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Segfault withasyncio.base_events.BaseEventLoop when passed a small float toset_debug. #126881

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kumaraditya303
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3.12only security fixes3.13bugs and security fixes3.14bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)type-crashA hard crash of the interpreter, possibly with a core dump
@devdanzin

Description

@devdanzin

Crash report

What happened?

It's possible to segfault the interpreter by passing a small float as theenabled parameter ofasyncio.base_events.BaseEventLoop.set_debug():

importasyncio.base_eventsobj=asyncio.base_events.BaseEventLoop()obj.set_debug(0.0005)obj._run_forever_setup()

Found using fusil by@vstinner.

CPython versions tested on:

3.13, 3.14, CPython main branch

Operating systems tested on:

Linux

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

Python 3.14.0a1+ experimental free-threading build (heads/main-dirty:54c63a32d0, Nov 8 2024, 20:16:36) [GCC 11.4.0]

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Metadata

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3.12only security fixes3.13bugs and security fixes3.14bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)type-crashA hard crash of the interpreter, possibly with a core dump

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