[issue21435] Segfault with cyclic reference and asyncio.Future

[STINNER Victor]

STINNER Victor added the comment:

Similar(?) issue #20526:
Modules/gcmodule.c:379: visit_decref: Assertion `((gc)->gc.gc_refs >> (1)) != 0' failed.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21435>
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