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Exception with broken __getattr__ causes error rendering tracebacks #113358

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type-bugAn unexpected behavior, bug, or error
@perrinjerome

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@perrinjerome

Bug report

Bug description:

Running this code:

importloggingclassX(Exception):def__getattr__(self,a):raiseKeyError(a)# !!!try:raiseX()exceptX:logging.getLogger().exception('')print('ok')

does not print "ok" but instead:

#python3.11 repro.py--- Logging error ---Traceback (most recent call last):  File "/workspaces/cpython/repro.py", line 8, in <module>    raise X()object address  : 0x7f3007c67e80object refcount : 2object type     : 0x7f3015bf0b20object type name: KeyErrorobject repr     : KeyError('__notes__')lost sys.stderr

CPython versions tested on:

3.11, CPython main branch

Operating systems tested on:

Linux

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    type-bugAn unexpected behavior, bug, or error

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