Eric V. Smith added the comment:
The problem has to do with refcounting when an error occurs. Adjusting the
title accordingly.
I'm not sure yet if the problem is in PyObject_Format(), or in handling errors
in the eval loop when processing FORMAT_VALUE opcodes. I'm slowly tracking it
down. It doesn't happen with format(), so I suspect it's in FORMAT_VALUE.
Here's an example showing the error with a large, non-cached int. You need to
call it twice to trigger the refcount problem.
>>> f'{1000:j}'
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: Unknown format code 'j' for object of type 'int'
>>> f'{1000:j}'
Fatal Python error: Objects/tupleobject.c:233 object at 0x7f904006b360 has
negative ref count -2604246222170760230
Current thread 0x00007f9041278700 (most recent call first):
Aborted (core dumped)
----------
title: Core dump in f-string with lambda and format specification -> Core dump
in f-string with formatting errors due to refcount bug
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<http://bugs.python.org/issue26287>
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