Bug report

atexit is throwing a SystemExit exception and printing its traceback even though the documentation says that should not be true for SystemExit.

If an exception is raised during execution of the exit handlers, a traceback is printed (unless SystemExit is raised) and the exception information is saved. After all exit handlers have had a chance to run, the last exception to be raised is re-raised.

I have identified that the issue is related to this PR: #23779 in which the exception flow was removed.

To reproduce:

Behavior with Python 3.6 up to 3.9:

$ docker run python:3.6 python -c "import atexit,sys;atexit.register(sys.exit)"; echo $?
0

With Python 3.10 and 3.11:

$ docker run python:3.10 python -c "import atexit,sys;atexit.register(sys.exit)"; echo $?
Exception ignored in atexit callback: <built-in function exit>
SystemExit: 
0

With a bit more code you can see the traceback:

import atexit
import sys

def exit():
    sys.exit()

atexit.register(exit)

Output:

$ python test.py
Exception ignored in atexit callback: <function exit at 0x1041c8040>
Traceback (most recent call last):
  File "[...]/test.py", line 8, in exit
    sys.exit()
SystemExit: 

Your environment

Locally:

CPython: 3.10.10
OS: macOS Ventura 13.2.1
Intel processor

On Docker:

Image: python:3.10

Let me know if I can be of assistance.