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SIGSEV in datetime.timedelta (possibly from datetime's C delta_new) #132413

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@Jacoblightning

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@Jacoblightning

Crash report

What happened?

I was testing some AI code with ollama and stumbled across a really weird crash.
The fact that it happens during an IndexError and a specific function has to be there leads me to believe that this is a CPython bug and not an ollama bug.

from ollama import chat

# Has to be here to segfault???
def colorSwitch(color): 
    print(color, end="", flush=True)


stream = chat(
    model="llama3.2", # I think it works with any but this is what I used.
    messages=[{"role": "user", "content": ""}],
    options={"seed":0}, # Does not need this but I figured it would be helpful
    stream=True,
)
# Any iteration works. I just simplified it down to this.
part = next(iter(stream))['message']['content']
temp = part.split("</think>", 1)

# Crash Here
temp[1]

PythonCore.zip

CPython versions tested on:

3.13

Operating systems tested on:

Linux

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

Python 3.13.2 (main, Feb 5 2025, 08:05:21) [GCC 14.2.1 20250128]

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    extension-modulesC modules in the Modules dirtype-crashA hard crash of the interpreter, possibly with a core dump

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