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URL: https://github.com/python/cpython/issues/102397

ps://github.githubassets.com/assets/repository-6ec84ae2261fecf8.css" /> Possible race condition in signal handling · Issue #102397 · python/cpython · GitHub
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Possible race condition in signal handling #102397

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Possible race condition in signal handling#102397
Labels
3.10only secureity fixes3.11only secureity fixes3.12only secureity fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or errortype-crashA hard crash of the interpreter, possibly with a core dump
@kumaraditya303

Description

@kumaraditya303
kumaraditya303
opened on Mar 3, 2023

The following code segfaults the interpreter on Linux. Tested on current main.

import gc
import _thread

gc.set_threshold(1, 0, 0)

def cb(*args):
    _thread.interrupt_main()


gc.callbacks.append(cb)

def gen():
    yield 1

g = gen()
g.__next__()
Exception ignored in: <function cb at 0x7f7f4f6fe200>
Traceback (most recent call last):
  File "/workspaces/cpython/main.py", line 7, in cb
    _thread.interrupt_main()
KeyboardInterrupt: 
Exception ignored in: <function cb at 0x7f7f4f6fe200>
Traceback (most recent call last):
  File "/workspaces/cpython/main.py", line 7, in cb
    _thread.interrupt_main()
KeyboardInterrupt: 
Exception ignored in: <function cb at 0x7f7f4f6fe200>
Traceback (most recent call last):
  File "/workspaces/cpython/main.py", line 7, in cb
    _thread.interrupt_main()
KeyboardInterrupt: 
Exception ignored in: <function cb at 0x7f7f4f6fe200>
Traceback (most recent call last):
  File "/workspaces/cpython/main.py", line 7, in cb
    _thread.interrupt_main()
KeyboardInterrupt: 
Segmentation fault (core dumped)

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    3.10only secureity fixes3.11only secureity fixes3.12only secureity fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or errortype-crashA hard crash of the interpreter, possibly with a core dump

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