[3.13] gdb py-bt does not work

[cielavenir]

Bug report

Bug description:

gdb ./python
r
Ctrl-C
py-bt

(gdb) py-bt
Traceback (most recent call first):
  (unable to read python frame information)
  <built-in method exec of module object at remote 0x7ffff7c39850>
  (unable to read python frame information)

3.13.3 is affected and 3.13.2 is not affected. (regression in point release, not good idea)

Also I bisected git and found 5646f6f . And reverting it onto 3.13.9 fixes py-bt:

(gdb) py-bt
Traceback (most recent call first):
  File "/home/user/devel/cpython/Lib/_pyrepl/unix_console.py", line 448, in wait
    or bool(self.pollob.poll(timeout))
  File "/home/usr/devel/cpython/Lib/_pyrepl/reader.py", line 705, in handle1
    self.console.wait(100)
  File "/home/user/devel/cpython/Lib/_pyrepl/reader.py", line 750, in readline
    self.handle1()
  File "/home/user/devel/cpython/Lib/_pyrepl/readline.py", line 390, in multiline_input
    return reader.readline()
  File "/home/user/devel/cpython/Lib/_pyrepl/simple_interact.py", line 146, in run_multiline_interactive_console
    statement = multiline_input(more_lines, ps1, ps2)
  File "/home/user/devel/cpython/Lib/_pyrepl/main.py", line 59, in interactive_console
    run_multiline_interactive_console(console)
  File "/home/user/devel/cpython/Lib/_pyrepl/__main__.py", line 10, in <module>
    __pyrepl_interactive_console()
  <built-in method exec of module object at remote 0x7ffff7c39850>
  File "<frozen runpy>", line 88, in _run_code
  File "<frozen runpy>", line 198, in _run_module_as_main

This can be confirmed by building https://github.com/cielavenir/cpython/commits/3.13.9-pybt .

However I don't know why "removing _PyReftracerTrack" fixes py-bt. Moreover, this commit does not affect py-bt on 3.14.

There is a similar report #127147 but this issue happens without --enable-optimizations.

Tested on Debian 13, GCC 14

---

The reason is unlikely the same as #142095 , so I separated the issue.

CPython versions tested on:

3.13

Operating systems tested on:

Linux

[StanFromIreland]

We do not need separate issues for each affected version.