, 2023
@vstinner @miss-islington
pythongh-108342: Break ref cycle in SSLSocket._create() exc (pythonGH…
8c57e81 
…-108344)

Explicitly break a reference cycle when SSLSocket._create() raises an
exception. Clear the variable storing the exception, since the
exception traceback contains the variables and so creates a reference
cycle.

This test leak was introduced by the test added for the fix of pythonGH-108310.
(cherry picked from commit 64f9935)

Co-authored-by: Victor Stinner <[email protected]>
@bedevere-bot bedevere-bot mentioned this issue Aug 23, 2023
Merged
miss-islington pushed a commit to miss-islington/cpython that referenced this issue Aug 23, 2023
@vstinner @miss-islington
pythongh-108342: Break ref cycle in SSLSocket._create() exc (pythonGH…
6804cae 
…-108344)

Explicitly break a reference cycle when SSLSocket._create() raises an
exception. Clear the variable storing the exception, since the
exception traceback contains the variables and so creates a reference
cycle.

This test leak was introduced by the test added for the fix of pythonGH-108310.
(cherry picked from commit 64f9935)

Co-authored-by: Victor Stinner <[email protected]>
miss-islington pushed a commit to miss-islington/cpython that referenced this issue Aug 23, 2023
@vstinner @miss-islington
pythongh-108342: Break ref cycle in SSLSocket._create() exc (pythonGH…
e64fc4d 
…-108344)

Explicitly break a reference cycle when SSLSocket._create() raises an
exception. Clear the variable storing the exception, since the
exception traceback contains the variables and so creates a reference
cycle.

This test leak was introduced by the test added for the fix of pythonGH-108310.
(cherry picked from commit 64f9935)

Co-authored-by: Victor Stinner <[email protected]>
ambv pushed a commit that referenced this issue Aug 23, 2023
@miss-islington @vstinner
[3.12] gh-108342: Break ref cycle in SSLSocket._create() exc (GH-108344…
61dbf46 
…) (#108348)

Explicitly break a reference cycle when SSLSocket._create() raises an
exception. Clear the variable storing the exception, since the
exception traceback contains the variables and so creates a reference
cycle.

This test leak was introduced by the test added for the fix of GH-108310.
(cherry picked from commit 64f9935)

Co-authored-by: Victor Stinner <[email protected]>
ambv pushed a commit that referenced this issue Aug 23, 2023
@miss-islington @vstinner
[3.11] gh-108342: Break ref cycle in SSLSocket._create() exc (GH-108344…
93714b7 
…) (#108349)

Explicitly break a reference cycle when SSLSocket._create() raises an
exception. Clear the variable storing the exception, since the
exception traceback contains the variables and so creates a reference
cycle.

This test leak was introduced by the test added for the fix of GH-108310.
(cherry picked from commit 64f9935)

Co-authored-by: Victor Stinner <[email protected]>
ambv pushed a commit that referenced this issue Aug 23, 2023
@miss-islington @vstinner
[3.10] gh-108342: Break ref cycle in SSLSocket._create() exc (GH-108344…
893c3b7 
…) (#108350)

Explicitly break a reference cycle when SSLSocket._create() raises an
exception. Clear the variable storing the exception, since the
exception traceback contains the variables and so creates a reference
cycle.

This test leak was introduced by the test added for the fix of GH-108310.
(cherry picked from commit 64f9935)

Co-authored-by: Victor Stinner <[email protected]>
ambv pushed a commit that referenced this issue Aug 23, 2023
@miss-islington @vstinner
[3.9] gh-108342: Break ref cycle in SSLSocket._create() exc (GH-108344)…
b8058b3 
… (#108351)

Explicitly break a reference cycle when SSLSocket._create() raises an
exception. Clear the variable storing the exception, since the
exception traceback contains the variables and so creates a reference
cycle.

This test leak was introduced by the test added for the fix of GH-108310.
(cherry picked from commit 64f9935)

Co-authored-by: Victor Stinner <[email protected]>
ambv pushed a commit that referenced this issue Aug 23, 2023
@miss-islington @vstinner
[3.8] gh-108342: Break ref cycle in SSLSocket._create() exc (GH-108344)…
6f2b64f 
… (#108352)

Explicitly break a reference cycle when SSLSocket._create() raises an
exception. Clear the variable storing the exception, since the
exception traceback contains the variables and so creates a reference
cycle.

This test leak was introduced by the test added for the fix of GH-108310.
(cherry picked from commit 64f9935)

Co-authored-by: Victor Stinner <[email protected]>
vstinner added a commit to vstinner/cpython that referenced this issue Aug 23, 2023
@vstinner
pythongh-108342: Break ref cycle in test_ssl preauth
ff74fd7 
In preauth tests of test_ssl, explicitly break reference cycles
invoving SingleConnectionTestServerThread to make sure that the
thread is deleted. Otherwise, the test marks the environment as
altered because the threading module sees a "dangling thread"
(SingleConnectionTestServerThread).

This test leak was introduced by the test added for the fix of issue
pythongh-108310.
@bedevere-bot bedevere-bot mentioned this issue Aug 23, 2023
Merged
vstinner added a commit to vstinner/cpython that referenced this issue Aug 23, 2023
@vstinner
pythongh-108342: Make ssl TestPreHandshakeClose more reliable
51e1e09 
* In preauth tests of test_ssl, explicitly break reference cycles
  invoving SingleConnectionTestServerThread to make sure that the
  thread is deleted. Otherwise, the test marks the environment as
  altered because the threading module sees a "dangling thread"
  (SingleConnectionTestServerThread). This test leak was introduced
  by the test added for the fix of issue pythongh-108310.
* Use support.SHORT_TIMEOUT instead of hardcoded 1.0 or 2.0 seconds
  timeout.
* SingleConnectionTestServerThread.run() catchs TimeoutError
* Fix a race condition (missing synchronization) in
  test_preauth_data_to_tls_client(): the server now waits until the
  client connect() completed in call_after_accept().
* Replace socket.send() with socket.sendall()
* test_https_client_non_tls_response_ignored() calls server.join()
  explicitly.
* Replace "localhost" with server.listener.getsockname()[0].
vstinner added a commit that referenced this issue Aug 23, 2023
@vstinner
gh-108342: Make ssl TestPreHandshakeClose more reliable (#108370)
592bacb 
* In preauth tests of test_ssl, explicitly break reference cycles
  invoving SingleConnectionTestServerThread to make sure that the
  thread is deleted. Otherwise, the test marks the environment as
  altered because the threading module sees a "dangling thread"
  (SingleConnectionTestServerThread). This test leak was introduced
  by the test added for the fix of issue gh-108310.
* Use support.SHORT_TIMEOUT instead of hardcoded 1.0 or 2.0 seconds
  timeout.
* SingleConnectionTestServerThread.run() catchs TimeoutError
* Fix a race condition (missing synchronization) in
  test_preauth_data_to_tls_client(): the server now waits until the
  client connect() completed in call_after_accept().
* test_https_client_non_tls_response_ignored() calls server.join()
  explicitly.
* Replace "localhost" with server.listener.getsockname()[0].
ambv pushed a commit to ambv/cpython that referenced this issue Aug 24, 2023
@vstinner @ambv
[3.12] pythongh-108342: Make ssl TestPreHandshakeClose more reliable (p…
26ef89c 
…ythonGH-108370)

* In preauth tests of test_ssl, explicitly break reference cycles
  invoving SingleConnectionTestServerThread to make sure that the
  thread is deleted. Otherwise, the test marks the environment as
  altered because the threading module sees a "dangling thread"
  (SingleConnectionTestServerThread). This test leak was introduced
  by the test added for the fix of issue pythongh-108310.
* Use support.SHORT_TIMEOUT instead of hardcoded 1.0 or 2.0 seconds
  timeout.
* SingleConnectionTestServerThread.run() catchs TimeoutError
* Fix a race condition (missing synchronization) in
  test_preauth_data_to_tls_client(): the server now waits until the
  client connect() completed in call_after_accept().
* test_https_client_non_tls_response_ignored() calls server.join()
  explicitly.
* Replace "localhost" with server.listener.getsockname()[0].
(cherry picked from commit 592bacb)

Co-authored-by: Victor Stinner <[email protected]>
@bedevere-bot bedevere-bot mentioned this issue Aug 24, 2023
Merged
ambv pushed a commit to ambv/cpython that referenced this issue Aug 24, 2023
@vstinner @ambv
[3.11] pythongh-108342: Make ssl TestPreHandshakeClose more reliable (p…
6757ff2 
…ythonGH-108370)

* In preauth tests of test_ssl, explicitly break reference cycles
  invoving SingleConnectionTestServerThread to make sure that the
  thread is deleted. Otherwise, the test marks the environment as
  altered because the threading module sees a "dangling thread"
  (SingleConnectionTestServerThread). This test leak was introduced
  by the test added for the fix of issue pythongh-108310.
* Use support.SHORT_TIMEOUT instead of hardcoded 1.0 or 2.0 seconds
  timeout.
* SingleConnectionTestServerThread.run() catchs TimeoutError
* Fix a race condition (missing synchronization) in
  test_preauth_data_to_tls_client(): the server now waits until the
  client connect() completed in call_after_accept().
* test_https_client_non_tls_response_ignored() calls server.join()
  explicitly.
* Replace "localhost" with server.listener.getsockname()[0].
(cherry picked from commit 592bacb)

Co-authored-by: Victor Stinner <[email protected]>
@bedevere-bot bedevere-bot mentioned this issue Aug 24, 2023
Merged
ambv pushed a commit to ambv/cpython that referenced this issue Aug 24, 2023
@vstinner @ambv
[3.10] pythongh-108342: Make ssl TestPreHandshakeClose more reliable (p…
a3169d0 
…ythonGH-108370)

* In preauth tests of test_ssl, explicitly break reference cycles
  invoving SingleConnectionTestServerThread to make sure that the
  thread is deleted. Otherwise, the test marks the environment as
  altered because the threading module sees a "dangling thread"
  (SingleConnectionTestServerThread). This test leak was introduced
  by the test added for the fix of issue pythongh-108310.
* Use support.SHORT_TIMEOUT instead of hardcoded 1.0 or 2.0 seconds
  timeout.
* SingleConnectionTestServerThread.run() catchs TimeoutError
* Fix a race condition (missing synchronization) in
  test_preauth_data_to_tls_client(): the server now waits until the
  client connect() completed in call_after_accept().
* test_https_client_non_tls_response_ignored() calls server.join()
  explicitly.
* Replace "localhost" with server.listener.getsockname()[0].
(cherry picked from commit 592bacb)

Co-authored-by: Victor Stinner <[email protected]>
@bedevere-bot bedevere-bot mentioned this issue Aug 24, 2023
Merged
ambv pushed a commit to ambv/cpython that referenced this issue Aug 24, 2023
@vstinner @ambv
[3.9] pythongh-108342: Make ssl TestPreHandshakeClose more reliable (p…
d2920f8 
…ythonGH-108370)

* In preauth tests of test_ssl, explicitly break reference cycles
  invoving SingleConnectionTestServerThread to make sure that the
  thread is deleted. Otherwise, the test marks the environment as
  altered because the threading module sees a "dangling thread"
  (SingleConnectionTestServerThread). This test leak was introduced
  by the test added for the fix of issue pythongh-108310.
* Use support.SHORT_TIMEOUT instead of hardcoded 1.0 or 2.0 seconds
  timeout.
* SingleConnectionTestServerThread.run() catchs TimeoutError
* Fix a race condition (missing synchronization) in
  test_preauth_data_to_tls_client(): the server now waits until the
  client connect() completed in call_after_accept().
* test_https_client_non_tls_response_ignored() calls server.join()
  explicitly.
* Replace "localhost" with server.listener.getsockname()[0].
(cherry picked from commit 592bacb)

Co-authored-by: Victor Stinner <[email protected]>
@bedevere-bot bedevere-bot mentioned this issue Aug 24, 2023
Merged
ambv pushed a commit to ambv/cpython that referenced this issue Aug 24, 2023
@vstinner @ambv
[3.8] pythongh-108342: Make ssl TestPreHandshakeClose more reliable (p…
bfb2af9 
…ythonGH-108370)

* In preauth tests of test_ssl, explicitly break reference cycles
  invoving SingleConnectionTestServerThread to make sure that the
  thread is deleted. Otherwise, the test marks the environment as
  altered because the threading module sees a "dangling thread"
  (SingleConnectionTestServerThread). This test leak was introduced
  by the test added for the fix of issue pythongh-108310.
* Use support.SHORT_TIMEOUT instead of hardcoded 1.0 or 2.0 seconds
  timeout.
* SingleConnectionTestServerThread.run() catchs TimeoutError
* Fix a race condition (missing synchronization) in
  test_preauth_data_to_tls_client(): the server now waits until the
  client connect() completed in call_after_accept().
* test_https_client_non_tls_response_ignored() calls server.join()
  explicitly.
* Replace "localhost" with server.listener.getsockname()[0].
(cherry picked from commit 592bacb)

Co-authored-by: Victor Stinner <[email protected]>
@bedevere-bot bedevere-bot mentioned this issue Aug 24, 2023
Merged
ambv added a commit that referenced this issue Aug 24, 2023
@ambv @vstinner
[3.12] gh-108342: Make ssl TestPreHandshakeClose more reliable (GH-10…
459f24a 
…8370) (#108404)

* In preauth tests of test_ssl, explicitly break reference cycles
  invoving SingleConnectionTestServerThread to make sure that the
  thread is deleted. Otherwise, the test marks the environment as
  altered because the threading module sees a "dangling thread"
  (SingleConnectionTestServerThread). This test leak was introduced
  by the test added for the fix of issue gh-108310.
* Use support.SHORT_TIMEOUT instead of hardcoded 1.0 or 2.0 seconds
  timeout.
* SingleConnectionTestServerThread.run() catchs TimeoutError
* Fix a race condition (missing synchronization) in
  test_preauth_data_to_tls_client(): the server now waits until the
  client connect() completed in call_after_accept().
* test_https_client_non_tls_response_ignored() calls server.join()
  explicitly.
* Replace "localhost" with server.listener.getsockname()[0].
(cherry picked from commit 592bacb)

Co-authored-by: Victor Stinner <[email protected]>
ambv added a commit that referenced this issue Aug 24, 2023
@ambv @vstinner
[3.11] gh-108342: Make ssl TestPreHandshakeClose more reliable (GH-10…
d90f2f3 
…8370) (#108405)

* In preauth tests of test_ssl, explicitly break reference cycles
  invoving SingleConnectionTestServerThread to make sure that the
  thread is deleted. Otherwise, the test marks the environment as
  altered because the threading module sees a "dangling thread"
  (SingleConnectionTestServerThread). This test leak was introduced
  by the test added for the fix of issue gh-108310.
* Use support.SHORT_TIMEOUT instead of hardcoded 1.0 or 2.0 seconds
  timeout.
* SingleConnectionTestServerThread.run() catchs TimeoutError
* Fix a race condition (missing synchronization) in
  test_preauth_data_to_tls_client(): the server now waits until the
  client connect() completed in call_after_accept().
* test_https_client_non_tls_response_ignored() calls server.join()
  explicitly.
* Replace "localhost" with server.listener.getsockname()[0].
(cherry picked from commit 592bacb)

Co-authored-by: Victor Stinner <[email protected]>
ambv added a commit that referenced this issue Aug 24, 2023
@ambv @vstinner
[3.10] gh-108342: Make ssl TestPreHandshakeClose more reliable (GH-10…
e96bddf 
…8370) (#108406)

* In preauth tests of test_ssl, explicitly break reference cycles
  invoving SingleConnectionTestServerThread to make sure that the
  thread is deleted. Otherwise, the test marks the environment as
  altered because the threading module sees a "dangling thread"
  (SingleConnectionTestServerThread). This test leak was introduced
  by the test added for the fix of issue gh-108310.
* Use support.SHORT_TIMEOUT instead of hardcoded 1.0 or 2.0 seconds
  timeout.
* SingleConnectionTestServerThread.run() catchs TimeoutError
* Fix a race condition (missing synchronization) in
  test_preauth_data_to_tls_client(): the server now waits until the
  client connect() completed in call_after_accept().
* test_https_client_non_tls_response_ignored() calls server.join()
  explicitly.
* Replace "localhost" with server.listener.getsockname()[0].
(cherry picked from commit 592bacb)

Co-authored-by: Victor Stinner <[email protected]>
ambv added a commit that referenced this issue Aug 24, 2023
@ambv @vstinner
[3.9] gh-108342: Make ssl TestPreHandshakeClose more reliable (GH-108370
d2cd0a3 
) (#108407)

* In preauth tests of test_ssl, explicitly break reference cycles
  invoving SingleConnectionTestServerThread to make sure that the
  thread is deleted. Otherwise, the test marks the environment as
  altered because the threading module sees a "dangling thread"
  (SingleConnectionTestServerThread). This test leak was introduced
  by the test added for the fix of issue gh-108310.
* Use support.SHORT_TIMEOUT instead of hardcoded 1.0 or 2.0 seconds
  timeout.
* SingleConnectionTestServerThread.run() catchs TimeoutError
* Fix a race condition (missing synchronization) in
  test_preauth_data_to_tls_client(): the server now waits until the
  client connect() completed in call_after_accept().
* test_https_client_non_tls_response_ignored() calls server.join()
  explicitly.
* Replace "localhost" with server.listener.getsockname()[0].
(cherry picked from commit 592bacb)

Co-authored-by: Victor Stinner <[email protected]>
ambv added a commit that referenced this issue Aug 24, 2023
@ambv
[3.8] gh-108342: Make ssl TestPreHandshakeClose more reliable (GH-108370
efb46e5 
) (#108408)

* In preauth tests of test_ssl, explicitly break reference cycles
  invoving SingleConnectionTestServerThread to make sure that the
  thread is deleted. Otherwise, the test marks the environment as
  altered because the threading module sees a "dangling thread"
  (SingleConnectionTestServerThread). This test leak was introduced
  by the test added for the fix of issue gh-108310.
* Use support.SHORT_TIMEOUT instead of hardcoded 1.0 or 2.0 seconds
  timeout.
* SingleConnectionTestServerThread.run() catchs TimeoutError
* Fix a race condition (missing synchronization) in
  test_preauth_data_to_tls_client(): the server now waits until the
  client connect() completed in call_after_accept().
* test_https_client_non_tls_response_ignored() calls server.join()
  explicitly.
* Replace "localhost" with server.listener.getsockname()[0].
(cherry picked from commit 592bacb)
carlosroman pushed a commit to DataDog/cpython that referenced this issue Oct 11, 2023
@miss-islington @vstinner @carlosroman
[3.9] pythongh-108342: Break ref cycle in SSLSocket._create() exc (py…
cc9c298 
…thonGH-108344) (python#108351)

Explicitly break a reference cycle when SSLSocket._create() raises an
exception. Clear the variable storing the exception, since the
exception traceback contains the variables and so creates a reference
cycle.

This test leak was introduced by the test added for the fix of pythonGH-108310.
(cherry picked from commit 64f9935)

Co-authored-by: Victor Stinner <[email protected]>
carlosroman pushed a commit to DataDog/cpython that referenced this issue Oct 11, 2023
@ambv @vstinner @carlosroman
[3.9] pythongh-108342: Make ssl TestPreHandshakeClose more reliable (p…
e1380b6 
…ythonGH-108370) (python#108407)

* In preauth tests of test_ssl, explicitly break reference cycles
  invoving SingleConnectionTestServerThread to make sure that the
  thread is deleted. Otherwise, the test marks the environment as
  altered because the threading module sees a "dangling thread"
  (SingleConnectionTestServerThread). This test leak was introduced
  by the test added for the fix of issue pythongh-108310.
* Use support.SHORT_TIMEOUT instead of hardcoded 1.0 or 2.0 seconds
  timeout.
* SingleConnectionTestServerThread.run() catchs TimeoutError
* Fix a race condition (missing synchronization) in
  test_preauth_data_to_tls_client(): the server now waits until the
  client connect() completed in call_after_accept().
* test_https_client_non_tls_response_ignored() calls server.join()
  explicitly.
* Replace "localhost" with server.listener.getsockname()[0].
(cherry picked from commit 592bacb)

Co-authored-by: Victor Stinner <[email protected]>
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