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Exception with broken __getattr__ causes error rendering tracebacks #113358

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@perrinjerome

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@perrinjerome

Bug report

Bug description:

Running this code:

import logging

class X(Exception):
    def __getattr__(self, a):
        raise KeyError(a)  # !!!

try:
    raise X()
except X:
    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  : 0x7f3007c67e80
object refcount : 2
object type     : 0x7f3015bf0b20
object type name: KeyError
object repr     : KeyError('__notes__')
lost sys.stderr

CPython versions tested on:

3.11, CPython main branch

Operating systems tested on:

Linux

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