[issue35977] test_slice crashed on s390x Debian 3.x: gc_decref: Assertion "gc_get_refs(g) > 0" failed: refcount is too small

[STINNER Victor]

New submission from STINNER Victor <vstinner at redhat.com>:

s390x Debian 3.x:
https://buildbot.python.org/all/#/builders/13/builds/2344

0:06:26 load avg: 0.92 [291/420/1] test_slice crashed (Exit code -6)
Modules/gcmodule.c:110: gc_decref: Assertion "gc_get_refs(g) > 0" failed: refcount is too small
Enable tracemalloc to get the memory block allocation traceback

object  : <test.test_slice.SliceTest.test_cmp.<locals>.BadCmp object at 0x3ff93967e90>
type    : BadCmp
refcount: 1
address : 0x3ff93967e90
Fatal Python error: _PyObject_AssertFailed

Current thread 0x000003ff95272700 (most recent call first):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-debian-z/build/Lib/test/test_slice.py", line 107 in <lambda>
  File "/home/dje/cpython-buildarea/3.x.edelsohn-debian-z/build/Lib/unittest/case.py", line 197 in handle
  File "/home/dje/cpython-buildarea/3.x.edelsohn-debian-z/build/Lib/unittest/case.py", line 782 in assertRaises
  File "/home/dje/cpython-buildarea/3.x.edelsohn-debian-z/build/Lib/test/test_slice.py", line 107 in test_cmp
  File "/home/dje/cpython-buildarea/3.x.edelsohn-debian-z/build/Lib/unittest/case.py", line 642 in run
  File "/home/dje/cpython-buildarea/3.x.edelsohn-debian-z/build/Lib/unittest/case.py", line 702 in __call__
  ...

----------
components: Interpreter Core
messages: 335320
nosy: pablogsal, vstinner
priority: normal
severity: normal
status: open
title: test_slice crashed on s390x Debian 3.x: gc_decref: Assertion "gc_get_refs(g) > 0" failed: refcount is too small
versions: Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35977>
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