[New-bugs-announce] [issue44949] test_readline: test_auto_history_disabled() fails on aarch64 RHEL8 Refleaks 3.9, 3.10 and 3.x

[STINNER Victor]

New submission from STINNER Victor <vstinner at python.org>:

test_readline fails randomly on aarc64 RHEL8 buildbots (3.9, 3.10 and 3.x).

In some builds, test_readline fails but then pass when re-run in verbose mode. Example:
https://buildbot.python.org/all/#/builders/41/builds/148
---
0:02:56 load avg: 2.79 Re-running test_readline in verbose mode (matching: test_auto_history_disabled)
test_auto_history_disabled (test.test_readline.TestReadline) ... ok
---


aarch64 RHEL8 Refleaks 3.9:
https://buildbot.python.org/all/#/builders/247/builds/107

test.pythoninfo:

readline._READLINE_LIBRARY_VERSION: 7.0
readline._READLINE_RUNTIME_VERSION: 0x700
readline._READLINE_VERSION: 0x700

Tests:

0:33:57 load avg: 0.93 Re-running test_readline in verbose mode (matching: test_auto_history_disabled)
beginning 6 repetitions
123456
readline version: 0x700
readline runtime version: 0x700
readline library version: '7.0'
use libedit emulation? False
test test_readline failed
test_auto_history_disabled (test.test_readline.TestReadline) ... FAIL
======================================================================
FAIL: test_auto_history_disabled (test.test_readline.TestReadline)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.9.cstratak-RHEL8-aarch64.refleak/build/Lib/test/test_readline.py", line 154, in test_auto_history_disabled
    self.assertIn(b"History length: 0\r\n", output)
AssertionError: b'History length: 0\r\n' not found in bytearray(b'dummy input\r\ndummy input\r\nHistory length: 0')
----------------------------------------------------------------------

----------
components: Tests
messages: 399848
nosy: erlendaasland, lukasz.langa, pablogsal, vstinner
priority: normal
severity: normal
status: open
title: test_readline: test_auto_history_disabled() fails on aarch64 RHEL8 Refleaks 3.9, 3.10 and 3.x
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44949>
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