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AssertionError when running profile on code containing generator expression #110514

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@chgnrdv

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@chgnrdv
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Bug report

Bug description:

Bisected to 411b169.

Minimal repro (save it to file and run as python -m profile script.py):

next(i for i in range(10))

Output:

Exception ignored in: <generator object <genexpr> at 0x7f48fac29010>
Traceback (most recent call last):
  File "/home/radislav/projects/cpython/Lib/profile.py", line 209, in trace_dispatch_i
    if self.dispatch[event](self, frame, t):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/radislav/projects/cpython/Lib/profile.py", line 293, in trace_dispatch_return
    assert frame is self.cur[-2].f_back, ("Bad return", self.cur[-3])
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: ('Bad return', ('script.py', 1, '<module>'))
         5 function calls in 0.114 seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.000    0.000    0.114    0.114 :0(exec)
        1    0.000    0.000    0.000    0.000 :0(next)
        1    0.000    0.000    0.114    0.114 profile:0(<code object <module> at 0x7f48faba08c0, file "script.py", line 1>)
        0    0.000             0.000          profile:0(profiler)
        1    0.000    0.000    0.000    0.000 script.py:1(<genexpr>)
        1    0.114    0.114    0.114    0.114 script.py:1(<module>)

CPython versions tested on:

3.12, CPython main branch

Operating systems tested on:

Linux

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3.12only security fixesonly security fixes3.13bugs and security fixesbugs and security fixestype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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