The following code causes Assertion failed on Windows 11 


import cProfile
def test():
    import sys
    import dis

with cProfile.Profile() as p:
    test()

Error:

❯ ./python.bat main.py 
Running Debug|x64 interpreter...
Assertion failed: frame->f_lasti >= 0, file D:\cpython\Python\ceval.c, line 6509

Tested commit is 7c770d3350813a82a639fcb3babae0de2b87aaae

I can reproduce this on linux.

The problem is that when closing a generator that has not started, the frame may not be in a valid state (hence the assertion failure).

This should be fixed by implementing https://github.com/faster-cpython/ideas/discussions/217 as that will ensure that the frame is in a valid state before the generator is created.

I'll make implementing https://github.com/faster-cpython/ideas/discussions/217 a priority in order to fix this.